GRAMINEJE. (GRASS FAMILY.) 577 
$3. AULAXANTHUS. — Spikelets awnless, single, loosely racemose on the erect 
branches of the compound contracted panicle: lower glume wanting, the upper one 
5-ribbed, very hairy: perennials. 
28. P. ignoratum, Kunth. Culms erect, simple, smooth; leaves linear- 
lanceolate, pungent, strongly nerved, fringed on the margins, the lower ones 
widely spreading ; panicle racemose ; spikelets obovate; sterile flower 3-androus ; 
anthers and stigmas yellow. (Aulaxanthus ciliatus, Ell.) — Dry gravelly soil, 
Florida to North Carolina. July and Aug.— Culms 2°-3° high. Leaves and 
spikelets pale. 
29. P. rufum, Kunth. Leaves erect, linear, smooth, elongated; sterile 
flower neutral ; anthers and stigmas purple ; otherwise like the preceding. (Au- 
laxanthus rufus, Ell.) — Pine-barren swamps, Florida to North Carolina. Sept. 
— Leaves and spikelets purplish. — 
$4. ECHINOCHLOA. — Spikelets crowded on one side of the racemed or pani- 
cled spikes: glumes and lower palea of the sterile flower hispid-pointed or awned. 
30. P. Crus-galli, L. Culm stout (2°-4° high), branching ; leaves very 
long, broadly linear, rough ; sheaths smooth, rough, or hispid; spikes (1! — 9' 
long) very numerous, crowded in a long raceme; spikelets clustered; glumes 
and lower palea of the sterile flower strongly hispid on the nerves, awn-pointed 
or long-awned ; fertile flower rough-poi ted. — Wet places, Due mis mero. 
ward. Aug. and Sept. @—Awns pale or purple. — — 
31. P. Walteri, Ell. Culms (19-29 high) irabeidog; bed (SR 
smooth, like the sheaths; spikes 5-12, distant, erect or appressed (J/-1' long), 
bearded at the base; spikelets in 3 rows, awnless; glumes and lower palea his- 
pid on the nerves, pointed; fertile flower barely pointed ; rachis rough. — Damp 
soil, Florida to North Carolina. July-Sept. (d) — Spikelets purplish. 
32. P.? molle, Michx. “Spikes panicled, alternate, expanding, flower- 
ing on one side; spikelets approximate, pedicillate, on one side, awnless," Ell. 
— Sea islands of South Carolina, Elliott. Aug. and Sept. | — Culm 4°-6° 
high, smooth below, downy above. Leaves 12/-18’ long, smooth, fringed at 
the throat. Spikelets 2-3 together on a villous rachis, hairy. Plant salt and 
bitter. : 
§ 5. ORTHOPOGON. — Panicle simple, spiked: spikes few-flowered, distant : 
glumes equal, hairy, the lower one long-awned : upper and lower palec of the sterile 
lower short-awned. 
33. P. hirtellum, L. Culms slender, ascending from a creeping base; 
leaves (1/-2' long) ovate-lanceolate, thin; sheaths hairy; spikes about 5, dis- 
tant, 5 - 8-flowered ; awns (often purple) clammy. — Shady woods, Florida to 
North Carolina. Aug. and Sept. Y Modo 19 - 29 long, branched, the erect 
— 6'-12'high 
Ter re ai ot Dre 
