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Achnatherum

Achnatherum
Family: Poaceae
Achnatherum image
© Steven J. Baskauf
  • FNA
  • Resources
Mary E. Barkworth. Flora of North America
Plants perennial; tightly to loosely cespitose, sometimes shortly rhizomatous. Culms 10-250 cm, erect, not branching at the upper nodes; basal branching extra- or intravaginal; prophylls shorter than the sheaths. Leaves sometimes concentrated at the base; sheaths open, margins often ciliate distally; cleistogenes not present in the basal leaf sheaths; collars sometimes with hairs on the sides; auricles absent; ligules hyaline to membranous, glabrous or pubescent, sometimes ciliate; blades flat, convolute, or involute, apices acute, flexible, basal blades not overwintering, flag leaf blades more than 10 mm long. Inflorescences terminal panicles, usually contracted, sometimes 2 forming at the terminal node; branches usually straight, sometimes flexuous. Spikelets usually appressed to the branches, with 1 floret; rachillas not prolonged beyond the floret; disarticulation above the glumes, beneath the floret. Glumes exceeding the floret, usually lanceolate, 1-7-veined, acute to acuminate, sometimes obtuse; florets usually terete, fusiform or globose, sometimes somewhat laterally compressed; calluses 0.1-4 mm, blunt to sharp, usually strigose; lemmas stiffly membranous to coriaceous, smooth, usually hairy, sometimes glabrous, hairs on the lemma body to 6 mm, usually evenly distributed, hairs on the upper 1/4 sometimes somewhat longer than those below, not both markedly longer and more divergent, apical hairs to 7 mm, lemma margins usually not or only weakly overlapping, firmly overlapping in some species with glabrous lemmas, usually terminating in 0.05-3 mm lobes, sometimes unlobed, lobes usually membranous and flexible, sometimes thick, apices with a single, terminal, centric awn, awn-lemma junction evident; awns 3-80 mm, centric, readily deciduous to persistent, usually scabrous to scabridulous, sometimes hairy in whole or in part, if shorter than 12 mm, usually deciduous, not or once-geniculate and scarcely twisted, if longer than 12 mm, usually persistent, once- or twice-geniculate and twisted below, terminal segment usually straight, sometimes flexuous; paleas from 1/3 as long as to slightly longer than the lemmas, usually pubescent, 2-veined, not keeled over the veins, flat between the veins, veins usually terminating below the apices, sometimes prolonged 1-3 mm, apices usually rounded; lodicules 2 or 3, membranous, not lobed; anthers 3, 1.5-6 mm, sometimes penicillate; ovaries with 2 style branches, branches fused at the base. Caryopses fusiform, not ribbed, style bases persistent; hila linear, almost as long as the caryopses; embryos 1/5-1/3 the length of the caryopses. x = 10 or 11. Name from the Greek achne, 'scale', and ather, 'awn', a reference to the awned lemma.
Species within checklist: Sonoran Desert Field Botany (ASU) Spring 2021
Achnatherum brachychaetum
Media resource of Achnatherum brachychaetum
Map not
Available
Achnatherum bromoides
Media resource of Achnatherum bromoides
Map not
Available
Achnatherum calamagrostis
Media resource of Achnatherum calamagrostis
Map not
Available
Achnatherum caudatum
Media
not available
Map not
Available
Achnatherum clandestinum
Media resource of Achnatherum clandestinum
Map not
Available
Achnatherum contractum
Media resource of Achnatherum contractum
Map not
Available
Achnatherum coronatum
Media resource of Achnatherum coronatum
Map not
Available
Achnatherum curvifolium
Media resource of Achnatherum curvifolium
Map not
Available
Achnatherum diegoense
Media resource of Achnatherum diegoense
Map not
Available
Achnatherum editorum
Media resource of Achnatherum editorum
Map not
Available
Achnatherum eminens
Media resource of Achnatherum eminens
Map not
Available
Achnatherum jacquemontii
Media resource of Achnatherum jacquemontii
Map not
Available
Achnatherum latiglume
Media resource of Achnatherum latiglume
Map not
Available
Achnatherum lemmonii
Media resource of Achnatherum lemmonii
Map not
Available
Achnatherum lettermanii
Media resource of Achnatherum lettermanii
Map not
Available
Achnatherum lobatum
Media resource of Achnatherum lobatum
Map not
Available
Achnatherum miliaceum
Media resource of Achnatherum miliaceum
Map not
Available
Achnatherum multinode
Media resource of Achnatherum multinode
Map not
Available
Achnatherum nelsonii
Media resource of Achnatherum nelsonii
Map not
Available
Achnatherum nevadense
Media resource of Achnatherum nevadense
Map not
Available
Achnatherum occidentale
Media resource of Achnatherum occidentale
Map not
Available
Achnatherum papposum
Media
not available
Map not
Available
Achnatherum paradoxum
Media
not available
Map not
Available
Achnatherum parishii
Media resource of Achnatherum parishii
Map not
Available
Achnatherum pekinense
Media resource of Achnatherum pekinense
Map not
Available
Achnatherum perplexum
Media resource of Achnatherum perplexum
Map not
Available
Achnatherum pinetorum
Media resource of Achnatherum pinetorum
Map not
Available
Achnatherum richardsonii
Media resource of Achnatherum richardsonii
Map not
Available
Achnatherum robustum
Media resource of Achnatherum robustum
Map not
Available
Achnatherum scribneri
Media resource of Achnatherum scribneri
Map not
Available
Achnatherum sibiricum
Media resource of Achnatherum sibiricum
Map not
Available
Achnatherum splendens
Media resource of Achnatherum splendens
Map not
Available
Achnatherum stillmanii
Media resource of Achnatherum stillmanii
Map not
Available
Achnatherum swallenii
Media resource of Achnatherum swallenii
Map not
Available
Achnatherum thurberianum
Media resource of Achnatherum thurberianum
Map not
Available
Achnatherum virescens
Media
not available
Map not
Available
Achnatherum wallowaense
Media resource of Achnatherum wallowaense
Map not
Available
Achnatherum wallowaensis
Media resource of Achnatherum wallowaensis
Map not
Available
Achnatherum webberi
Media resource of Achnatherum webberi
Map not
Available
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