3JJ 



ond, five nerved; third, live to seven-nerved, acute to acuminate, larger 

 than the perfect flower. Sterile flower with 3 stamens. Widely diffused 

 and quite variable. The Atlantic form has spikelets about 1J lines 

 long. The Western form has spikelets about 2 Hues long, the glumes 

 acuminate. A form on the Atlantic coast has the panicle quite close 

 aud rather oblong, and may be called variety conferta; another form 

 (var. elougata) has a very long and narrow panicle, with spikelets even 

 2£ lines long. 



Maine to Florida, and throughout the interior of the country. 



62. P. Havardii, Vasey. (P. virgatum var. macrospermum, V.). — With 

 the habit of western forms of P. virgatum, but much stouter; culms 

 5 to G feet high, with rigid, involute, long-pointed, glaucous leaves, li- 

 gule a ring of short hairs; panicle 1£ feet long, diffuse, the branches 

 less abundantly flowered ; spikelets 3 lines long ; lowest glume one half 

 as long as the spikelet, prominently five to seveu-nerved; second 

 glume nine-nerved, ovate, acuminate; third glume five to seven-nerved, 

 its thick palet nearly as long ; fertile flower about one-fourth shorter 

 than the spikelet. 



Guadaloupe Mountains, Texas; Dr. Havard, G. G. Nealley. 



Section VII.— Frutescentes. 



63. P. divaricatum, Linn. — Shrubby, smooth ; culms 6 to 8 feet high 

 with short and spreading branches ; leaves lanceolate, acuminate, 2 to 

 4 inches long, 2 to 6 lines wide, deciduous from the persistent sheaths ; 

 panicles terminating the branches, 1 to 3 inches long, nearly simple or 

 branched, the branches rather distant and diverging, half to 1 inch long ? 

 rather sparsely subdivided; spikelets smooth, 2 lines long, tumid, obo- 

 vate, nodding, on pedicels as long or longer ; lower glume triangular- 

 ovate, one-third as long as the spikelet; second and third glumes as long 

 as the spikelet, very broad, nine to eleven nerved ; apex of tlie fertile 

 flower downy-tipped. 



Southern Florida. 



Section IX. — Villifloka. 



64. P. Urvilleauurn, Kth. — Culms 1 J to 2 feet high, from a strong 

 running root-stock, the whole plant densely soft-hairy ; near the base 

 short-jointed and covered with weather-worn leaves or sheaths; leaves 

 rigid, 12 to 18 inches long, 3 lines wide at the base, becoming con- 

 volute, aud ending in a long, setaceous point, the upper ones exceeding 

 the panicle, which is 6 to 10 inches long, open, but rather contracted, 

 the branches semi-verticillate or scattered, the shorter ones flowering 

 to the base ; the longer ones (3 to 4 inches long) racemosely subdivided 

 and flower bearing towards the ends or throughout; spikelets 2J to 3 

 lines long, ovate, acute; the empty glumes silky- villous; lower glume 

 seven-nerved, two-thirds as long as the fifteen-nerved second glume j 

 third glume rather shorter, eleven to thirteen-nerved ; perfect flower 

 oblong, glabrous, except on the margins, which are long-ciliate. 



In sand, southern California to Arizona. 



