408 



ORDKB 155. GRAMiNE/E. 



awnless, lower carinate, upper bicarinate. Grain 

 ovate- triquetrous, free, loose in its pericarp. Lvs. flat. 



1C. Indica L. Culms clustered, ascending, 3 6 12'; leaves 

 linear; spikes (a) 24, rarely 1, linear, straight, spreading, 

 2- 4' by 2" ; spkl. (6) closely imbricated on the under Ride 

 of the rachis, smooth ; fruit brown. (T) Waysides : com- 

 mon M., S-W. August. 



64. DACTYLOCTENIUM, Wjlld. EGYPTIAN G. Spikes several, 

 digitate, unilateral. Spkl. 2- oo-flwd. Gl. compressed-carinate, the uppei 

 avvned. Pales boat-shaped, acute-mucronate. Grain roundish, free. 



D. Esypticum Wllld. Culms creeping and ascending, 1 IJf; Ivs. ciliate at base; 

 spikes commonly 4 (cruciate), pointed ; spkl. 3-flwd. (T) Fields : com. Va. to Fla. J 



65. SPARTINA, Schreb. MARSH G. CORD G. 

 Sr kl. flat. 1-flvvd., closely imbricated in a double 

 row on one side of the triquetrous rachis, forming 

 dense spikes. Glumes keeled, coriaceous. Pales 

 awnless. Style very long, y Rigid marsh grasses. 



* Upper glume decidedly awned. Lower pale rongh- 



hispid on the keel No. 1 



* Glumes merely pointed... (o) 



a Lower pale rough-hispid on the keel Nos. 2, 3 



a Lower pale smooth. Spikes 112 Nos. 4, o 



1 S. eynosuroides Willd. Culm 2 4f, slender bat 



firm : Ivs. long, narrow, involute-filiform above ; spikes 530. in a raceme-like pam 

 cle, each 2 4' long; tipper glume with its awn 8--10'', lower glume and subequnl 

 palus 45". Brackish soils. August. 



2 S. polystachya Willd. Culm 4 8f, J 1' in diameter ; leaves broadly linear, flat ; 



spikes 2050, in a dense panicle, and 34' ; upper pointed gl. 6", lower gl. 23", 

 half as long as the equal pales. Salt marshes, chiefly southward. Aug., +(a,b.c) 



3 S. graeilts Hook. Culml 2f; Iv*. rolled, rigid, rush-like; spikes 15 30, very short 



(10, closely imbricated into a spike-form panicle. Swamps, Fla. July, August. 



4 S. juiicea Willd. Culm 1 2f, slender; leaves rolled and rush-like or setaceous; 



spikt-s i ii, stib*essile. 1 H' long; upper glume 4", lower H", pales 3|" ; whole 

 plant glabrous except the rough-keeled upper glume. Marshes along the coast. 

 o S. alterniflora Lois. Soft March G. Culm 3 5f, juicy; leaves channeled, lonp; 

 spikes 3 12. sessile, apprised, their rachis produced and 

 pointed : upper gl. lin.. obtuse, smooth as well as the en- 

 tire plant; lower i as long. Salt marshes August. 



66. BOUTELOUA, Lagasca. MUSQUITE G. Spkl. 

 sessile in two rows on one side of the rachis, form- 

 ing dense spikes. Glumes keeled, the lower larger. 

 I' lowers several, the lowest 5 , the rest abortive. 

 Lower pale 3-toothed, upper 2- toothed. Abortive 

 liowers awned. 



| ATHEROPOGON. Spikes numerous and short, forming an 

 erect, virgate, one-sided raceme ; spikelets 4 8 No. 1 



5 CaoNrmosiuM. Spikes 1 or few, dense ; spkl. oc . . Nos. 2, 3 



