[Sieglingia acuminata (Benth. ex Vasey) Kuntze, moreSieglingia pilosa (Buckley) Nash, Tricuspis acuminata Munro ex A. Gray, Tricuspis pilosa (Buckley) A. Heller, Tridens pilosus (Buckley) A. S. Hitchc., Triodia acuminata Benth. ex Vasey, Uralepis pilosa Buckley]
Culms (6)10-30(40) cm tall, (0.3)0.6-1(2.5) mm thick, glabrous or hispidulous.
Ligules 2-3.5 mm; blades (1)3-6(9) cm long, (0.5)1-1.5(2.5) mm wide,
both surfaces sparsely pilose or glabrous, grayish-green. Panicles 1-4(6)
cm; branches with 3-9 shortly pedicellate spikelets. Spikelets 6-12(15)
mm, with (5)6-12(20) florets. Glumes exceeded by the lowest florets, pale;
lower glumes 4-7 mm; upper glumes 4-7 mm; lemmas 3-6 mm,
green or purplish-green when young, becoming stramineous at maturity, awned, awns
0.5-2.5 mm, apices acute, entire or bidentate, teeth 0.3-0.5 mm; anthers
usually 3, 0.3-1 mm. Caryopses 1-1.5 mm. 2n = 16.
FNA 2003, Gould 1980
Common Name: hairy woollygrass Duration: Perennial Nativity: Native Lifeform: Graminoid General: Weakly-rooted perennial grass, with low basal tufts of leaves and tall, erect, nearly leafless stems emerging from the basal tufts and topped with short, dense contracted panicles. Stems 10-30 cm tall, 0.5-1 mm thick, glabrous to hispidulous, usualy with a single cauline leaf. Vegetative: Blades 3-6 cm long, 1-2 mm wide, flat or folded, often short and thinly pilose; ligules 2-3.5 mm. Inflorescence: Contracted panicles or racemes 1-4 cm long, with 3-9 shortly pedicellate spikelets; spikelets 6-12 mm with 6-12 closely imbricate florets, the distal florets staminate or sterile; disarticulating above the glumes and between the florets; glumes pale in color, subequal, and exceeded by lowest florets, 4-7 mm; calluses with tufts of hairs; lemmas 5-6 mm long, ciliate-pubescent on the nerves near the base, green purplish when young, becoming straw colored at maturity, short-awned, the awns to 2.5 mm. Ecology: Found on dry, often rocky slopes and flats, often in open oak and juniper woodlands, from 2,500-5,500 ft (762-1676 m); flowers May-July. Distribution: sw US, from se CA and NV east through AZ, UT, NM and CO to w TX, w OK, and w KS. Notes: Look for low clusters of grass blades with tall naked flowering stalks topped with closely imbricate, (overlapping) short-awned spikelets. Tufts of hairs at the base of each floret are visible on close examination, the trait that gives this genus its common name, wolly grass. Ethnobotany: Unknown Etymology: Erioneuron is form Greek erion, wool and neuron, nerve, meaning woolly-nerved, while pilosum means woolly or hairy. Synonyms: Tridens pilosus, Uralepis pilosa Editor: SBuckley 2010, AHazelton 2015