Eastern Mojave Vegetation Field Notes (Continued)  
 

Tom Schweich  

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Literature Cited
 When I first read the field notes of Annie Alexander and Louise Kellogg, I was fascinated by the descriptions they wrote about the places they went and the plants and animals they found there. By publishing my field notes on the Internet I hope to follow a little bit in their tradition.

 

   

July, 2017

 

 

   

Friday, July 7th

 
  Ranson/Edwards Homestead Open Space, as a pre-walk for my field trip tomorrow.
  1698  Field identification: Nassella viridula

Nassella viridula (Trin.) Barkworth. Green Needlegrass.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 1.3 miles north on Plainview Road, then 60 meters east. 39.8908N, 105.2612W. WGS 1984 Elev. 1900 m. On an old ranch road that heads in the direction of the original homestead.

Coll. No. 1698, 7 July 2017: Perennial, to 70 cm., clumped, non-rhizomatous; Stem, herbaceous; Inflorescence, 25 cm., 1 per culm, panicle; Rachis, lightly scabrous, not extended beyond upper spikelet; Compression, unremarkable; Spikelets, 1 per node; Florets, 1 per spikelet, bisexual; Glumes, both present, upper 8 mm., lower 9 mm., rounded, membraneous, veins, #3; Callus, short; Lemma, 5 mm., <glumes, tough, hairy, <1 mm., awns, #1, 25 mm., bent, short hairy (±0.2 mm.) Palea, 1.5 mm., <lemma, membraneous, glabrous; Stamens, #3.

Other articles: Plainview Road near coll loc west
Full Size ImageColl. No. 1699, Elymus canadensis  

1699  Field identification: Elymus canadensis.

Elymus canadensis L. Canadian Wildrye.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 1.2 miles north on Plainview Road, west side of road. 39.8897N, 105.262W. WGS 1984 Elev. 1935 m. Non-rhizomatous. Gravelly stream terrace.

Coll. No. 1699, 7 Jul 2017, characters observed: Perennial grass, to 75 cm., non-rhizomatous; Culm, cauline nodes hidden by sheath; Inflorescence, 200 mm. × 15 mm. wide, ±erect to curved; Rachis, mostly glabrous, internodes, 5 mm.; Spikelets, 2 per node, sessile; Glumes, #2, 21-24 mm., indistinct body 8 mm + awn 14 mm., nearly subulate, flattened and slightly broadened above base; Lemma, body 10 mm. + awn 35 mm., curving.


Full Size ImageColl. No. 1700, Ceanothus fendleri  
1700  Field identification: Rhamnaceae, maybe Ceanothus fendleri.

Ceanothus fendleri A. Gray. Fendler's Ceanothus.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 2.2 miles north on Plainview Road, then 250 m. west northwest into the northwest corner of Ranson/Edwards Homestead OS. 39.8973N, 105.2754W. WGS 1984 Elev. 2024 m. Somewhat sheltered little draw near base of a hogback.

 

   

Friday, July 14th

 

Locations: North Washington Open Space.  

North Washington Open Space.
  1701  Field identification: Cirsium arvense.

Cirsium arvense (L.) Scop. Canada Thistle.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue, 1.75 km. northwest of the GNIS location of Golden. 39.7687N, 105.2317W. WGS 1984 Elev. 1766 m. East end of parcel amid a dense infestation of smooth brome.

  1702  Field identification: Ratibida columnifera.

Ratibida columnifera (Nutt.) Woot. & Standl. Upright Prairie Coneflower.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue, 1.75 km. northwest of the GNIS location of Golden. 39.7686N, 105.2317W. WGS 1984 Elev. 1789 m. Base becoming woody. Southeast corner of parcel, between social trails.

  1703  Field identification: Pediomelum tenuiflorum.

Psoralidium tenuiflorum (Pursh) Rydb. Slimflower Scurfpea.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue, 1.75 km. northwest of the GNIS location of Golden. 39.7684N, 105.2322W. WGS 1984 Elev. 1799 m. Southeast edge, in the approximate location of the city water line.


