GRAMINE^E. 41 



NAIADACE.E. t 



POTAMOGETON PECTINATUS, Linn. Sp. 127. Hamors' Lake, 

 north of Durango, 24 July, n. 499. 



TRIGLOCHIN PALUSTRE, Linn. Sp. 338. Hamors' Lake, 

 24 July, n. 501. 



TRIGLOCHIN MARITIMUM, Linn. Sp.339. Trimble Springs, 

 near Durango, 26 July, n. 476. 



ALISMACE^:. 



ALISMA PLANTAGO AQUATICA, Linn. Sp. 342. Lower La 

 Plata Canon, 11 July. Specimens poor, just beginning to 

 flower, n. 1127. 



GRAMINEJE. 



By S. M. Tracy. 1 



PANICUM VIRGATUM, Linn. Sp. 59. Occasional on rail- 

 way embankment near Trimble Springs, Colo., n. 962. 

 The only Panicum seen on the expedition. 



PHALARIS ARUNDINACEA, Linn. 1. c. 55. Abundant along 

 Hamors' Lake, and occasional in wet places near Trimble 

 Springs, n. 918. 



ARISTIDA PURPUREA, Nutt. Trans. Am. Phil. Soc. v. 145. 

 On dry hills about Durango, n. 974. 



A. PURPUREA HOOKERI. With the type, but also at 

 lower altitudes, n. 973. 



STIPA COM AT A, Tr. & Rupr. Mem. Acad. Petr. Ser. 6, 

 vol. v. 75. Rocky slopes in West Mancos Canon, 7,000 to 

 9,000 feet, n. 358. 



STIPA NELSONII, Scrib. Bull. Dep. Agr. xi. West Mancos 

 Canon, and also at Poncho Pass, n. 954. 



Done by Dr. Tracy in 1899 ; amended and brought to date by E. k. 

 Greene, January, 1901. 



