35 



Thelypodiuin sagittatum ssp saqittatum 

 (Nutt.) Endl. ex Walpers 



SPECIES INFORMATION 



A. CLASSIFICATION 



1. SCIENTIFIC NAME: Thelypodium saqittatum ssp 

 saqittatum 



2. COMMON NAME: Slender Thelypody 



3. FAMILY: Brassicaceae 



4. GENUS: According to Hitchcock and Cronquist (1964) 

 there are about a dozen species in western North 

 America, chiefly in the desert region, often on 

 alkaline soil (Greek thelys , female, and podion, 

 little foot, referring to the (often) stipitate 

 ovary.) There are seven genera of Thelypodium that 

 occur in the northwestern portion of the United 

 States. 



5. SPECIES: Thelypodium saqittatum ssp saqittatum if 

 found in moist, often alkaline meadows that usually 

 dry by midsummer. 



B. PRESENT LEGAL OR OTHER FORMAL STATUS 



1. BUREAU OF LAND MANAGEMENT: Thelypodium ssp 



saqittatum is proposed as a sensitive species for 

 the Dillon Resource Area. Documentation of it on 

 BLM lands in this study provides basis for 

 recommending that its proposed status is 

 appropriate. 



2. STATE: Thelypodium ssp saqittatum is currently 

 listed by the Montana Natural Heritage Program as 

 "critically imperiled because of extreme rarity (5 

 or fewer occurrences, or very few remaining 

 individuals) , or because of some factor of its 

 biology making it especially vulnerable to 

 extinction" (state rank = SI) . Documentation of it 

 on BLM lands in this study and in the Tendoy 

 Mountains (Vanderhorst and Lesica, in progress) 

 provide basis for recommending that its MTHP rank 

 be changed to S2 . 



C. DESCRIPTION 



1. GENERAL NONTECHNICAL DESCRIPTION: Thelypodium 

 saqittatum ssp saqittatum is a biennial with 

 distinct auriculate stem leaves. The mature fruits 



