OP ARTS AND SCIENCES. 123 



— Culms 12 to 18 inches high, with long involute erect leaves, and 

 a short lax panicle : spikelets sometimes 2-, very rarely 3-flowered, 

 S-3h lines long ; empty glumes lanceolate, acuminate ; flowering glume 

 broadly lanceolate, pilose all over, laciniate at apex: awn from near 

 the middle on the back, 2-3 lines long, bent and a little twisted be- 

 low ; rudiment nearly half as long as the floret, pilose : hairs on callus 

 short, one fifth as long as the glume. — Mt. Orizaba, 14,000 ft,> 

 August (no. 227 a). 



Trisetuji elongatum, Kunth, Gram. I. 101, Enum. PI. I. 296, 

 This appears to be the same as T. interruptum, Buckley, and is 

 probably the T. interruptum of Fournier. — Mt. Orizaba, 12,000 ft., 

 August (no. 191). 



Triodia avenacea, HBK. Nov. Gen. loG, t. 48. (Uralepis 

 avenacea, Kth. ; Fourn. Mex. PI. Enum., Gram. 110.) — Mt. Orizaba, 

 9,000 ft., August (no. 248). Equals Pringle's no. 3930 and Schaff- 

 ner's 1008. Spikelets 6-8-flowered, about 4 lines long; empty glumes 

 unequal, the larger second one 2i lines long; first flowering glume 2 

 lines long, oblong, deeply notched at apex, awued between the divis- 

 ions : awn about 1 line long. 



Eragrostis lugens, Nees. S. Wats, in Proc. Am. Acad. XVIII. 

 182. — Hill near Esperanza, 8,000 ft., August (no. 318). Equals 

 Pringle's no. 472. I have this species from Louisiana, collected in 

 cultivated fields at Lafayette by A. B. Langlois, Sept. 25, 1885. 



Festuca Tolucensis, HBK. Nov. Gen. I. 153? — Mt. Orizaba, 

 12,000 ft., August (no. 193). Equals Pringle's no. 5201. This, 

 and also no. 228 of same collection, appear to me to be only varieties 

 of Festuca oi-ina, L. The no. 228 may be Fournier's F. cequipetcda. 



Festuca rubra, L., var. pauciflora, Scribner, n. var. Spike- 

 lets 3-flowered : upper flower imperfect : empty glumes unequal ; the 

 lower shorter and narrower : flowering glumes lanceolate, acuminate, 

 submucronately pointed, scabrous on the back. — Mt. Orizaba, 13,000 

 ft., August (no. 227 b). This may be F. Willdenoviana, Schult., but 

 it appears to be only a variety of F. ruhra^ L. 



Bromus PIookeri, Fourn., var. Schlechtendalii, Fourn. Mex. 

 PI. Enum., Gram. 127. — Mt. Orizaba, 10,000 ft., August (no. 189). 

 Equals Pringle's no. 1173. This has been referred to B. carhiatus, 

 Hook., but upon what authority I do not know. Hooker's species 

 does not appear to be clearly known. 



