b. BUREAU OF LAND MANAGEMENT: 



Cypripedium calceolus was named as a prospective 

 sensitive plant taxa ("SPT") in the 1991 BLM draft 

 list of sensitive plants, which is currently under 

 review. In light of the 1992 survey work, a 

 designation change for Cypripedium calceolus will 

 be recommended, placing it in the category for 

 possibly extirpated species. 



c. U.S. FOREST SERVICE: Cypripedium calceolus is 

 currently included on the list of sensitive plant 

 species for Region 1 (Northern Region) of the U.S. 

 Forest Service, known from the Bitterroot, Flathead, 

 Kootenai and Lewis and Clark National Forests. 



It is not known but suspected to occur on the 

 Lolo National Forest, which is closest to the 

 Anderson Hill site. 



2. STATE: Cypripedium calceolus is currently listed by the 



Montana Natural Heritage Program (1992) as restricted and 

 vulnerable but recurrent in the state (state rank = S2S3). 

 This is based on 34 records from 10 counties (including the 

 Anderson Hill record) . Some of the records represent large 

 populations. The current rank was lowered from S2 despite 

 the apparent loss of the Anderson Hill population, the only 

 known case of extirpation. 



C. DESCRIPTION 



1. GENERAL NONTECHNICAL DESCRIPTION: Cypripedium calceolus is a 

 showy dainty perennial herb that grows 6-16 inches tall 

 (Figure 3) . The lower lip petal is a distinctive yellow 

 pouch ("slipper") with an opening in the upper surface. It 

 is often purple-speckled, and is less than 2 inches long for 

 C. c. var. parviflorum . The other petal-like parts of the 

 flower (petals + sepals) are long and narrow. They are 

 glossy deep red to yellowish green, with or without 

 mottling, as described in Hitchcock and Cronquist (1984) . 

 The solitary yellow flowers of this species are subtended by 

 an erect leafy bract which appears much like the elliptic 

 stem leaves. The stem leaves are 2-7 inches long and barely 

 sheath the stem. The stems grow singly or more often in 

 clumps with many stems. The foliage is lightly pubescent and 

 usually glandular. The fruit is an elliptic capule bearing 

 many thousands of tiny seeds. In Montana, the plants are 

 generally in flower from late May to early June, but the 

 Anderson Hill specimen was in full flower late on 25 June 

 1924. This might be explained by the fact that the Anderson 

 Hill site is over 1500 feet higher in elevation than other 

 known Montana sites. 



2. TECHNICAL DESCRIPTION: Stems 1.5-4 dm tall, sparsely 



