. The Canadian field-naturalist. 464 The Canadian Field-Naturalist Vol. 108 Podistera macounii (Coult. & Rose) Mathias & Const. (Ligusticum mutellinoides (Crantz) Willar ssp. alpinum (Ledeb.) Thell.) — YUKON: sparse alpine heath, Richardson Mts., 66°37'N 136°15'W, R. Frisch, 18 June 1978 (DAO); on W side of west- ernmost range, windswept turfy tundra and moist meadow valley, Richardson Mts., 66°55'N 136°08'W, Cody & Ginns 31009, 8 July 1982 (DAO); turfy scree slope, Richardson Mts., 65°59'N 135°22'W, Cody & Ginns 30245, 5 July 1982 (DAO). Hulten (1968) depicted this endemic spe
. The Canadian field-naturalist. 464 The Canadian Field-Naturalist Vol. 108 Podistera macounii (Coult. & Rose) Mathias & Const. (Ligusticum mutellinoides (Crantz) Willar ssp. alpinum (Ledeb.) Thell.) — YUKON: sparse alpine heath, Richardson Mts., 66°37'N 136°15'W, R. Frisch, 18 June 1978 (DAO); on W side of west- ernmost range, windswept turfy tundra and moist meadow valley, Richardson Mts., 66°55'N 136°08'W, Cody & Ginns 31009, 8 July 1982 (DAO); turfy scree slope, Richardson Mts., 65°59'N 135°22'W, Cody & Ginns 30245, 5 July 1982 (DAO). Hulten (1968) depicted this endemic species as occurring eastward in Alaska to about longitude 143°W. Welsh (1974) stated that it occurred in northern Yukon and adjacent Mackenzie and Douglas et al. (1981) stated "Dempster Highway north of the Arctic Circle to the north slope of the Richardson Mountains", but neither cited any speci- mens. Seven specimens from the northern Richardson Mts., of Yukon are preserved in the Vascular Plant Herbarium (DAO); the specimens cited above extend the known range to the southern part of the Richardson Mountains. Podistera yukonensis Mathias & Constance — YUKON: talus slope on bedrock knob of Chert Mtn., Ogilvie Mts., Tombstone Range, alt. 7500 ft., 64°24'N 138°53'N, Kennedy 93A-239, August 1993 (DAO). This rare endemic described by Mathias and Constance (1950) had previously only been collected three times, once in Alaska near Eagle, and twice in the Yukon Territory at Little Klondike River (type locality) and Mile 58 on 60 Mile Road near the Alaska-Yukon boundary {Calder & Gillett 26337 (DAO); Hulten 1967). The collection cited above was obtained about 50 km north of the type locality. In addition to herbarium material, Calder and Gillett also collected living material at Mile 58 that was taken to Ottawa. A chromosome count of 2«=22 was determined by R. J. Moore on this material, but was apparently never reported in the literature (Figure 1).
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