Part 3, 1915] POACBAB 211 



first glume about one third the length of the spikelet, obtuse or truncate, 3-nerved; second 

 glume slightly shorter than the fruit and sterile lemma, strongly 5-7-nerved, obscurely reticu- 

 late; fruit 1.8 mm. long, 1-1.1 mm. wide, elliptic, abruptly acute, minutely rugose, the margins 

 of the lemma inrolled only at base. 



Type} locality: Florida. 



Distribution: Southern Florida and the Bahamas. 



Illustration: Contr. U. S. Nat. Herb. 15: /. 3. 



4. Panicum ramisetum Scribn. Circ. U. S. Dep. Agr. Agrost. 27: 9. 



1900. 



Panicum subspicatum Vasey, Bull. U. S. Dep. Agr. Bot. 8: 25. 1889. Not P. subspicatum Desv. 

 1831. 



Plants pale-green, tufted, from short horizontal rootstocks; culms erect or ascending, 

 25-60 cm. high, commonly branching at the base and lower nodes, scabrous at least below the 

 nodes; leaf-sheaths nearly as long as the internodes or the lower overlapping, not compressed, 

 sparingly papillose-pilose, especially along the margins and at the summit; Hgule about 1 mm. 

 long, with longer hairs at the sides; blades rather firm, erect or ascending, 5-12 cm. long, the 

 lower shorter and more spreading, 2-4 mm. wide, tapering to an involute tip, not narrowed at 

 base, but about as broad as the sheath, sparsely papillose-pilose on both surfaces, at least 

 toward the base, sometimes sparsely ciliate; panicles very slender, 5-20 cm. long, not conspicu- 

 ously interrupted, their branches erect, the ultimate branchlets of 1-4 subsessile spikelets, the 

 setiform prolongation of the axis usually not exceeding the short-pediceled spikelet; spikelets 

 2.4-2.6 mm. long, 1.4—1.5 mm. wide, obovate, subacute, turgid, plano-convex; first glume 

 clasping, about half the length of the spikelet, subacute or acute, 5-nerved; second glume and 

 sterile lemma subequal, scarcely covering the fruit at maturity, strongly 7-9-nerved; fruit 2.2- 

 2.3 mm. long, 1.4 mm. wide, elliptic, acute. 



Type locality: Texas. 



Distribution: Southern Texas and adjacent Mexico. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 355; Contr. U. S. Nat. Herb. 15: /. 5. 



5. Panicum Reverchoni Vasey, Bull. U. S. Dep. Agr. Bot. 8: 25. 



1889. 



Plants tufted from short rootstocks, branching at the base; culms stiffly erect, 30-70 cm. 

 high, simple or occasionally bearing one or two sterile branches, slender, subcompressed.. gla- 

 brous or the lower internodes strigose, the nodes appressed-pubescent ; leaf-sheaths mostly 

 longer than the internodes, ciliate on the margin toward the summit, otherwise glabrous, often 

 slightly scabrous, or the lowermost sometimes sparsely strigose; ligule about 0.3 mm. long; 

 blades erect, stiff, 5-20 cm. long, 2-3 mm. wide, flat, or involute toward the apex and base (the 

 blades of the basal shoots commonly involute-setaceous), scabrous on both surfaces, especially 

 the upper, at the base narrower than the sheath, the lower commonly disarticulating at this 

 point; panicles long-exserted, very slender, 5-20 cm. long, the branches scattered, short, erect, 

 the branchlets bearing 1 or 2 subsessile spikelets, the setiform prolongation of the axis mostly 

 equaling or exceeding the spikelet; spikelets 3.5-3.8 mm. long, 1.8-2 mm. wide, elliptic, turgid, 

 abruptly pointed; first glume about half the length of the spikelet, subacute, strongly 5-7- 

 nerved; second glume and sterile lemma scarcely equaling the fruit, strongly 5-7-nerved; fruit 

 3.1-3.3 mm. long, 1.8-1.9 mm. wide, elliptic, minutely pointed, obscurely transversely rugose. 



Type locality: Texas. 



Distribution: Texas. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 356; Contr. U. S. Nat. Herb. 15: /. 7. 



6. Panicum firmulum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 



27. 1910. 



Plants light olive-green, rather loosely tufted, ascending or decumbent at base, from creep- 

 ing knotted rootstocks as much as 5 cm. long; culms 30-40 cm. high, simple or with a few ap- 

 pressed branches, glabrous, the nodes glabrous or strigose; leaf-sheaths overlapping, striate, 

 papillose-pubescent, papillose only, or nearly glabrous, a tuft of stiff hairs 3 mm. long on the 

 sides at the summit; ligule dense, about 1.5 mm. long; blades ascending or spreading, firm, 



