Eastern Mojave Vegetation Coll. No. 3079, Piptatherum micranthum.  


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  Poaceae Piptatherum micranthum
Photographed 31 December 2023.

Plants of the Douglas Mountain Study Area
Jefferson County Open Space, Colorado, USA

Piptatherum micranthum (Trin. & Rupr.) Barkworth.  Littleseed Ricegrass.

Guy Gulch, Jefferson County, Colorado. Dry former roadside in the shaded mouth of a small gulch tributary to Guy Gulch, 190 m. southwest across County Road 70 from the Centennial Ranch house, 2.56 km. south of Mount Tom, 12.3 km. west northwest of the GNIS location of Golden. 39.7936N, 105.3556W. WGS 1984 Elev. 2353 m.

Collected by permit: Jefferson County Open Space, 2023, issued: Apr 10, 2023, to: Tom Schweich.

Tom Schweich, with Cindy Trujillo and John Vickery 3079. 12-Jul-2023

Coll. No. 3079, 12 July 2023, characters observed: Perennial grass, to 50 cm., caespitose; Leaves, sheath, 75 mm., open, ligule, membranous, 1.5 mm., blade, 250 mm. × 3.2 mm. wide, some flat, some involute; Inflorescence, 1 per culm, <leaves, panicle, contracted [more so than would be expected], 120 mm. × 5 mm. wide; Rachis, not extended; Compression, not remarkable; Glumes, lower, 3.2 mm., veins, 5(7?), upper, 3.5 mm. >lowest floret, veins, 5(7?), membranous to transparent distally, awns, 0; Florets, 1 per spikelet; Lemma, 2.2 mm., <glumes, coriaceous, rolled, sparsely pubescent, veins, 3, awns, #1, 9 mm., wavy, deciduous; Palea, 2 mm., <lemma, coriaceous.

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Date and time this page was prepared: 4/14/2024 5:46:35 PM