Difference between revisions of "Achnatherum robustum"
FNA>Volume Importer |
imported>Volume Importer |
||
(5 intermediate revisions by 2 users not shown) | |||
Line 7: | Line 7: | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Stipa vaseyi | |name=Stipa vaseyi | ||
− | |authority= | + | |authority= |
+ | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Stipa robusta | |name=Stipa robusta | ||
− | |authority= | + | |authority= |
+ | |rank=species | ||
}} | }} | ||
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Achnatherum;Achnatherum robustum | |hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Achnatherum;Achnatherum robustum | ||
Line 33: | Line 35: | ||
-->{{#Taxon: | -->{{#Taxon: | ||
name=Achnatherum robustum | name=Achnatherum robustum | ||
− | |||
|authority=(Vasey) Barkworth | |authority=(Vasey) Barkworth | ||
|rank=species | |rank=species | ||
Line 40: | Line 41: | ||
|basionyms= | |basionyms= | ||
|family=Poaceae | |family=Poaceae | ||
+ | |illustrator=Cindy Roché | ||
+ | |illustration copyright=Utah State University | ||
|distribution=Colo.;N.Mex.;Tex.;Nebr.;Kans.;Ariz.;Wyo.;S.Dak. | |distribution=Colo.;N.Mex.;Tex.;Nebr.;Kans.;Ariz.;Wyo.;S.Dak. | ||
|reference=None | |reference=None | ||
Line 45: | Line 48: | ||
|publication year= | |publication year= | ||
|special status= | |special status= | ||
− | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V24/V24_166.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
Plants cespitose, not rhizomatous. Culms 100-230 cm tall, 2-4.5 mm thick, mostly glabrous, often pubescent below the nodes, the pubescence antrorse or retrorse; nodes 4-5. Basal sheaths mostly glabrous, margins usually ciliate distaily; collars hairy, those of the flag leaves densely hairy, hairs 0.5-2 mm, sides glabrous; basal ligules 1-2 mm; upper ligules to 4 mm, truncate, rounded, or obtuse, glabrous; blades 6-10 mm wide, glabrous, abaxial surfaces smooth, adaxial surfaces prominently ribbed, ribs scabrous. Panicles 15-30 cm long, 0.8-3.5 cm wide; branches straight, appressed to ascending, lower branches 3-9 cm. Spikelets appressed to the branches. Glumes subequal, 9-11.5 mm long, 1-1.4 mm wide; florets 5.9-8.5 mm long, 0.9-1.2 mm thick, fusiform, terete; calluses 0.3-1 mm, blunt; lemmas evenly hairy, hairs at midlength 0.3-0.8 mm, apical hairs to 1.5 mm; awns 20-32 mm, persistent, twice-geniculate, scabridulous to scabrous, scabrules to about 0.1 mm, longest on the middle segment, terminal segment straight; paleas 3.7-5.6 mm, 2/3 - 3/4 as long as the lemmas, hairy, hairs about 0.5 mm, not exceeding the apices, veins terminating below the apices, apices rounded; anthers 4-5 mm, dehiscent, penicillate. Caryopses 5-6 mm. 2n = 64.
Distribution
Colo., N.Mex., Tex., Nebr., Kans., Ariz., Wyo., S.Dak.
Discussion
Achnatherum robustum grows on dry plains and hills, in open woods and forest clearings, and along roadsides, from Wyoming through Colorado to Arizona, New Mexico, and northern Mexico. Records from Kansas represent recent introductions; it is not clear whether the species has persisted there. Achnatherum robustum is sometimes confused with A. nelsonii subsp. dorei and Nassella viridula; it differs from both in the densely hairy collars of its flag leaves. Although not widely available, it has potential as an ornamental grass, particularly in arid regions with cold winters.
The English-language name refers to the effect some samples, particularly those from the Sacramento and Sierra Blanca mountains, New Mexico, have on livestock, especially horses and cattle. "Mildly poisoned animals are dejected, inactive, and withdrawn; severely poisoned animals lie on their sides in a profound slumber" (Cheeke and Shull 1985). The active ingredient is diacetone alcohol (Epstein et al 1964).
Selected References
None.