256 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



13. CLEMATIS L. Virgin's bower. 



Perennial, more or less woody vines; flowers small, numerous, paniculate, dioecious 

 or the pistillate with a few sterile stamens; sepals petal-like, white, thin, spreading; 

 petals wanting. 



KEY TO THE SPECIES. 



Tails of the carpels 7 to 10 cm. long; panicle with few (usually less 



than 10) flowers; leaflets small, 30 mm. long or less 1. C. drummondii. 



Tails of the carpels 4 cm. long or less; panicle many-flowered; 

 leaflets 35 to 70 mm. long. 

 Leaflets loosely pubescent on both surfaces, acute, never long- 

 attenuate, the lobes coarsely crenate with obtuse teeth; 



achenes attenuate to the tails 2. C. neomexicana. 



Leaflets usually entirely glabrous, mostly long-attenuate, the 

 lobes incised with acute teeth or entire; achenes abrupt- 

 ly contracted into the tails 3. C. ligusticifolia. 



1. Clematis drummondii Torr. & Gray, Fl. N. Amer. 1: 9. 1838. 

 Type locality: Texas. 



Range: Texas to Arizona, south into Mexico. 



New Mexico: Tortugas Mountain; Organ Mountains; Otis. Dry hills and canyons, 

 in the Lower Sonoran Zone. 



The native name is "barba de chivo." 



2. Clematis neomexicana Woot. & Standi. Contr. U. S. Nat. Herb. 16: 122. 1913. 

 Type locality: San Luis Mountains, New Mexico. Type collected by E. A. 



Mearns (no. 2136). 



Range : Southwestern New Mexico and adjacent Arizona and Mexico. 



New Mexico: San Luis Mountains; Organ Mountains. Dry canyons in the moun- 

 tains, Upper Sonoran Zone. 



3. Clematis ligusticifolia Nutt.; Torr. & Gray, Fl. N. Amer. 1: 9. 1838. 

 Type locality: "Plains of the Rocky Mountains." 



Range: British America to California and New Mexico. 



New Mexico: Common, except on the plains of the eastern part of the State. 

 Lower and Upper Sonoran zones. 



Clematis orientalis L. (Clematis crux-flava Cockerell J ) is sometimes cultivated in 

 New Mexico, and is reported to have escaped near Las Vegas. The nature of the 

 plant is such, however, that it is not likely to become a permanent part of our flora. 



14. VIOBNA Reichenb. Leather flower. 



Herbaceous or woody perennials with erect or climbing stems; leaves pinnate; flow- 

 ers large, solitary on long peduncles, usually nodding; sepals thick, erect, mostly dull 

 purple; petals none; anthers linear. 



KEY TO THE SPECIES. 



Stems herbaceous, erect; plants mostly 1-flowered. 



Sepals conspicuously dilated at the apex; plants permanently vil- 

 lous 1- V. eriophora. 



Sepals not dilated; plants glabrate in age. 



Plants stout; leaf segments large, 20 to 40 mm. long 2. V. scottii. 



Plants slender; leaf segments small, 5 to 15 mm. long 3. V. bakeri. 



1 Science n. ser. 10: 898. 1899. 



