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Porter's Reedgrass

Calamagrostis porteri A. Gray

Comprehensive Description

provided by North American Flora
Calamagrostis porteri A. Gray, Proc. Am. Acad. 6: 79. 1862
Deyeuxia Porteri Vasey, Grasses U. S. 28. 1883. (Based on Calamagrostis Porteri A. Gray.)
Culms slender, glabrous, erect, 2-4-noded, 60-120 cm. tall, with slender rhizomes; sheaths glabrous except the pubescent collar; ligule 2-4 mm. long; blades flat, spreading, lax, scaberulous, 4-8 mm. wide; panicle narrow but rather loose, pale or purplish, erect or somewhat nodding, 10-15 cm. long, the axis scabrous, the branches scabrous, ascending or appressed, overlapping, as much as 5 cm. long; glumes acuminate, scaberulous, 4-6 mm. long; lemma slightly shorter than the glumes, toothed at the apex, the awn from near the base, about as long as the lemma, bent and protruding from the side of the glumes; palea about as long as the lemma; callus-hairs rather scant, nearly half as long as the lemma; rachilla-hairs scant, extending to aboul 3 mm.
Type locality: Huntingdon County, Pennsylvania (Porter in 1862).
Di iTRIBUTION: Dry rocky soil, rare, New York, Pennsylvania, Virginia (Luray), and West Virginia.
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bibliographic citation
Albert Spear Hitchcock. 1937. (POALES); POACEAE (pars). North American flora. vol 17(7). New York Botanical Garden, New York, NY
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Physical Description

provided by USDA PLANTS text
Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome elongate, creeping, stems distant, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, 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 cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy at summit, throat, or collar, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades 1-2 cm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades glaucous, blue-green, or grey, or with white glands, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, Inflorescence a contracted panicle, narrowly paniculate, branches appressed or ascending, 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 1 fertile floret, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between t he florets, Rachilla or pedicel hairy, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes 1 nerved, Glumes 3 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn subapical or dorsal, 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 shorter than lemma, Palea about equal to lemma, Palea 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Plants sterile, few or no mature seeds produced, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.
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compiler
Dr. David Bogler
source
Missouri Botanical Garden
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USDA NRCS NPDC
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