GRAMINEJE. (GRASS FAMILY.) 587 



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

 the upper glumes 5-nerved. (P. ranmlosum, Flora.) Low sandy pine 

 barrens, Florida and Georgia. 



t- -t -t- 4- Culms frutescent : spikelets nodding. 



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 (2" 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 aud diverging. 



3. ECHINOCIILOA. Spikelets crowded on one side of the race med or pan i- 

 cled spikes: glumes hispid-pointed or aimed. 



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

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

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

 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 (^'-1' 

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

 nerves, pointed ; floret barely pointed ; rachis rough. With the preceding. 

 July - Sept. (T) Spikelets purplish. 



4. HVMENACHNE. Spikelets crowded in a spicate panicle: second glume 

 gibbous 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'- 6' long; second 

 glume 1 1 -nerved, oval, the lower minute ; sterile flower triaudrous. Swamps 

 in the lower districts. 



8. SETARIA, Beauv. FOX-TAIL. PIGEON GRASS. 



Spikelets as in Panicum proper, in compact spikes or spike-like panicles, the 

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

 below the joint. Mostly erect, annuals. 



* Bristles hispid downward. 



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

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



Introduced. 



* * Bristles hispid upward. 



-i- Spikes simple, cylindrical. 



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

 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. Isevigata. Perennial, glabrous ; culms more compressed ; leaves 

 longer and narrower ; floret obscurely rugulose ; spikes yellowish ; spikelets 

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



