. The Canadian field-naturalist. Natural history. 306 The Canadian Field-Naturalist Vol. 115 This species was known to Cody (1996) in the Yukon Territory from only two sites on the arctic mainland coast. Stipa hymenoides Roem. & Schult. {Oryzopsis hymenoides (Roem. & Schult.) Ricker, Achnatherum hymenoides (Roem. & Schult.) Barkworth), Indian Ricegrass (Figure 1) - YUKON: widespread on sandy eroding slope beside hydro dam growing with Stipa comata, Elymus calderi and Penstemon gor- manii, Schwatka Lake Dam, Whitehorse, 60°'N 135°'W, B. Bennett 99-499, 26 Aug. 1999 (DAO, B
. The Canadian field-naturalist. Natural history. 306 The Canadian Field-Naturalist Vol. 115 This species was known to Cody (1996) in the Yukon Territory from only two sites on the arctic mainland coast. Stipa hymenoides Roem. & Schult. {Oryzopsis hymenoides (Roem. & Schult.) Ricker, Achnatherum hymenoides (Roem. & Schult.) Barkworth), Indian Ricegrass (Figure 1) - YUKON: widespread on sandy eroding slope beside hydro dam growing with Stipa comata, Elymus calderi and Penstemon gor- manii, Schwatka Lake Dam, Whitehorse, 60°'N 135°'W, B. Bennett 99-499, 26 Aug. 1999 (DAO, B. Bennett Herbarium). This is a North American species, which is common in southcentral and southeastern British Columbia and is found eastward to southwestern Manitoba and south to Texas, New Mexico, Arizona, California and Mexico. It is new to the Yukon Territory and may be introduced in this area because it is adjacent to the old tramway which passed by the Whitehorse Rapids. It is, however, growing beside species which are endemic or rare in the Yukon. Its assocation with a natural habitat suggests that it is native and there is a prece- dent for widespread southern prairie species on south-facing slopes in the Yukon Territory. Stipa hymenoides may be sep- arated from S. richardsonii as follows: A. Awns 16-60 mm long, persistent; lemmas 5-6 mm long, pubescent with hairs about 1 mm long 5. richardsonii A1. Awns 3-6 mm long, deciduous; lemmas subglobose to fusiform, mm long, pubescent with hairs to 6 mm long S. hymenoides Stipa nelsonii Scribn. ssp. dorei Barkworth & Maze, Columbian Needlegrass - YUKON: stabilized dunes, Carcross Dunes, 60°'N 134°'W, B. Bennett 99-355, 27 Aug. 1999 (DAO). Cody (1996) knew this species from only six locations in southern Yukon Territory. At the site reported above over 50 plants were observed. CYPERACEAE Carex aenea Fern., Bronze Sedge - YUKON: sandy silt riverbank, La Biche River, 60°13'58"N 124°13'58"W,
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