. The Canadian field-naturalist. Notes A Notable Range Extension for the Globally Rare Endemic Plant, Cryptantha shackletteana Higgins, in East-central Alaska Carl A. Roland' and Mary B. Cook Wrangell St. Elias National Park and Preserve, Box 439 Copper Center, Alaska 99573, USA 11697 Red Fox Drive, Fairbanks, Alaska 99709, USA Roland, Carl A., and Mary B. Cook. 1998. A notable range extension for the globally rare endemic plant, Cryptantha shackletteana Higgins, in East-central Alaska. Canadian Field-Naturalist 112(1): 158-160. A new location in the Mentasta Mountains, Alaska,
. The Canadian field-naturalist. Notes A Notable Range Extension for the Globally Rare Endemic Plant, Cryptantha shackletteana Higgins, in East-central Alaska Carl A. Roland' and Mary B. Cook Wrangell St. Elias National Park and Preserve, Box 439 Copper Center, Alaska 99573, USA 11697 Red Fox Drive, Fairbanks, Alaska 99709, USA Roland, Carl A., and Mary B. Cook. 1998. A notable range extension for the globally rare endemic plant, Cryptantha shackletteana Higgins, in East-central Alaska. Canadian Field-Naturalist 112(1): 158-160. A new location in the Mentasta Mountains, Alaska, is reported for Cryptantha shackletteana, a globally rare endemic known previously from two localities on the Yukon River in Alaska. The new locality is 240 km to the southwest of the Yukon River sites, and is located in a different physiographic province; the Alaska Range. The new locality suggests that this plant was formerly more widespread in Alaska than it is today. Key Words: Cryptantha shackletteana, Cryptantha spiculifera, rare plants, endemic species, range extension, Alaska. A floristic inventory of the Nabesna River valley in Wrangell-St. Elias National Park and Preserve, conducted during June 1996, resulted in the discov- ery of three populations of the narrowly restricted plant Cryptantha shackletteana Higgins. This species is listed as globally rare by the Alaska Natural Heritage Program (Global Rank: Ql, State Rank: 1) and as a Species of Concern by the U. S. Fish and Wildlife Service (R. Lipkin, personal com- munication). Previously, it was known from the type locality at Eagle, Alaska, and one other site in close proximity on the Yukon River, 240 kilometers north- northeast of the new locality (Figure 1). The discov- ery in the Nabesna River valley is significant because it extends the range of this species into the Alaska Range, a physiographic province in which it was not previously known or expected to occur. The new localities also broaden our concept
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