Difference between revisions of "Piptatherum micranthum"
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|common_names=Small-flowered piptatherum | |common_names=Small-flowered piptatherum | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Oryzopsis micrantha | |name=Oryzopsis micrantha | ||
| − | |authority= | + | |authority= |
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Piptatherum;Piptatherum micranthum | |hierarchy=Poaceae;Poaceae subfam. Pooideae;Poaceae tribe Stipeae;Piptatherum;Piptatherum micranthum | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Piptatherum micranthum | name=Piptatherum micranthum | ||
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|authority=(Trin. & Rupr.) Barkworth | |authority=(Trin. & Rupr.) Barkworth | ||
|rank=species | |rank=species | ||
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|basionyms= | |basionyms= | ||
|family=Poaceae | |family=Poaceae | ||
| + | |illustrator=Cindy Roché;Hana Pazdírková | ||
| + | |illustration copyright=Utah State University | ||
|reference=None | |reference=None | ||
|publication title= | |publication title= | ||
|publication year= | |publication year= | ||
| − | |special status= | + | |special status=Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/200273ad09963decb8fc72550212de541d86569d/coarse_grained_fna_xml/V24/V24_199.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 loosely cespitose, not rhizomatous. Culms 20-85 cm, glabrous; basal branching extravaginal. Leaves basally concentrated; sheaths glabrous; ligules 0.4-1.5(2.5) mm, truncate; blades 5-16 cm long, 0.5-2.5 mm wide, usually involute. Panicles 5-20 cm, lower nodes with 1-3 branches; branches 2-6 cm, divergent to reflexed at maturity, with 3-10(15) spikelets, secondary branches appressed to the primary branches. Glumes 2.5-3.5 mm, acute; lower glumes 1(3)-veined; upper glumes 3-veined; florets 1.5-2.5 mm, dorsally compressed; calluses 0.1-0.2 mm, glabrous or sparsely hairy, disarticulation scars circular; lemmas usually glabrous, sometimes sparsely pubescent, brownish, shiny, 5-veined, margins not overlapping at maturity; awns 4-8 mm, straight or almost so, caducous; anthers 0.6-1.2 mm, not penicillate; ovaries truncate to rounded, bearing 2 separate styles. Caryopses about 1.2 mm long, about 0.8 mm wide; hila linear, 3/4 - 9/10 as long as the caryopses. 2n = 22.
Discussion
Piptatherum micranthum grows on gravel benches, rocky slopes, and creek banks, from British Columbia to Manitoba and south to Arizona, New Mexico, and western Texas. The combination of small, dorsally compressed florets and appressed pedicels distinguishes this species from all other native North American Stipeae. Achnatherum contractum is the fertile derivative of hybridization between Piptatherum micranthum and A. hymenoides. It is placed in Achnatherum because it resembles that genus more than Piptatherum.
Selected References
None.