140 PANICAC'E.B. 



Spikelets smooth, oval or obovate, obtuse, 1.0-i.O mm. long; 

 second and third glumes equal, 5-nerved; Horet Jiispidulous, oval, 

 1.4 mm. long. 



Mexico (San Luis Potosi), Prinfile 3S17, Hourg. 30:55. liott. 

 150, 151, 427. Bel. 390. 



Shady rocky slopes. 



64. P. depauperatum Muhl. (!ram. 112 (ISIT). P. Wikox- 

 ianum Vasey, Bull. 8, U. S. Dept. Agric. iiot. Div. 32 (188!»). 



A tufted perennial; culms slender, simple, erect, branching 

 below, 20-40 cm. high. Sheaths mostly pubescent; blades 3 to a 

 culm, narrowly linear, erect. Hat or involute, beset with long soft 

 hairs. Panicle 3-0 cm. long, simple, contracted on long peduncles, 

 above the leaves or some of them mucli lower. Spikelets mostly 

 acute whei! young, some of them becoming obtuse when mature, 

 oval-ovate or oval-obovat'.'. 2-3.5 mm. long; tirst glume 1-2 mm. 

 long, 1-5-nerved, second 7-10-nerved; iloral glume of tlie neuter 

 spikelet 5-!>-nerved, its palea small; fertile floret oval, smooth, 

 1.7-2.7 mm. long. 



The plant varies much, especially the spikelets. In the above 

 measurement of spikelets the larger is from a plant collected by 

 Dr. Vasey in 1). C, and named by Vasey & Scribner; the snudler 

 is one of the Cooly collection, from Deertield, Mass. 



New York to Texas. Michigan, Wheeler for :M. A. C. 17. lUal 

 18, !'.», Cuoleii for M. .\. C. 20,21; Massachusetts, Shtrtvcant; 

 Texas. Jenneij for Nat. Mus., Xetil/ei/. 



\ar. laxum Vasey. Hull, 'i'orr. Club, l(i:8 (188!)). ''Weaker 

 stemmed; i)anicK' with longer and more spreading branches 

 (1.5-2 inches), the lower ones single or verticillate; s})ikelets 

 smaller." 



Virginia. Florida, Texas. Arkansas, Missouri. 



(>5. P. Vaseyanum Scribn. ined. 



A geniculate puri)lish branching annual. 50-80 cm. high, 

 smooth throughout, except the nnirgins of the blades and the 

 hispid branches of the panicle; nodes light-colored. Sheaths loose, 

 ciliate; ligule very short; blades thin. Hat, 10-15 cm. long. 4-ti 

 mm. wide. Panicles terminal, or wilh two or three lateral, 



