Part 3, 1915] POACEAE 221 



29. Panicum stramineum Hitchc. & Chase, Contr. U. S. Nat. Herb. 



15: 67. 1910. 



Plants ascending or widely spreading, sparingly branching at the base and lower nodes, 



or simple, 20-50 cm. high; culms glabrous, the nodes appressed- villous; leaf-sheaths glabrous, 



sparsely papillose or papillose-hispid; blades erect or ascending, 10-30 cm. long, 4-15 mm. 



wide, rounded or somewhat cordate at base, glabrous or sometimes sparsely papillose-pilose, 



scabrous on the margin and sometimes on the upper surface, sometimes ciliate at base ; panicles 



finally exserted, one fourth to one third the entire height of the plant, ovoid in outline, rather 



many-flowered, the pedicels scarcely as appressed as in P. hirticaule; spikelets 3.2-3.7 mm. 



long, 1.5 mm. wide, elliptic, abruptly acuminate, turgid, pale-stramineous; first glume one third 



the length of the spikelet, blunt or subacute, the nerves usually anastomosing; second glume 



and sterile lemma equal, or the glume slightly shorter, not much exceeding the fruit, the palea 



of the sterile floret as long as the fruit, 2-nerved; fruit 2.2 mm. long, 1.3 mm. wide, obovate- 



elliptic, turgid, a rather prominent scar on either side at base. 



Type locality: Guaymas, Sonora. 

 Distribution t Arizona to Guerrero. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 50. 



30. Panicum sonorum Beal, Grasses N. Am. 2: 130. 1896. 



Panicum capillare miliaceum Vasey; Vasey & Rose, Contr. U. S. Nat. Herb. 1: 28. 1890. Not 

 P. miliaceum L. 1753. 



Plants robust, erect or spreading, 60 cm. to more than 1 meter high; culms glabrous or 



sparsely papillose-hispid, the nodes pubescent; leaf -sheaths papillose-hispid or nearly glabrous; 



blades 15-40 cm. long, 15-30 mm. wide, cordate-clasping at base, rather prominently nerved, 



glabrous or sparsely papillose-hispid; panicles large and more or less drooping, 2O--30 cm. long, 



densely flowered, the numerous branches narrowly ascending; spikelets 3-3.3 mm. long, 1,1 mm. 



wide, lanceolate, strongly nerved, brownish; first glume half to two thirds the length of the 



spikelet, acuminate ; second glume slightly exceeding the sterile lemma, the palea of the sterile 



floret wanting; fruit 2.1 mm. long, 1 mm. wide, oblong-obovate, subacute. This species may 



be a cultivated form of Panicum hirticaule. 



Type locality: Lerdo, Sonora. 

 Distribution: Northwestern Mexico; Chiapas. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 52. 



31. Panicum parcum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 



68. 1910. 



Plants sparingly branching from the middle or upper nodes; culms 30-50 cm. high, slender, 



erect or somewhat geniculate at base, glabrous ; leaf-sheaths rather sparingly papillose-hispid, 



glabrate toward the base; ligule 1-2 mm. long; blades ascending, rather thin, linear, elongate, 



10-30 cm. long, 2-6 mm. wide, slightly narrowed to the base, acuminate, sparsely pilose on both 



surfaces or glabrate, more or less ciliate; panicles short-exserted, the terminal 10-20 cm. long, 



half to two thirds as wide (the axillary smaller), few-flowered, the few, slender, but not capillary, 



flexuous branches solitary, remote, ascending, bearing ascending or appressed branchlets with 



scattered, rather long-pediceled spikelets; spikelets about 6 mm. long, 1.8 mm. wide, turgid, 



acuminate-pointed; first glume about half the length of the spikelet, pointed; second glume 



longer than the sterile lemma, both exceeding the fruit and pointed beyond it, the sterile palea 



about half as long as its lemma; fruit 3.3 mm. long, 1.4 mm. wide. 



Type locality: I,odiego, Sinaloa. 

 Distribution: Sinaloa to Guerrero. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 53. 



32. Panicum miliaceum L. Sp. PI. 58. 1753. 



Milium Panicum Mill. Gard. Diet. ed. 8. Milium no. 1. 1768. 



Milium esculentum Moench, Meth. 203. 1794. 



Panicum Milium Pers. Syn. PI. 1: 83. 1805. 



Panicum asperrimum Fisch.; Jacq. f. Eclog. Gram. 46. 1820. 



Plants erect or decumbent at base, usually branching from the basal nodes, 20 cm. to as 

 much as 1 meter high; culms stout, hispid below the pubescent nodes or glabrous; leaf-sheaths 



