Andropogon tenuispatheus Nash, sp. nov
Andropogon macrourus pumilus Vasey, Bot. Gaz. 16 : 27. 1891. Not A. pumilus'Roxh. 1820. Andropogon glomeratus tenuispatheus Nash, in Small, Fl. SE. U. S. 61. 1903.
Stems 5-15 dm. tall, commonly stout, much branched, the branches repeatedly and fastigiately divided, the lower ones somewhat elongate but considerably shorter than the stem, thus forming a large oblong glomerate panicle, rarely shorter and corymbiform, the nodes of the secondary branches and their divisions, and sometimes the nodes of the primary branches, densely barbed; leaf-sheaths keeled, glabrous, or sometimes pubescent; blades up to 4 dm. long, 7 mm. wide or less, rough; spathes 2.5-3 cm. long, smooth and glabrous, equaling or somewhat exceeding the racemes, or tightly inroUed on the exserted or nearly exserted smooth and glabrous peduncle, fastigiately crowded at the summit of the stem and ends of the branches ; racemes in pairs, 1-2 cm. long; sessile spikelet 3-4 mm. long, lanceolate, the first scale hispid on the keels, the intercarinal space flat or somewhat depressed, the fourth scale entire or nearly so, the awn 10-15 mm. long, straight or geniculate, the hispid subula many times longer than the column; pedicellate spikelet wanting, or present as a subulate rudimentary scale.
Type locality : Florida.
Distribution: Georgia and Florida to southern California; I^ower California; Guatemala; Bahamas and other West Indies ; also in tropical South America.

Andropogon densus Desv.; Hamilt. Prodr. 8. 1825
? Andropogon m.icrostachy us D&sv.; Hamilt. Prodr. 8. 1825.
? Deyeuxria spicata Sprang. Syst. 1 : 254. 1825.
Andropogon scoparius J. Presl, in Presl, Rel. Haenk. 1 : 338. 1830. Not A . scoparius Michx. 1803.
Andropogon paniculaius Kunth, Knum. 1 : 494. 1833.
Andropogon Benthamianus Steud. Syn. Gram. 382. 1854.
Andropogon Lhotskyi Steud. Syn. Gram. 384. 1854.

Perennials, Terrestrial, not aq uatic, Rhizomes present, 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, Stems branching above base or distally at nodes, Stem internodes solid or spongy, 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, 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, Leaf blades glaucous, blue-green, or grey, or with white glands, Ligule present, Ligule an unfringed eciliate membrane, Ligule a fringed, cilia te, or lobed membrane, Inflorescence terminal, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence lax, widely spreading, branches drooping, pendulous, Inflorescence a panicle with narrowly racemose or spicate branches, Inflorescence with 2-10 branches, Inflorescence branches paired or digitate at a single node, Flowers bisexual, Flowers unisexual, Spikelets pedicellate, Spikelets sessile or subsessile, Spikelets laterally compressed, Inflorescence or spikelets partially hidden in leaf sheaths, subtended by spatheole, Spikelet less than 3 mm wide, Spikelets with 2 florets, Spikelets paired at rachis nodes, Spikelets in paired units, 1 sessile, 1 pedicellate, Pedicellate spikelet rudimentary or absent, usually sterile, Spikelets bisexual, Spikelets unisexual, Inflorescence disarticulating between nodes or joints of rachis, rachis fragmenting, Spikelets disarticulating below the glumes, Spikelets falling with parts of dis articulating rachis or pedicel, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glumes keeled or winged, Glume surface hairy, villous or pilose, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma 1 nerved, Lemma 3 nerved, Lemma glabrous, Lemma apex dentate, 2-fid, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn 1-2 cm long, Lemma awn 2-4 cm long or longer, Lemma awn from sinus of bifid apex, 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, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.