87 



F 



dry and distichous sheaths, 3 feet and more high ; leaves, excepting 

 the upper ones, which are short (1-2 inches), very long (i foot and 

 more) flat, rather stiff or rigid, 4-6 lines wide, above much narrower, 

 and more or less conduplicate below, margin with a narrow, min- 

 utely serrulate, cartilaginous line, apex long-acuminate, with a sharp, 

 stiff point ; ligule short, long pilose. Panicle (in specimens in hand) 

 6-8 inches long, narrow {^-i inch), very woolly, and densely flow- 

 ered ; lower branches erect, i| inch long. Spikelets in pairs (single 

 above), the pedicel of one about one line long, that of the other one- 

 half shorter, densely pilose at the base with long (3-4 lines) silvery- 

 white, silky hairs, with similar hairs on the outer surface of the 

 empty glumes. Empty glumes sub-equal, the upper and larger one 

 1^2 lines long, both 5- or imperfectly 7-nerved, with broad, obtuse, 

 erose or finely ciliate tips, and enclosing three hyaline scales 

 appearing like lodicules ; the outer one, which is supposed to rep- 

 resent a neutral floret without a palea, is lanceolate, obtuse and 

 finely cut at the tip, nearly as long as the empty glumes; the second, 

 supposed to be the fertile glume (lower palet), is like the first, ex- 



cepting that it is a third smaller ; the third scale, supposed to be the 



palea of the perfect flower, is about | of a line long and fully as 

 broad, irregularly and deeply cut-toothed at the tip (sometimes 

 almost regularly 3-5 toothed). This scale surrounds the ovary and 



the one stamen. 



By streams, Santa Catalina Mts. June. It is the same as No. 

 283 of Dnimmond's Texas coll. (vid. herb, Philada. Acad.) 



22. ^ Hcteroto^on contortics, R. & S., Syst., ii., 836. 



H. 



V t 



Andropogon contortus, L. Vasey, In Bot. Wheeler 

 Exped., p. 296. 

 Santa Cruz Valley, near Tucson. (459.) 



23. * Heteropogon contortiis, R. & S., var.— Differs from the last 

 only in having the outer glume of the male flower smooth (not at all 

 pilose), and with but a very narrow-winged, scarious margin. It 

 agrees with descriptions of Heteropogon Alionii, R. & S. {H. gla- 

 brum, Pers.), but it seems too near H. contorhis to be separated 



from it. 



Mesas, near the Santa Rita Mts., Arizona. (460.) 



24. * A}idropos;on Jamesii, Torr., in Marcy's Rep. (1852.) 



= A. glaucum, Torr., in Ann. N. Y. Lye, i., p. 153 (1824.) 

 ^= A. Torreyamis, Steud., Syn. Gram., p. 392 {1854.) 



Santa Cruz Valley, near Tucson. (453-) ^ . , 



Equals No. 845 of E. Hall's Texan Plants ; No. 3,635* Curtiss s 

 Distrib. N. Am. PL; and No. 582 of Brandegee, collected near 

 Canon City, Colorado, referred to A. argenteus. Ell., in Flor. Colo- 

 rado This grass is very closely allied to A. saccharoides, Sw. (vid. 

 Griseb Flor.'^Br. W. Ind.), and perhaps should be united with it. 



25. *Phalaris intermedia, Bosc, in Poir. Encycl. Suppl., 1,, 300; 

 Chapman's Flora of the Southern States, p. 569. 



Santa Cruz Valley, near Tucson. May. 



26. *Aristida Americana, L., Am. Acad., v., 393, 



A. dispersa, var., Trin. & Rupr, 



