286 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. Sisymbrium officinale leiocarpum DO. Prodr. 1: 191. 1824. Hedge mustard. 

 Type locality: "In Carolina merid. et Teneriffa." 



New Mexico: Gilinores Ranch (Wooton & Standlcy 3642). 



A common introduced weed in many parts of North America, still rare in New 

 Mexico. 



4. Sisymbrium altissimum L. Sp. PI. 659. 1753. 

 Type locality: ''Habitat in Italia, Gallia, Siberia." 

 New Mexico: San Juan Valley. 



A native of Europe, widely introduced into the United States, a noxious weed in 

 the Northwest. 



27. SOPHIA Adans. Tansy mustard. 



Annuals, more or less stellate-pubescent; leaves once, twice, or thrice pinnately 



parted into mostly small segments; flowers small, in terminal racemes; petals usually 



yellow, white in one species; racemes elongated in fruit; siliques from one-half to one 



and one-half times the length of the pedicels; seeds in apparently one row in some 



species, really from alternate funiculi from two lateral placentae in each cell, mostly 



in two evident rows. 



key to the species. 



Petals white; leaves nearly all thrice pinnately parted 1. *S. ochroleuca. 



Petals yellow; leaves mostly once or twice pinnately parted. 



Plants appearing glabrous, really sparingly stellate-pubescent, 

 green. 

 Pedicels erect, like the pods, seemingly appressed to the 



rachis 2. S. procera. 



Pedicels divergent; pods erect or curved. 



Inflorescence glandular-pubescent; pods longer than 



the pedicels 3. S. incisa. 



Inflorescence merely sparingly stellate-pubescent, 



not glandular ; pods shorter than the pedicels. . 4. S.serrata. 

 Plants canescent, thickly and persistently stellate-pubescent, 

 grayish green. 

 Plants tall, 80 to 120 cm.; segments of the leaves large, 

 some of them obtuse; sepals yellow. 

 Inflorescence glandular-pubescent, not canescent. . . 5. S. adenophora. 

 Inflorescence canescent with stellate hairs, like the 



rest of the plant 6. S. obtusa. 



Plants lower, 30 to 60 cm. high; leaf segments mostly very 

 small; sepals purplish. 

 Plants slender, sparingly branched; inflorescence 



glabrous 7. 5. glabra. 



Plants stout, much branched ; inflorescence glandular 

 or stellate-pubescent. 

 Plants divergently much branched from the base; 

 inflorescence strongly glandular, not stel- 

 late-pubescent; petals equaling the sepals. 8. S. halictorum. 

 Plants with more erect stems; inflorescence stel- 

 late-pubescent, sometimes sparingly glan- 

 dular; petals longer than the sepals 9. S. andrenarum. 



1. Sophia ochroleuca Wooton, Bull. Torrey Club 25: 455. 1898. 

 Type locality: Mesilla Park, New Mexico. Type collected by J. D. Tinsley. 

 Range: Southern New Mexico, probably also in adjacent Arizona and Mexico. 



