RECOVERY PLAN FOR - U.S. Fish and Wildlife Service

(Cuddihy et al. 1983), although it has been damaged subsequently
(C. Corn, pers. comm. 1992). The populations at the other two
sites are sufficiently small that they may be considered relictual
or ephemeral.
The major population at Site #3 was estimated during the 1980-1982
survey to contain 300 plants dispersed over about 1 acre. A
sample of 168 of these plants was measured. The plants ranged
between 7 and 75 centimeters (3 and 30 inches) in height. Since
plants occurred in all height classes, it appeared that the
population was successfully recruiting reproductive plants.
Furthermore, in April 1982, seedlings less than 7 centimeters (3
inches) tall were found under 50 percent of the shrubs at Site #1
(Nagata 1982).
The population and habitat of Isodendrion hosakae at Site #3 was
severely damaged by intensified grazing in 1988. The vegetation
was generally reduced and plants of I. hosakae were broken; at
that time, only 25 to 50 living plants were seen (C. Corn, pers.
comm. 1992). This population was again seen in January 1991, but
no count of plants was made (S. Bergfeld, pers. comm. 1992).
The populations at the other two sites are so small that
population structure analysis is meaningless. In 1980-82, eight
plants were counted at Site #1 in approximately 8 square meters
(86 square feet) (Cuddihy ~ ~1. 1983). Grass fires burned the
habitat of Isodendrion hosakae on this cinder cone in 1983. A few
months after the fire at least one of the plants was observed
alive with green leaves (C. Corn, pers. comm. 1992). Although a
determined search in September 1992 by DOFAW personnel and
botanists from NTBG failed to relocate this plant
(S. Bergfeld, pers. comm. 1992), another plant was spotted about
30 meters (100 feet) away.
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