GRAMINEX. (GRASS FAMILY.) 557 
18. EUSTACHYS, De. 
Chiefly tropical grasses, with compressed culms and sheaths, distichous flat or 
folded obtuse leaves, and digitate rarely single spikes. Spikelets 2 — 3-flowered, 
imbricated or crowded in 2 rows on one side of the triangular rachis ; the lowest 
flower perfect and sessile, the upper ones staminate or neutral, and stalked. 
Glumes 2, membranaceous, persistent, the upper (exterior) one short-awned. 
Palezx coriaceous, the lower one boat-shaped, mucronate-awned under the apex, 
the upper (mostly wanting in the sterile flowers) unawned., Stamens 3. Grain 
free. 
1. E. petreea, Desv. Culms (1°-2° high) clustered, erect; leaves glau- 
cous; spikes 3-5; spikelets 2-flowered; glumes hispid, the upper oblong, 
deeply emarginate ; lower palea dark brown, hairy on the keel and margins, 
bearded at the base ; sterile flower neutral, club-shaped, awnless. — Damp soil 
along the coast, Florida to North Carolina. May- Aug. | — Leaves 3/-5! 
long. Spikes erect. Spikelets roundish. ae 
2. E. glauca, n. sp. Culms stout (3°-5° high), and, like the broad 
(6 8" long) leaves, smooth and glaucous ; spikes about 20; spikelets roundish, 
2-flowered ; glumes hispid, the upper lanceolate, entire; paleæ dark brown, 
smooth ; upper flower obovate, short-awned. — Brackish secant West Florida, 
Aug. and Sept. (3) — Culms }/ wide at the base. - “Leaves 14°- 29 long. 
3. E. Floridana, n. sp. Culms slender (2° high); leaves (2/- 4! long) 
glaucous; spikes single or by pairs ; spikelets light brown, 3-flowered, the mid- 
dle flower staminate; glumes smoothish, truncate, oblong ; lower palea of the 
perfect flower hairy on the keel and margins, distinctly awned ; sterile flowers 
obovate, smooth, the lower one short-awned. — Dry pine barrens, Middle Flor- 
ida. July- Sept. l} — Spikelets larger than in the two preceding. 
19. CYNODON, Richard. Bermupa-Grass. 
Diffusely creeping grasses, with short and erect flowering stems, and flat 
leaves. Spikes digitate, 1-sided. Spikelets crowded, awnless, 2-flowered; the 
lówer flower perfect, the upper an awn-like pedicel. Glumes 2, membranaceous, 
nearly equal. Pales 2, membranaceous, the lower one nios so keeled.. Sta- 
mens 3. Grain free. 
1. C. Dactylon, Pers. Spikes 3-5, filiform, penis ditis tiib 
keeled ; paleæ longer than the glumes, the lower one boat-shaped, and hairy 
on the ER anthers and stigmas purple. (Digitaria Dactylon, Ell.) — Waste 
places. Introduced. — Culms perennial. Leaves 2'-4! long. Spikes 1/-2/ 
long, filiform. 
20. CTENIUM, Panz. 
Mawa grasses, with the erect culms terminated by a single faleate apike: 
Spikelets 4— 5-flowered, crowded in two rows on the lower side of the flattened 
$05 rachis ; the two lower sterile, of 1-2 cag are awned ander the apex, 
