588 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Figure 1235.— Distribution of 

 Paspalum rigidifolium. 



7 to 14 cm long; spikelets usually 2.2 to 2.4 mm long, obovate-elliptic, 

 glabrous or nearly so. % — Sand barrens and high pineland, pen- 

 insular Florida to Texas (fig. 1235). 



6. Dimorphostachys. — Inflorescence terminal and axillary; racemes 

 one to few, slender; spikelets in pairs, the first glume usually devel- 

 oped on one of the pair, often on both, or sometimes obsolete on both. 



22. Paspalum unispi- 



catum (Scribn. and 



Merr.)Nash. (Fig. 1236.) 



Culms one to few in a 



tuft from horizontal 



scaly rhizomes, erect or 



ascending, 50 to 80 cm 



tall, simple or with a 



single erect leafy branch ; 



blades flat, rather stiff, 



10 to 30 cm long, 8 to 15 



mm wide, stiffly papil- 



lose-ciliateon the margin, 



sparsely papillose-hirsute 



on both surfaces, or sca- 



berulous only; racemes 



usually solitary, one ter- 

 minal and one from the 



axil of the uppermost 



sheath, 6 to 20 cm long; 



spikelets about 3.2 mm 



long, elliptic; first glume 



on the primary spikelet 



minute, sometimes obso- 

 lete, on secondary spike- 

 let mostly half to three- 

 fourths as long as the 



spikelet. % — Mead- 

 ows, savannas, open slopes, and banks, southern 

 Texas to Venezuela and Argentina; Cuba. 



23. Paspalum monostachyum Vasey. (Fig. 

 1237.) Culms one to few from horizontal scaly 

 rhizomes, erect, 50 to 120 cm tall; blades elon- 

 gate, slender, terete, firm; racemes 1 or 2, 10 to 

 30 cm long; spikelets 3 to 3.5 mm long, subovate- 

 elliptic, the pedicels of the pair nearly equal; 

 first glume often developed in few to several of 

 the primary spikelets, commonly wanting or 

 rudimentary. % (P. solitariumNash.) — Moist 

 places in flatwoods or coastal dunes, southern 

 Florida and Texas. 



24. Paspalum langei (Fourn.) Nash. (Fig. 

 1238.) Culms ascending, 30 to 100 cm tall; 

 blades flat, rather thin, 10 to 40 cm long, 6 to 

 15 mm wide, glabrous to sparsely pubescent, the lower tapering to a 

 narrow base; peduncles 1 to 3 from the upper sheath, often also from 

 the middle sheaths; racemes 2 to 5, 4 to 10 cm long; spikelets 2.2 to 

 2.6 mm long, elliptic-obovate, pubescent and glandular-speckled; 



Figure 1234. — Paspalum rigidi- 

 folium. Raceme, X 1; two 

 views of spikelet, and floret, 

 X 10. (Type.) 



Figure 1236. — Paspalum 

 unispicatum. Raceme, X 1; 

 two views of spikelet, and 

 floret, X 10. (Type.) 



