GKAMINE^E. (GRASS FAMILY.) 577 



3. AULAXANTHUS. Spikelets awnless, single, loosely racemose on the erect 

 branches of the compound contracted panicle : lower (jlume 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 ciliatns, 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 owned. 



30. P. CruS-galli, L. Culm stout (2 -4 high), branching ; leaves very 

 long, broadly linear, rough; sheaths smooth, rough, or hispid; spikes (l'-2' 

 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-pointed. Wet places, Florida, and north- 

 ward. Aug. and Sept. (I) Awns pale or purple. 



31. P. Walter!, Ell. Culms (l-2 high) branching; leaves linear, 

 smooth, like the sheaths ; spikes 5 12, distant, erect or appressed ('-!' 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. (1) 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. 1J. 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: 

 (jlumes equal, hairy, the lower one long-awned: upper and lower palea?, of the sterile 

 flower short-owned. 



33. P. hirtellum, L. Culms slender, ascending from a creeping base; 

 leaves (l'-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. Culms l-2 long, branched, the erect 

 portion 6' -12' high. 



50. SETARIA, Beauv. 



Erect annual grasses, with flat leaves and the spikelets of Panicum proper, 

 but crowded in cylindrical spike-like panicles ; the short pedicels bearing one or 

 more bristles, which usually exceed the spikelets. 

 49 



