Difference between revisions of "Achnatherum wallowaense"

J.R. Maze & K.A. Robson
Common names: Wallowa needlegrass
Treatment appears in FNA Volume 24. Treatment on page 138.
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-->{{#Taxon:
 
-->{{#Taxon:
 
name=Achnatherum wallowaense
 
name=Achnatherum wallowaense
|author=
 
 
|authority=J.R. Maze & K.A. Robson
 
|authority=J.R. Maze & K.A. Robson
 
|rank=species
 
|rank=species
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|basionyms=
 
|basionyms=
 
|family=Poaceae
 
|family=Poaceae
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|illustrator=Cindy Roché
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|illustration copyright=Utah State University
 
|distribution=Oreg.
 
|distribution=Oreg.
 
|reference=None
 
|reference=None
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|publication year=
 
|publication year=
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V24/V24_185.xml
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V24/V24_185.xml
 
|subfamily=Poaceae subfam. Pooideae
 
|subfamily=Poaceae subfam. Pooideae
 
|tribe=Poaceae tribe Stipeae
 
|tribe=Poaceae tribe Stipeae

Latest revision as of 16:22, 11 May 2021

Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants tightly cespitose, not rhizomatous. Culms (10)15-40 (45) cm tall, 0.5-0.7 mm thick, glabrous; nodes 1-2. Basal sheaths becoming flat with age, glabrous; collars glabrous, including the sides; basal ligules 0.8-1.3 mm, membranous, truncate to broadly acute, glabrous; upper ligules to 1.6 mm; blades tightly valvate to involute, 0.5-0.8 mm in diameter, abaxial surfaces scabridulous, adaxial surfaces hairy, sometimes densely hairy, hairs shorter than 0.05 mm. Panicles (4)5-13(15) cm long, to 10 cm wide, lax; branches divergent, flexuous, longest branches 2-10 cm, with spikelets confined to the distal portions, drooping. Glumes obtuse to acute; lower glumes 3.5-7 mm long, 0.8-1.3 mm wide, 5(7)-veined; upper glumes 3-6.5 mm, 3-veined; florets 3-5.5 mm long, 1-1.5 mm thick, fusiform, terete; calluses 0.1-0.2 mm, blunt; lemmas coriaceous, shiny, glabrous, black to dark brown at maturity, margins overlapping at maturity, apices thickened dorsally; awns 5-11 mm, readily deciduous, not or weakly geniculate, scabrous; paleas 2.8-4.5 mm, similar to the lemmas in texture, glabrous; anthers 1.6-1.8 mm, dehiscent, not penicillate. Caryopses 2-4 mm, ovoid. 2n = unknown.

Discussion

Achnatherum wallowaense grows in shallow, rocky soil at scattered localities, from 1000-1600 m, in the Wallowa and Ochoco mountains, Oregon.

Selected References

None.

Lower Taxa

None.