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Strickland, Sam C.
Erioneuron pilosum (Buckley) Nash
Hairy Woollygrass, Hairy Tridens
Poaceae (Grass Family)
Synonym(s): Tridens pilosus, Uralepis pilosa
USDA Symbol: erpi5
USDA Native Status: L48 (N)
Blades: Thick, narrow, flat, glabrous, 2-8 cm. long, 1-2 mm broad. Thick white margin, pointed tip.
Culms: 10-30 cm. tall, typically with only 1 node elevated above the basal clusters of leaves.
Inflorescence: Contracted panicle or raceme mostly 2-3 cm. long and 10-16 cm broad with 4-9 large, pale spikelets.
Fruits: Caryopsis 1.3-1.5 mm. long.
Bloom InformationBloom Color: Brown
Bloom Time: Apr , May , Jun , Jul , Aug , Sep , Oct
, UT Native Distribution:
Abundant in far West Texas and the Edwards plateau on prairies and other disturbed areas. Native Habitat:
Well-drained limestone, sand, caliche in open rangelands, pastures, poor areas.
Growing ConditionsWater Use: Low
Light Requirement: Sun
Soil Moisture: Dry
Drought Tolerance: High
Heat Tolerant: yes
Soil Description: Limestone-based, Sandy Sandy Loam, Medium Loam, Clay Loam Clay
Conditions Comments: Hairy tridens conforms to a short-grass prairie garden. It provides a good matrix in which to establish wildflowers. Winecup, four-nerve daisy, and blue-eyed grass combine well in plantings with hairy tridens because the grass provides an interesting contrast with its texture.
BenefitUse Ornamental: Attractive.
Use Wildlife: Seeds-granivorous birds; Small mammals-nesting material; Poor forage plant for livestock and wildlife.
Use Other: Some value in retarding soil erosion in dry regions subject to occasional heavy rains.
Conspicuous Flowers: yes
Interesting Foliage: yes
Larval Host: The Grass Family is an essential larval food for most branded skippers and most of the satyrs.
Deer Resistant: High
PropagationPropagation Material: Seeds
Seed Treatment: No special pre-treatment.
Commercially Avail: yes
Herbarium Specimen(s)NPSOT 0951
Collected Sep 1, 1994 in Bexar County by Harry CliffeNPSOT 1056
Collected Aug 10, 1995 in Comal County by Mary Beth White
Wildflower Center Seed BankLBJWC-29
Collected 2006-05-16 in Travis County by Lady Bird Johnson Wildflower Center
Record Last Modified: 2013-08-01
Research By: TWC Staff