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Tall Trisetum

Trisetum canescens Buckley

Comprehensive Description

provided by North American Flora
Trisetum canescens Buckl. Proc. Acad. Phila. 1862; 100. 1863
Trisetum (ernuum var. canescens Beal, Grasses N. Am. 2: 380. 1896. (Based on T. canescens Buckl.) Trisetum canescens i. tonsum Louis-Marie, Rhodora 30: 216. 1928. (Type from Trinity Co.,
California, Yates 533.) Trisetum canescens i. velutinum Louis-Marie, Rhodora 30: 216. 1928. (Tyjre from Lassen's Peak,
California.) Trisetum projeclum Louis-Marie, Rhodora 30: 217. 1928. (Type from Fresno Co., Calif., Hall &■
Chandler 359.)
Perennial, culms erect or decumbent at the base, glabrous, 60-120 cm. tall; sheaths, at least the lower, sparsely to densely and softly retrorse-pilose, rarely scabrous only; ligule scaberulous, truncate, erose-dentate, ciliate, 1-2 mm. long; blades flat, scabrous or canescent, sometimes sparsely pilose, mostly 2-7 mm. wide; panicle narrow, usually loose and somewhat nodding, sometimes interrupted and spikelike, 10-25 cm. long, the axis scabrous, the branches verticillate, some longer and naked below, some short ones intermixed, sometimes all short, making the panicle narrow and interrupted; spikelets about 8 mm. long, 2-flowered or 3flowered, the florets not so distant as in T. cernuum, the rachilla strongly villous; glumes smooth except the keel, the first narrow, 1 -nerved, acuminate, the second broad, acute, 3-nerved, 5-7 mm. long; lemmas rather firm, scaberulous, the upper exceeding the glumes, 5-6 mm. long, the teeth aristate; awn geniculate, spreading, loosely twisted below, attached one third below the tip, usually about 12 mm. long.
Type locality: Columbia plains, Oregon (NuttalV).
Distribution: Mountain meadows, moist ravines, and along streams, Montana to British Columbia, and southward to central California.
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bibliographic citation
Albert Spear Hitchcock, Jason Richard Swallen, Agnes Chase. 1939. (POALES); POACEAE (pars). North American flora. vol 17(8). New York Botanical Garden, New York, NY
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Physical Description

provided by USDA PLANTS text
Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Plants conspicuously hairy, grayish, or wooly, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath hairy, hispid or prickly, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades more or less hairy, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence branches more than 10 to numerous, Flowers bisexual, Spikelets pedicellate, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 2 florets, Spikelets with 3-7 florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, g lumes persistent, Spikelets disarticulating beneath or between the florets, Rachilla or pedicel hairy, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glumes keeled or winged, Glumes 1 nerved, Glumes 3 nerved, Lemma similar in texture to glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex dentate, 2-fid, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn 1-2 cm long, Lemma awn subapical or dorsal, Lemma awns straight or curved to base, Lemma awn once geniculate, bent once, Lemma margins thin, lying flat, Lemma straight, Callus or base of lemma evidently hairy, Callus hairs shorter than lemma, Palea present, well developed, Palea membranous, hyaline, Palea about equal to lemma, Palea longer than lemma, Palea 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.
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USDA PLANTS text

Trisetum canescens

provided by wikipedia EN

Trisetum canescens is a species of grass known by the common names tall trisetum[1] and tall false oat.

Distribution

The bunchgrass is native to western North America from Alaska and British Columbia to central California and Arizona, where it occurs in forests, mountain meadows, and streambanks, being most common among Ponderosa pines and stands of spruce and fir.

Description

Trisetum canescens is a perennial bunchgrass forming clumps of erect stems up to 50–80 centimetres (20–31 in) tall, but known to exceed 1 metre (3.3 ft).

There are three to four leaves per stem, the blades reaching up to 30 centimeters in length. The sheaths can be hairless to quite hairy, the hairs sometimes long and shaggy.

The inflorescence is an open or compact panicle of green, tan, or purplish spikelets up to 20 centimeters long.

References

  1. ^ USDA, NRCS (n.d.). "Trisetum canescens". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 15 December 2015.

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Trisetum canescens: Brief Summary

provided by wikipedia EN

Trisetum canescens is a species of grass known by the common names tall trisetum and tall false oat.

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