580 GRAMINE^. (GRASS FAMILY.) 



24. P. Walterianum, Schultes, Culms creeping ; leaves linear, 1'- 2' 

 long ; spikes 3 - 6 ; spikelets glabrous, partly concealed under the rachis. 

 Low muddy banks, North Carolina, and westward. 



3. ERIOCHLOA, IIBK. 



Inflorescence as in Paspalnm, but the spikelets (in ours) 2-flowered, the 

 lower flower staminate, and the glume of the floret tipped with a short pubes- 

 cent awn. Pedicel of the spikelets thickened above the joint. 



1. E. mollis, Kunth. Culms stout, 4-6 high, simple or branching; 

 leaves 1- li long, flat, widening upwards ; panicle downy ; spikes or racemes 

 8- 10, 2' -4' long; spikelets in 2 rows under the filiform rachis, ovate-lanceo- 

 late, acute, appressed'pubescent. Var. LONGIFOLIUM (K. lougifolium, ]'asey), 

 is lower (2 -3 high) and more slender; leaves narrower. Coast of Florida 

 to South Carolina, in sandy soil. 



4. OPLISMENUS, Beauv. 



Panicle composed of short cluster-like few-flowered distant l-sided spikes; 

 glumes nearly equal, unequally (the lowest longer) awued. 



1. O. setarius, L. Culms ascending from a long creeping base, slender, 

 branching; leaves ovate-lanceolate, thin, l'-2' long; spikes about 5, 5-8-flow- 

 ered. (Panicum hirtellum, /S'. Flora) Low shady woods, North Carolina to 

 Mississippi, near the coast. 



5. ANTHJENANTIA, Beauv. 



Spikelets single, oblong or obovate, loosely racemose on the erect branches 

 of the contracted terminal panicle, 2-flowered, the lower flower staminate or 

 neutral ; empty glumes strongly 5-nerved, very villous, as long as the coria- 

 ceous acute floret. Stamens 3. Perennial grasses, with simple, erect culms 

 and linear leaves. 



1. A. villosa, Benth. Culms smooth ; leaves linear-lanceolate, strongly 

 nerved, fringed 011 the margins, the lower ones widely spreading ; panicle 

 racemose; spikelets obovate; sterile flower 3-androus ; anthers and stigmns 

 yellow. (Aulaxanthus ciliatus, Ell.) Dry gravelly soil, Florida to North 

 Carolina. July -August. Culms 2 -3 high. Leaves and spikelets pale. 



2. A. rufa, Benth. Leaves erect, linear, smooth, elongated ; sterile 

 flower neutral; anthers and stigmas purple; otherwise like the preceding. 

 (Aulaxanthus rufus, Ell.) Pine barren swamps, Florida to North Carolina. 

 Sept. Leaves and spikelets purplish. 



6. AMPHICARPUM, Kunth. 



Perennial flat-leaved grasses, with the spikelets nearly as in Panicum, but of 

 two kinds ; one perfect, but rarely fruitful, disposed in a simple terminal 

 panicle or raceme; the other larger, pistillate or perfect, and borne at the' 

 summit of long runner-like radical peduncles. Lower glume minute or 

 wanting. 



