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Plant - spring
Mahan Park
John Kava
Yavapai County Native & Naturalized Plants

Erioneuron pilosum - hairy woollygrass

Synonyms: Tridens pilosus, Uralepis pilosa

Other Common Names: hairy tridens

Plant Form:Grass

Family: Poaceae

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Mahan Park John Kava
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Mahan Park John Kava
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Leaves close up

Mahan Park John Kava
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Mahan Park John Kava
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Mahan Park John Kava
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Seedhead with leaf

Mahan Park John Kava
  Grass Description -   Glossary of Grass Terminology

Origin: Native    Season: Warm
Habitat Description: Occasional on rocky slopes and in open oak and pinyon juniper woodlands and desert flats.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland
Elevation: 2500 - 5500 feet

Similar Species: Tridens muticus

General Description

Desc: Small bunchgrass with tufted basal leaves. Seedhead stems 4 to 12 inches tall, smooth without hairs or minutely with rather long stiff hairs.
Identification notes: Short, weak-rooted perennial grass with basal tufts of short leaves; seedhead stems erect, nearly leafless, emerging from the basal tufts, topped with 3 to 10 short, densely hairy, purplish to straw colored spikelets. Smaller than Tridens muticus.
Grass Type: Perennial bunchgrass  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: Less than 12 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: May - Jul

Flower Characteristics

Number of Flowers per Spikelet: Multi-flowered  Spikelets One-sided: N
Awns: Less than 1/4 inch   Three Awns: N  Awns Bent: N

Flower and Seedhead Notes: Seedheads 3/4 to 2 inches long. Spikelets 1/2 to 3/4 inch long with 7 to 18 closely spaced very hairy florets.

Vegetative Characteristics

Blade Hairy: Y  Blade with White Margin: Y  Blade Cross Section: Flat or folded  
Blade Notes: Blades 1 to 2-1/4 inches long, less than 1/8 inch wide, both surfaces sparsely soft-hairy or smooth without hairs, grayish-green.
Sheath Hairy: N  Tuft of Hairs Top of Sheath or Collar: N  Ligules: Membranous
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Ligules 1/16 to 1/8 inch.

Forage Value: Fair.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
Last Updated: Feb 16, 2020  
Content Questions/Comments: Email Jeff Schalau  
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