Eastern Mojave Vegetation Coll. No. 2202, Bidens frondosa  
 

 

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If you have a question or a comment about this photograph you may write to me at: tomas@schweich.com I sometimes post interesting questions in my FAQ, but I never disclose your full name or address. 		  Asteraceae Bidens frondosa
Photographed 4 February 2020.

Plants of Jefferson County Open Space
Jefferson County, Colorado
Asteraceae

Bidens frondosa L.  Devil's Beggartick.

Ranson/Edwards Homestead Open Space Park, Jefferson County, Colorado. High plains above Rocky Flats, 19.4 km. north northwest of the GNIS location of Golden, 1.6 mi. west on CO Hwy 72 from CO Hwy 93, 0.9 mi. north on Plainview Road, then 290 m. west to a small reservoir. 39.8865°N, 105.2644°W. WGS 1984 Elev. 1956 m. Discoid composite; in delta gravel of small reservoir.

Collected by permit: Jefferson County Open Space, 2019, issued: Mar 1, 2019, to: Tom Schweich.

Tom Schweich 2202. 27-Aug-2019

Coll. No. 2202, 27 August 2019, characters observed: Herbs, 18-28 cm.; Leaves, basal, unknown, cauline, opposite, 50 mm. × 40 mm. wide, pinnately compound, leaflets, #3, 25 mm. × 12 mm. wide, margin, serrate; Inflorescence, head enclosed in an involucre, 5-6 mm. wide; Phyllaries, outer, #5, 12 mm. × 2 mm. wide, green, inner, many, 5.5 mm. × 2.5 mm. wide, brown, margin, scarious (similar to the paleae); Receptacle, paleate; Paleae, 5 mm. × 1.7 mm. wide, margin, scarious; Corolla, 1.5 mm., orange-yellow; Pappus, #2, barbed awns, 1.5 mm.; Achene, 2-5-2.8 mm. × 1.5 mm. wide, very flat, hairy.

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Date and time this page was prepared: 12/8/2024 2:15:46 PM