Full Size ImageColl. No. 1704, Helianthus pumilus  
1704  Field identification: Helianthus pumila.

Helianthus pumilus Nutt. Little Sunflower.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue, 1.75 km. northwest of the GNIS location of Golden. 39.7686N, 105.2326W. WGS 1984 Elev. 1811 m. East-facing slope near center of parcel.

Coll. No. 1704, 14 Jul 2017, characters observed: Perennial herb, to 40 cm.; Leaves, cauline, alternate, occasionally opposite, then bases conjoined, petiole 10 mm. + blade 55 mm. × 22 mm. wide, lanceolate, flat (not folded), margin, entire to lightly toothed, pustular multicellular white strigose, glandular; Inflorescence, single to few heads on peduncles to 100 mm.; Involucre, 9 mm. × 16 mm. wide; Phyllaries, in 2+ series, 8 mm. × 4 mm wide, green, abaxial strigose; Receptacle, paleate, flat to hemispheric; Rays, 20 mm. × 3.3 mm. wide, yellow, sterile; Disk, tube 4 mm. + lobes 1 mm., yellow; Pappus, scales, to 4 mm.; Cypsela, 3.5 mm. × 1.4 mm. wide, quadrangular, black.


Full Size ImageColl. No. 1705, Lonicera tatarica  
1705  Field identification: Horticultural Caprifoliaceae, same as Coll. No. 1591.

Full Size ImageColl. No. 1706, Parthenocissus vitacea  
1706  Field identification: Parthenocissus vitacea.

Parthenocissus vitacea (Knerr) Hitchcock. Woodbine, thicket creeper.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Hughway 93 and Washington Avenue. Several plants near the east end of the parcel, close to North Ford Street. 39.7688N, 105.2326W. WGS 1984 Elev. 1808 m. Tendrils without adhesive pads.


Full Size ImageColl. No. 1707, Thelesperma megapotamicum  
1707  Field identification: Thelesperma megapotamicum.

Thelesperma megapotamicum (Spreng.) Kuntze. Hopi Tea Greenthread.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. Center of parcel, top of hill. 39.7685N, 105.2326W. WGS 1984 Elev. 1814 m.

  1708  Field identification: Eriogonum arcuatum.

Eriogonum arcuatum Greene. Baker's Buckwheat.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. Center of parcel, top of hill. 39.7686N, 105.233W. WGS 1984 Elev. 1818 m.


Full Size ImageColl. No. 1709, Thinopyrum intermedium  
1709  Field identification:Thinopyrum intermedium.

Thinopyrum intermedium (Host) Barkworth & D.R. Dewey. Intermediate Wheatgrass.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. North central part of parcel, just off the top of the hill. 39.7687N, 105.233W. WGS 1984 Elev. 1815 m. Rhizomatous.

Other articles: Golden Checklist Flora Gypsophila paniculata Field Notes Coll. No. 1666, 16 Jun 2017
Full Size ImageColl. No. 1710, Gypsophila paniculata  

1710  Field identification: Gypsophila paniculata.

Gypsophila paniculata L. Baby's Breath.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. Northwest central part of parcel, off the top of the hill, getting close to the neighbors' fences. 39.7688N, 105.2334W. WGS 1984 Elev. 1816 m. Colorado Noxious Weed Watch List.

Other articles: Golden Checklist Flora Carduus nutans
Full Size ImageColl. No. 1711, Carduus nutans  

1711  Field identification: Carduus nutans.

Carduus nutans L. Nodding Plumeless Thistle.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. Southwestern slope, probably in the revegetated zone. 39.7684N, 105.2337W. WGS 1984 Elev. 1811 m. Colorado Noxious Weed List B.

  1712 

Native and Naturalized Flora of the Golden Area, Jefferson County, Colorado
Asteraceae

Symphyotrichum falcatum (Lindl.) G.L. Nesom.  White Prairie Aster.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. Mid-slope in southwestern section, probably not in the revegetated zone. 39.7683N, 105.2334W. WGS 1984 Elev. 1810 m. See also my Coll. No. 1760.

