GRAMINE.E. (gRASS FAMILY.) 587 



branched, many-flowered (l^'-2' long) ; spikelets minute, purple, very smooth, 

 the upper glumes 5-uervecl. (P. ramulosum, Flora.) — Low sandy pine 

 barrens, Florida and Georgia. 



H- ■)- -I- -1- Culms frulescent : spikelets noddiiuj. 



43. p. divaricatum, L. Shrubby, smooth ; culms reclining, with short 

 and spreading branches ; leaves lanceolate, faintly nerved, deciduous from the 

 persistent sheaths ; panicles small, simple, few-flowered, terminating the 

 branches ; spikelets {•!" long) obovate, turgid ; glumes smooth, many-nerved, 

 tipped with a tuft of down. — Keys of South Florida. — Leaves 1^' - 2' long. 

 Branches of the panicle short and diverging. 



§ -3. EcHiNOCHLOA. — Spikelets crowded on one side of the ruceined or pani- 

 cled sj)ikes: (jlnmes hispid-poiitted or aimed. 



44. P. Crus-galli, L. Culm stout (2° -4° high), branching; leaves very 

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

 very numerous ; spikelets clustered ; glumes strongly hispid on the nerves 

 acute or long-awued. — Marshes, and around homesteads, common. August - 

 Sept. (T) — Awns pale or purple. 



45. P. colonum, L. Culms (l°-2° high) branching; leaves linear, 

 smooth, like the sheaths; spikes 5-12, distant, erect or appressed ij-V 

 long), bearded at the base ; spikelets in 3 rows, awnless ; glumes hispid on the 

 nerves, pointe<l ; floret barely pointed ; rachis rough. — With the preceding. 

 July - Sept. (i) — Spikelets purplish. 



§ 4. HvMEXACHNE. — Spikclets Crowded in a spicate panicle: second glume 

 gibhoHs at the base, twice as long as the floret. 



46. P. gibbum, Ell. Culms branching, reclining, 2° - 4° long ; leaves 

 linear-lanceolate, 3' -6' long, smooth or hairy; panicle 3'-G' long; second 

 glume 11 -nerved, oval, the lower minute ; sterile flower triandrous. — Swamps 

 in the lower districts. 



8. SETARIA, Beauv. Fox-Tail. Pigeon Grass. 



Spikelets as in Panicuin proper, in compact spikes- or spike-like jjauicles, the 

 short pedicels bearing an involucre of one or more hispid persistent bristles 

 below the joint. Mostly erect, annuals. 



* Bristles hispid downward. 



1. S. vertieillata, Beauv. Culms 2° high; leaves lanceolate-linear; 

 spikes compact, 2' -3' long; bristles 1-2, short. — Around homesteads. 

 Introduced. 



* * Bristles hispid upward. 



-t- Spikes simple, cijlindricaJ. 



2. S. glauca, Beauv. Annual; culms slightly compressed, 1°- 2° high j 

 leaves linear-lanceolate, scabrous above: spikes compact, pale or purple, bris- 

 tles 6 - 10, much longer than the spikelets ; floret rugose. — Cultivated ground, 

 common. 



3. S. ISBVigata. Perennial, glabrous; culms more compressed; leave.s 

 longer and narrower; floret obscurel}^ rugulose ; spikes yellowish; spikelets 

 of the preceding. (Panicum, Muld.) — Saline marshes along the coast. 



