POACEAE 75 



2-7 cm. long: spikelets in pairs, obovate, 1.3-1.5 mm. long and about 0.8 mm. broad, the 

 2 outer scales 3-nerved, densely pubescent with short glandular-tipped hairs. 



In rocky pine woods, No-name Key and Key West, Florida. Spring and summer. 



29. Paspalum Blodg6ttli Chapm. Smooth and glabrous. Stems densely tufted, 

 slender, 3-6 dm. tall : leaf-blades 5-15 cm. long, 3-7 mm. wide, narrowed at both ends : 

 racemes erect, 2-6, 1.5-6 cm. long, slender, the rachis flat, winged, about 0.5 mm. broad, 

 about ^ as wide as the spikelets : spikelets in pairs, 1.5-2 mm. long, about 1 mm. broad, 

 elliptic to obovate, the 2 outer scales papillose-pubescent with appressed hairs, 3-nerved. 



On coral soil or shell mounds, Florida. Also in Cuba. Spring and fall. 



30 Paspalum Hallii Vasey & Scribn. Stems 4-10 dm. long, finally prostrate and 

 rooting toward the base, the nodes pubescent : leaf -sheaths more or less hirsute on one 

 margin, the exterior basal ones hirsute all over ; blades 3 dm. long or less, 1-1.5 cm. wide, 

 glabrous on both surfaces : racemes 2-4, usually ascending, the lower ones 5-10 cm. long : 

 spikelets in pairs, broadly obovate, 2.5-3 mm. long and about 2 mm. broad, the 2 outer 

 scales 3-nerved, the first scale strongly hirsute, the second one glabrous. 



In moist soil, Louisiana and Texas. Spring. 



31. Paspalum laeviglumis Scribn. Stems 5-15 dm. long, finally prostrate and 

 rooting toward the base, the nodes pubescent : sheaths more or less hirsute on one margin, 

 otherwise glabrous ; leaf -blades 1-4 dm. long, 1-2 cm. wide, glabrous on both surfaces : 

 racemes 4-7, spreading or ascending, the lower ones usually 5-10 cm. long : spikelets in 

 pairs, oval to broadly obovate, 2.7-3 mm. long, 1.8-2 mm. broad, glabrous, the first scale 

 3-5-nerved, the second scale 5-7 -nerved. 



In moist places, Tennessee to the Indian Territory, Mississippi and Texas. Summer and fall. 



32. Paspalum gemhmm Nash. Stems 5-7 dm. tall : leaf -sheaths compressed, keeled, 

 glabrous, or the basal ones pubescent; blades erect, firm, thick, 2dm. long or less, 6-10 

 mm. wide, glabrous beneath, hirsute above near the base with long hairs : racemes about 3, 

 sometimes more, spreading or ascending, 4-6 cm. long : spikelets in pairs, elliptic, 3-3.3 mm. 

 long and about 2 mm. wide, glabrous, the 2 outer scales 3-nerved. 



In fields and orchards, Florida. Spring and summer. 



33. Paspalum Boscianum Fluegge. Stems 5-12 dm. long, compressed, finally 

 branched, often decumbent at the base and rooting at the lower nodes : leaf-sheaths com- 

 pressed, smooth and glabrous, or the basal ones papillose-hirsute ; blades 4-30 cm. long, 

 3-10 mm. wide, smooth or roughish, papillose-hirsute above near the base : racemes 2-13, 

 spreading or ascending, 4-9 cm. long, the rachis straight, 2-2.5 mm. wide, broadly 

 winged : spikelets in pairs and often so crowded as to appear in four rows, frequently red- 

 brown, broadly obovate, 2-2.3 mm. long, 1.5-1.8 mm. broad, the 2 outer scales smooth and 

 glabrous, the first 5-nerved, the second 3-nerved, the flowering scale faintly pitted in close 

 longitudinal lines, deep brown at maturity. [P. purpurascens Ell.] 



In meadows and moist places, North Carolina to Florida and Mississippi. Summer and fall. 



34. Paspalum plicatulum Michx. Stems tufted, flattened, 4-8 dm. tall : leaf- 

 sheaths compressed, smooth and glabrous ; blades usually folded, at least when dry, more 

 or less long-hairy above, erect, rather stiff, 2 dm. long or less, 2-5 mm. wide : racemes 

 3-7, rarely fewer, spreading or ascending, 3-7 cm. long : spikelets brown at maturity, 

 elliptic, 2.5-3 mm. long and about 1.8 mm. wide, the first scale 5-nerved, the lateral 

 nerves approximate, more or less pubescent with appressed hairs, the second scale glabrous, 

 3-nerved, the margins usually more or less transversely plicate, the third scale seal-brown 

 at maturity. 



In dry, usually sandy soil, Georgia and Florida to Texas. Also in Mexico, South America and the 

 West Indies. Spring to fall. 



35. Paspalum diffdrme Le Conte. Stems 5-10 dm. tall, rather stout, leafy below, 

 not tufted : leaf-sheaths somewhat compressed, the external basal ones, as well as some- 

 times the summit of the others, papillose-hirsute ; blades erect or nearly so, commonly 

 less than 1.5 dm. long, 6-10 mm. wide, flat, glabrous or hirsute above and sometimes more 

 or less so below : racemes 2 or 3, ascending, short, commonly 4-6 cm. long : spikelets usu- 

 ally singly disposed, or rarely some of the central ones in pairs, 3-3.5 mm. long and about 

 2. 6 mm. broad, the 2 outer scales 3-nerved, glabrous. 



In low grounds, Georgia and Florida. Summer. 



36. Paspalum altissimum LeConte. Stems usually 5-8 dm. tall, rarely taller, slen- 

 der : leaf-sheaths hirsute with rather short hairs ; blades short-hirsute on both surfaces, 

 commonly less than 2 dm. long, 3-6 mm. wide : racemes generally in pairs, 5-8 cm. long, 

 ascending : spikelets usually singly disposed, sometimes in pairs, "about 3.5 mm. -long and 

 2.5 mm. wide, the 2 outer scales glabrous, 3-nerved. 



In dry pine lands, Alabama and Mississippi. Fall. 



