Difference between revisions of "Pleuropogon oregonus"
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|common_names=Oregon semaphoregrass | |common_names=Oregon semaphoregrass | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms= | |synonyms= | ||
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name=Pleuropogon oregonus | name=Pleuropogon oregonus | ||
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|authority=Chase | |authority=Chase | ||
|rank=species | |rank=species | ||
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|basionyms= | |basionyms= | ||
|family=Poaceae | |family=Poaceae | ||
| + | |illustrator=Linda Ann Vorobik;Hana Pazdírková | ||
| + | |illustration copyright=Utah State University | ||
|distribution=Oreg. | |distribution=Oreg. | ||
|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_138.xml |
|subfamily=Poaceae subfam. Pooideae | |subfamily=Poaceae subfam. Pooideae | ||
|tribe=Poaceae tribe Meliceae | |tribe=Poaceae tribe Meliceae | ||
Latest revision as of 17:22, 11 May 2021
Plants perennial; not cespitose, rhizomatous. Culms 40-95 cm tall, 2-3.5 mm thick, erect. Sheaths glabrous, smooth or scabridulous; ligules 5-10 mm, rounded or acute, often erose; blades 5-17 cm long, 4-9 mm wide, smooth or scabridulous over the veins, apices spinose. Racemes 13-20 cm, with 6-7 spikelets; lower internodes 3.5-7.2 cm; upper internodes shorter; pedicels 2-5(12) mm. Spikelets 20-40(50) mm, with 7-14 florets, lower florets bisexual, upper florets pistillate, terminal florets usually sterile. Glumes lanceolate to ovate, acute, erose; lower glumes 2-3 mm; upper glumes 2.5-4.5 mm; rachilla internodes 2-3 mm long, 0.1-0.2 mm thick, without a glandular swelling at the base; lemmas 5.5-7 mm, scabridulous, 7-veined, veins prominent, apices truncate, sometimes erose, awned, awns 5-12 mm; paleal keels awned, awns 3-9 mm, inserted 1/3 – 1/2 of the way from the base; anthers about 4 mm. Caryopses 2.5-3 mm. 2n = unknown.
Discussion
Pleuropogon oregonus grows in swampy ground, wet meadows, and stream banks. It is known, even historically, from only a few locations in Union and Lake counties, Oregon. In 1975 it was thought to be extinct, but a population has since been discovered at one location in Lake County. The species is listed as threatened by the state of Oregon.
Selected References
None.