Collected by permit: City of Golden, 2017, issued: Feb 6, 2017, to: Tom Schweich.

Tom Schweich 1712. 14-Jul-2017


Field identification: Symphyotrichum sp.

 

   

Friday, July 28th

 

Other articles: Plainview Road at old ranch rd

Locations: Ranson/Edwards Homestead Open Space Park.  

Ranson/Edwards Homestead Open Space.
  1713  Field identification: Grass, multiple infl. per culm, spikelets tightly appressed, Aegilops cylindrica ???

Schizachyrium scoparium (Michx.) Nash. Little Bluestem.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 120 meters west into open prairie. 39.8847N, 105.2638W. WGS 1984 Elev. 1950 m. When immature, appressed spikelets of multiple inflorescenses per culm look similar to Aegilops cylindrica.

Other articles: Plainview Road at old ranch rd
Full Size ImageColl. No. 1714, Sporobolus heterolepis  

1714  Field identification: Sporobolus heterolepis.

Sporobolus heterolepis (A. Gray) A. Gray. Prairie Drop-seed.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 120 meters west into open prairie. 39.8847N, 105.2638W. WGS 1984 Elev. 1954 m. Within an arm's length of Coll. No. 1713, Schizachyrium scoparium. Collected a little early in the season for this C4, warm season grass.

Coll. No. 1714, 28 July 2017, characters observed: Perennial grass, to 40 cm., caespitose; Leaves, mostly basal, ≥inflorescence; Inflorescence, (immature) 10 cm. × 2 cm. wide, open panicle; Spikelets, 1 per node, 4-5 mm.; Florets, 1 per spikelet; Glumes, #2, awns 0, lower, 4 mm., <lemma, upper, 5 mm., ≥lemma; Lemma, 4 mm., veins 1, awn 0.

Other articles: Plainview Road at old ranch rd
Full Size ImageComparison of involucres of two taxa of Helianthus  

1715  Field identification: Sunflower, Helianthus? long, stiff, coarse hairs.

Helianthus pumilus Nutt. Little Sunflower.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 360 meters west into open prairie. 39.8854N, 105.2664W. WGS 1984 Elev. 1976 m. Sunflower, long coarse hairs, a few disc flowers have reddish lobes.

  1716  Field identification: Stiff Sunflower, Helianthus pauciflorus var. subrhiomboideus.

Helianthus pauciflorus Nutt. ssp. subrhomboideus (Rydb.) O. Spring & E. Schilling. Stiff Sunflower.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 385 meters west into open prairie. 39.8853N, 105.2667W. WGS 1984 Elev. 1978 m.

Other articles: Plainview Road at old ranch rd
Full Size ImageColl. No. 1717, Elymus elymoides  

1717  Field identification: Grass, Squirrel Tail(?)

Elymus elymoides (Raf.) Swezey. Squirreltail Grass.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 395 meters west into open prairie. 39.8853N, 105.2669W. WGS 1984 Elev. 1984 m.

Coll. No. 1717, 28 July 2017, characters observed: Perennial grass to 50 cm., clumped; Inflorescence, bilateral spike; Rachis, internodes, 6.4 mm., breaking apart when mature; Spikelets, 2 per node; Glumes, #2, subulate, 62-65 mm.; Florets, #3, lowest 2 fertile, upper sterile; Lemma, 10 mm. + awn 50 mm., veins, #5, converging; Palea, 9 mm., 1 of 2 veins slightly extended as bristle. Variety brevifolius if infraspecific names are to be applied.


Full Size ImageColl. No. 1718, Polygonum douglasii
Full Size ImageColl. No. 1718, Polygonum douglasii  
1718  Field identification: Epilobium or Gaytophytum --- Nope, definitely not those

Polygonum douglasii Greene. Douglas Knotweed.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 500 meters west into open prairie. 39.8857N, 105.268W. WGS 1984 Elev. 1994 m. At base of Prunus virginiana with Symphoricarpos and Potentilla recta.

