UW Burke Herbarium species comparison

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Achnatherum diegoense

Achnatherum hymenoides

Indian rice grass
Habit Strongly tufted perennial 3-6 dm. tall, the culms thick-walled, but hollow.
Leaves

Sheaths open, glabrous to puberulent;

ligules about 6 mm. long, entire to lacerate, acuminate;

blades elongate, strongly involute, about 1 mm. wide.
Flowers

Inflorescence an open panicle 8-16 cm. long, the branches spreading and dichotomously branched, the pedicles filiform;

spikelets 1-flowered, articulate above the glumes;

glumes ovate-acuminate, 3-nerved, subglabrous, 5-9 mm. long, subequal;

lemmas dark, 3-4 mm. long, copiously hairy, with a stout awn 4-6 mm. long;

stamens 3, the anthers with a tuft of hair at the tip;

lodicules 3, 2 mm. long, two broadly wedge-shaped, the third rhombic.
Fruits

Utricle

Achnatherum diegoense

Achnatherum hymenoides
Flowering time May-June
Habitat Grasslands, desert plains, and foothills, especially on rocky or sandy soil.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
A. hendersonii, A. hymenoides, A. lemmonii, A. nelsonii, A. nevadense, A. occidentale, A. richardsonii, A. thurberianum
A. hendersonii, A. lemmonii, A. nelsonii, A. nevadense, A. occidentale, A. richardsonii, A. thurberianum
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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Choose a data source: Flora of North America, OregonFlora, UW Burke Herbarium

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