77 



ti. Panicum dicJiotomnm, L. — By streams of the Santa Catalina 



Mountains. 



12. Panicum Colonurti, L., Sp. PL, 2nd ed., p. 84. — Santa Cruz 



Valley, near Tucson. 



13. Paniami Crus-GalH, L., Sp. PL, 2nd ed., p. 84.— Santa Cruz 



Valley, near Tucson. 



14*. SeiaHa caudaia, R. cS.' S., Syst., ii., 495 ; Vasey, Bot. Wheeler 

 Exped., p. 295 ; S. setosa, P.B., var. caudaia, Griseb., Flor, Br. W. 

 Ind., p. 555.— Pantano, Arizona. June. 



15. Cenchrus tribuloides, L., Sp. PL, ist ed., p. 1,049.— Santa 



Cruz Valley, near Tucson. 



16. Lecrsia oryzoides, Sw., Flor. Ind.Occ, i., 132 (in adnot.).-Santa 



Cruz River. 



17. ' Polypogon Monspeliensis, Desf., AtL, i., 66 ; Gray's Manual, p. 



612.— Banks of the Santa Cruz River. 



18. Polypogon elons;atus, HBK., Nov. Gen., i., 134 ; C. Gay, Flor. 

 ChiL, vi., p. 301; Steud., Syn. Gram., 183.— Culm simple, erect, genic- 

 ulate at the lower joints, 2-3 feet high, smooth, 4-5 leaved, the dark 

 colored joints contracted ; sheaths smooth, the lower equalling the 

 upper, shorter than the internodes ; ligule of the upper leaf 2-3 Imes 

 long, obtuse, broader than the leaf, and decurrent along the sheath ; 

 leaves broadly linear, smooth below, very scabrous on the niargms 

 and on the nerves above (3-4 lines broad, the upper one 6 inches 

 long), involute near the tips, and terminating in a sharp, scabrous 

 point. Panicle i to i foot long (9 inches in Pringle's specimens), 

 narrow, and rather densely flowered, nodding ; the erect, or some- 

 what loosely spreading branches in dense, half-whorled clusters, the 



shorter ones flower-bearing to the base, the longer ones (2 inches 



long) naked below, much branched, and flower-bearing above_ the 

 divisions and sub-divisions, being curiously arranged in little fascicles 

 or umbels of threes and fours ; pedicels 2-3 lines long, strongly scab- 

 rous, clavate. Glumes empty, slightly unequal, the lower longer, lance- 

 olate, awn-pointed, about i^ lines, or, including the awn, 2-3 lines long, 

 round and scabrous on the back, aculeolate on the single nerve ; 

 flowering glumes I as long as the e.mpty glumes, thm, oblong, broadly 

 obtuse or truncate and irregularly 5-toothed at the tip, with a slender, 

 straight, scabrous awn on the back, above the middle, about i line 

 long ; palea half as long as its glume, irregular at the broad truncate 



By streams of Santa Rita Mts., Arizona. (467.) 

 Both Gay and Steudel make Nowodworskia agrostotdes, 1 resl., 

 Rel. Haenk., L, t. 40, a synonym of this. There is a single specimen 

 of the same species without name, in herb. Acad. PhiL, collected by 

 C Mohr in Mexico. On the ticket is written: " near Mublenbergta 

 distuhophyUa, says Thurber." So far as I know, this plant has not 

 before been recorded as growing within our limits. 



19. Hilaria cenckrotdes, HBK., Nov. Gen., i-, t. 37 ;. Vasey, «ot. 



Wheel 



stolonifi 



Acad. Phil.— Mesas, near Camp Lowell. July. 

 No. 846 of P:. Hall's Texan plants is the same. 



F. LaMSON SCRIBNER. 



