Panicum trichanthum Nees

Panicum trichanthum Nees, Agrost. Bras. 210. 1829
? Milium microspermum Lag. Gen. & Sp. Nov. 2. 1816.
Panicum guayaquilense Steud. Syn. Gram. 85. 1854.
Panicum microspermum Fourn.; Hemsl. Biol. Centr. Am. Bot. 3: 492. 1885.
Plants often in large bunches; culms ascending from a decumbent base, as much as 1-2 meters long, rather stout, glabrous ; leaf-sheaths shorter than the internodes, ciliate, and usually with a villous ring at the juncture with the blade, otherwise glabrous or rarely pubescent toward the summit; ligule membranaceous, less than 0.5 mm. long; blades oblong-lanceolate, usually 10-15 cm. long, 10-15 or rarely 25 mm. wide, cordate, rather strongly nerved, glabrous or puberulent, often pilose above the ligule ; panicles 10-30 cm. long, the axis glabrous, the numerous branches and branchlets and the long pedicels capillary, flexuous; spikelets 1.2-1.4 mm. long, 0.6 mm. wide, ob ovate-fusiform, acute; first glume less than one fifth the length of the spikelet; second glume shorter than the sterile lemma, both 3-nerved and under a lens minutely bullate-rugose, often ruptured and breaking off as the fruit matures, as in P. trichoides; fruit 1.2 mm. long, 0.6 mm. wide.
Typjs locality: Mexico.
Distribution: Mexico and the West Indies to Paraguay.

Perennials, Terrestrial, not aquatic, Stems trailing, spreading or prostrate, Stems nodes swollen or brittle, Stems erect or ascending, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems terete, round in cross section, or polygonal, Stems branching above base or distally at nodes, Stem internodes hollo w, Stems with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves pseudo-petiolate, petiole attached to sheath, 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 lanceolate, Leaf blades 2-10 mm wide, Leaf blades 1-2 cm wide, Leaf blades 2 or more cm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Leaf blades scabrous, roughened, or wrinkled, 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 dorsally compressed or terete, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets with 2 florets, Spikelet with 1 fertile floret and 1-2 sterile florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating below the glumes, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes 4-7 nerved, Lemma similar in texture to glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma awnless, Lemma margins inrolled, tightly covering palea and caryopsis, Lemma straight, Palea present, well developed, Palea about equal to lemma, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.

Panicum trichanthum adalah spesies tumbuhan yang tergolong ke dalam famili Poaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Panicum trichanthum sendiri merupakan bagian dari genus Panicum. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Nees.

O Capim-adancaá (Panicum trichanthum) é uma erva forrageira, da família das gramíneas, nativa do Brasil, dos estados do Amazonas até o Piauí e Goiás. Tal espécie possui folhas lineares e inflorescências em amplas panículas; os rizomas são aromáticos, excitantes, diuréticos e emolientes. Também é conhecido simplesmente pelo nome de capim-mimoso ou andacaá.

Panicum trichanthum là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Nees mô tả khoa học đầu tiên năm 1829.