Eriochloa acuminata (J. Presl) Kunth

Eriochloa acuminata (J. Presl) Kunth, Enum. 1 : 72. 1833
Pipiatherufn acuminatum J. Presl, in Presl, Rel. Haenk. 1 : 221. 1830. Eriochloa punctata minor Y^-s^jj Contr. U. S. Nat. Herb. 3: 21. 1892.
Annual. Stems up to 8 dm. tall, sometimes branched, glabrous, or pubescent above; leaf-sheaths glabrous; blades up to 2 dm. long and 1 cm. wide, glabrous; inflorescence usually of numerous racemes, 8-15 cm. long, the axis pubescent with short spreading hairs and longer ascending ones; racemes erect or nearly so, 2-4 cm. long, the rachis triangular, pubescent with short spreading hairs and longer ascending ones; spikelets often in pairs, at least at the base of the racemes, 4-6 mm. long, about 1.5 mm. wide, ovateelliptic, the first scale wanting, the second and third scales appressed-hirsute below, acute or cuspidate, or the second rarely bearing a short awn, the fruiting scale elliptic, obtuse, about three fourths as long as the body of the first scale, obtuse, mucronate, dull or faintly shining, papillose-roughened.
Type locality : Mexico.
Distribution : Texas to Arizona and northern Mexico.

Helopus gracilis Fourn. Mex. PI. Gram. 13. 1881
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Annual. Stems up to 1 m. tall, pubescent at or near the nodes and below the inflorescence, or occasionally all over; leaves commonly glabrous, sometimes pubescent; blades up to 2.5 dm. long and 2 cm. wide; inflorescence 1-2 dm. long, its axis pubescent, rarely glabrous; racemes commonly numerous, erect, 1-6 cm. long, the rachis usually pubescent, rarely glabrous; spikelets 4-5 mm. long, acute, the first scale wanting, the second and third scales appressed-hirsute below, acute, sometimes awn-pointed, about equal, or the second a little longer, the fruiting scale one half to two thirds as long as the spikelet, elliptic, papillose -roughened, obtuse, bearing a hispidulous awn 0.5-1.25 mm. long.
Type locality : Jamaica.
Distribution: Mississippi to Kansas and Mexico; West Indies; also in tropical South America.

Annuals, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem nodes bearded or hairy, 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 conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, 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 blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Ligule present, Ligule a fringed, ci liate, or lobed membrane, Ligule a fringe of hairs, 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 a panicle with narrowly racemose or spicate branches, 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 paired at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating below the glumes, Spikelets secund, in rows on one side of rachis, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 1 clearly present, the other g reatly reduced or absent, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glumes 3 nerved, Glumes 4-7 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma becoming indurate, enclosing palea and caryopsis, Lemma 5-7 nerved, Lemma glabrous, Lemma rugose, with cross wrinkles, or roughened, Lemma apex truncate, rounded, or obtuse, Lemma apex acute or acuminate, Lemma awnless, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma margins inrolled, tightly covering palea and caryopsis, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea longer than lemma, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.

Eriochloa acuminata là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (J.Presl) Kunth mô tả khoa học đầu tiên năm 1833.