Coll. No. 1718, 28 Jul 2017, characters observed: Annual, to 35-40 cm., generally glabrous; Leaves, cauline, alternate, some sort of papery tissue at base of leaf that could be an ocrea, 20 mm. × 1 mm. wide, linear to narrowly lanceolate, adaxial sparsely pitted, margins revolute; Inflorescence, flowers borne singly in axils; Flowers, stipe-like base; Perianth, 2 series of 3, 2.5 mm. × 1 mm. wide, outer, greenish with pink margins, inner, pink with green mid-vein; Stamens, #6, 1.4 mm.; Filaments, winged below; Ovary, superior, 1 mm. × 0.6 mm. wide; Styles, #3, 0.3 mm.; Stigmas, 1 per style; Fruit, 2.5 mm., black.

FNANM treat P. douglasii and P. majus as distinct while noting that P. majus is sometimes treated as a synonym of P. douglasii. Reading the descriptions of both, I lean toward P. majus for this collection. However, Ackerfield (2015) does not list P. majus for Colorado. Nearly all collections for Colorado are determined as P. douglasii, except for two Hall and Harbour collections at F. Weber & Wittmann (2012) explicitly list P. majus as a synonym for P. douglasii. For this collection, I will use P. douglasii, file it at JCOS and KHD, and then let the “Polygonistas” (or is it “Polygonarians?”) sort it out.

  1719  Field identification: Oenothera elata.

Oenothera villosa Thunb. Hairy Evening Primrose.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 865 meters west into open prairie, nearly to the railroad tracks. 39.8869N, 105.2719W. WGS 1984 Elev. 2035 m. with Asclepias speciosa, Rosa arkansana, Solidago, and Phleum. Probably var. strigosa if infra-specific names are to be applied.

  1720  Field indentifcation: Eriogonum arcuatum.

Eriogonum arcuatum Greene. Baker's Buckwheat.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 915 meters a little north of west into open prairie, nearly to the railroad tracks. 39.8877N, 105.2723W. WGS 1984 Elev. 2035 m. Rocky elevated bench.

  1721  Field identification: Lycopus americanus.

Lycopus americanus W. P. C. Barton. American Bugleweed.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 655 meters a little north of west along a small ephemeral stream. 39.8869N, 105.2694W. WGS 1984 Elev. 2005 m. Streamside.


Full Size ImageColl. No 1721.1, Galium boreale
Full Size ImageMature Inflorescence of Coll. No 1721.1, Galium boreale  
1721.1  Mixed up my count. Wrote that Coll. No. 1723 was Galium boreale in my field notes, then discovered that Coll. No. 1723 was something else.

Galium boreale S. Watson. Bedstraw.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 610 meters a little north of west along a small ephemeral stream. 39.8868N, 105.2689W. WGS 1984 Elev. 1997 m.

  1722  Field identification: Mentha arvensis.

Mentha arvensis L. Wild Mint.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 610 meters a little north of west along a small ephemeral stream. 39.8867N, 105.2688W. WGS 1984 Elev. 1997 m.


Full Size ImageColl. No. 1723, Lysimachia ciliata  
1723  Field identification: Galium, with a stiff stem. -- Nope, the Galium turned out to be Coll. No. 1721.1.

Lysimachia ciliata L. Fringed Loosestrife.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 610 meters a little north of west along a small ephemeral stream. 39.8868N, 105.2689W. WGS 1984 Elev. 2003 m. In the bank of a small stream.

Coll. No. 1723, 28 Jul 2018, characters observed: Perennial herb, to 40 cm.; Leaves, cauline, opposite, petiole, 12 mm., sparsely long ciliate, blade, 72 mm. × 26 mm. wide, lanceolate, glabrous, margin minutely ciliate; Inflorescence, axillary, flowers borne singly on long pedicels; Pedicel, 30 mm.; Sepals, #5, 4 mm.; Petals, #5, 7 mm. × 6 mm. wide, free ≥½length, yellow; Stamens, #5, alternate; Filaments, 2 mm., attached near base; Anthers, 2 mm.; Ovary, superior; Style, #1, 3 mm., lengthening to 4 mm. at maturity; Fruit, 3 mm. × 3 mm. dia., globose, bluish.

