Comprehensive Description
(
Anglèis
)
fornì da North American Flora
Muhlenbergia expansa (Poir.) Trin. Gram. Pan. 26. 1826
Stipa expan.'ia Poir. in Lam. Encyc. 7; 453. 1806.
.Agrostis arachnoidea Poir. in Lam. Encyc. Suppl. 1; 249. 1810. (Type from Carolina, Bosc.) Trichochloa purpurea Beauv. Agrost. 29. 1812. (Type from United States.)
Vilfa arachnoidea Beauv. Agrost. 147, 181. 1812. (Presumably based on .Agrostis arachnoidea Poir.) Podosaemum purpureum Beauv. Agrost. 176, 179, 1812. (Based on Trichochloa purpurea Beauv.) Trichochloa expansa DC. Cat. Hort. Monsp. 151. 1813. (Based on Stipa expansa Poir.) Agroslis trichopodes Ell. Bot . S. C. & Ga. 1: 135. 1816. (Type from Chatham County, Georgia.) Cinna arachnoidea Kunth, Rev. Gram. 1: 67. 1829. (Based on Agrosiis arachnoidea Poir.) Muhlenbergia arachnoidea Trin.; Kunth, Enum. PI. 1: 207. 1833. (Based on Agrostis arachnoidea
Poir.) Muhlenbergia trichopodes Chapm. Fl. S. U. S. 553. 1860. (Based on Agroslis trichopodes Ell.) Muhlenbergia caespitosa Chapm. Bot. Gaz. 3: 18. 1878. (Type from Apalachicola, Florida.) Muhlenbergia capillaris var. trichopodes Vasey, Contr. U. S. Nat. Herb. 3: 66. 1892. (Based on
Agrostis trichopodes Ell.) Podosaemum trichopodes Bush, Am. Midi. Nat. 7: 30. 1921. (Based on Agrostis trichopodes Ell.)
Perennial, the old basal sheaths forming a fibrous mass; culms erect, slender, glabrousscaberulous below the panicle, 60-90 cm. tall, 2or 3-ncded, the nodes in the lower one third; sheaths glabrous; ligule rather firm, 2-3 mm. long, decurrent; blades flat, soon folded or involute, scabrous on the upper surface and margins, glabrous beneath, mostly less than half the height of the culm, 1-2 mm. wide; panicle open, oblong, 10-20 cm. long, 2-3 times as long as wide, the axis scaberulous, the branches ascending or spreading, slightly flexuous or straight, the slender pedicels (branches of usually the third order) mostly longer than the spikelets; glumes nearly equal, acute or acuminate, glabrous, one third to two thirds as long as the lemma; lemma brownish, acuminate, scaberulous, shortly and sparsely pilose at base, 3.5-5 mm. long, awnless or with an awn as much as 2 mm. long, rarely longer.
Type locality: Carolina {Bosc).
Distribution; Moist pine barrens of the Coastal Plain. North Carolina to Florida and eastern Texas.
- sitassion bibliogràfica
- Albert Spear Hitchcock. 1935. (POALES); POACEAE (pars). North American flora. vol 17(6). New York Botanical Garden, New York, NY
Physical Description
(
Anglèis
)
fornì da USDA PLANTS text
Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome short and compact, stems close, Basal sheaths fibrous, old leaves persistent at base of plant, 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, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichou s, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, 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, 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 the florets, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, G lumes shorter than adjacent lemma, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 3 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 awns straight or curved to base, 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 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.