  1724  Field identification: Ranunculus, maybe R. macounii.

Ranunculus pensylvanicus L. f. Pennsylvania Buttercup.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 555 meters a little north of west along a small ephemeral stream. 39.8867N, 105.2682W. WGS 1984 Elev. 1990 m. In the bottom on an ephemeral stream.

Coll. No. 1723, 28 Jul 2018, characters observed: Perennial herb, to 40 cm.; Leaves, cauline, opposite, petiole, 12 mm., sparsely long ciliate, blade, 72 mm. × 26 mm. wide, lanceolate, glabrous, margin minutely ciliate; Inflorescence, axillary, flowers borne singly on long pedicels; Pedicel, 30 mm.; Sepals, #5, 4 mm.; Petals, #5, 7 mm. × 6 mm. wide, free ≥½length, yellow; Stamens, #5, alternate; Filaments, 2 mm., attached near base; Anthers, 2 mm.; Ovary, superior; Style, #1, 3 mm., lengthening to 4 mm. at maturity; Fruit, 3 mm. × 3 mm. dia., globose, bluish.

  1725  Field identification: Geranium caespitosum.

Geranium caespitosum James. Pineywoods Geranium.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 555 meters a little north of west along a small ephemeral stream. 39.8867N, 105.2682W. WGS 1984 Elev. 1993 m. Basal leaves withered, very red stem. On the bank of a small ephemeral stream (that was running on this particular day).

  1726  Field identification: Schoenoplectus, maybe S. acutus.

Scirpus pallidus (Britt.) Fern. Cloaked Bulrush.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 360 meters northwest to a small ephemeral stream. 39.8866N, 105.2655W. WGS 1984 Elev. 1868 m.


Full Size ImageColl. No. 1727, Alisma trivale  
1727  Field identification: Alisma triviale, based upon a similar collection across the highway at Rocky Flats.

Alisma triviale Pursh. Northern Water Plantain.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 280 meters northwest to a small reservoir on an ephemeral stream. 39.8865N, 105.2644W. WGS 1984 Elev. 1958 m.


Full Size ImageColl. No. 1728, Eleocharis palustris  
1728  Field identification: Eleocharis sp.

Eleocharis palustris (L.) Roem. & Schult. Common Spikerush.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 280 meters northwest to a small reservoir on an ephemeral stream. 39.8865N, 105.2644W. WGS 1984 Elev. 1958 m.


Full Size ImageColl. No. 1729, Gratiola neglecta  
1729  Field identification: Some kind of Scroph, maybe Gratiola neglecta.

Gratiola neglecta Torr. Clammy Hedge Hyssop.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 280 meters northwest to a small reservoir on an ephemeral stream. 39.8865N, 105.2644W. WGS 1984 Elev. 1950 m.


Full Size ImageColl. No. 1730, Persicaria pensylvanicum  
1730  Field identification: Some kind of knotweed, quickly settling on Polygonum pennsylvanicum while looking at photos.

Persicaria pensylvanicum (L.) M. Gmez. Pennsylvania smartweed.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 1.7 miles west on Colorado Highway 72 from Colorado Highway 93, 0.8 miles north on Plainview Road, then 265 meters northwest to a small ephemeral stream below a reservoir. 39.8864N, 105.2642W. WGS 1984 Elev. 1955 m.

  1731  Field identification: definitely Mentzelia, maybe M. nuda.

Mentzelia nuda (Pursh) Torr. & A. Gray. Bractless Blazing Star.

North Washington Open Space, Jefferson County, Colorado. Small (4 acre) fallow city-owned parcel in northern Golden, near the intersection of Colorado Highway 93 and Washington Avenue. Top of Hill, center of parcel. 39.7685N, 105.233W. WGS 1984 Elev. 1810 m. Flowers mostly closed at 6:30 AM. Few plants here.

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Date and time this article was prepared: 11/9/2019 7:38:46 PM