266 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Pods quadrangular by the thick- 

 ening of the midribs of the 

 valves. 

 Plants glabrous; cauline leaves 



clasping 29. Conringia (p. 288). 



Plants pubescent; cauline 



leaves not clasping 23. Cheirinia (p. 281). 



Pods terete or nearly so, the midrib 

 wanting or but little thick- 

 ened. 



Petals conspicuously lobed 28. Dryopetalon (p. 288). 



Petals not lobed. 

 Leaves, at least some of them, 

 twice pinnately dis- 

 sected 27. Sophia (p. 286). 



Leaves not twice pinnate. 



Seeds in two rows 24. Radicula (p. 283). 



Seeds in one row. 

 Glabrous perennial with 



creeping rootstock. . .25. Schoenocrambe (p. 285). 

 Plants pubescent with 

 simple or branched 

 hairs (one species 

 glabrous annual), 

 without rootstocks. . .26. Sisymbrium (p. 285). 



Selenia dissecta Torr. probably grows in the southeast corner of the State. The 

 type locality is in western Texas very near the New Mexican boundary. 



1. THYSANOCARPUS Hook. 



Slender annual with flattened disk-shaped wing-margined 1-celled pods, the wing 

 perforated or toothed like a cogwheel. 



1. Thysano carpus amplectens Greene, Pittonia 3: 87. 1896. 



Type locality: Southwestern New Mexico. Type collected by Greene, April 16, 

 1880. 



Range: Known only from the type locality. 



2. STANLEY A Nutt. 



Stout perennial herbs with entire or pinnatifid leaves; flowers rather large, in elon- 

 gated racemes, crowded in bud; calyx narrow, spreading; petals long-clawed, yellow; 

 anthers linear or curved, the filaments elongated; silique subterete, elongated, long- 

 stipitate. 



KEY TO THE SPECIES. 



Blades of the petals linear-oblong to elliptic; flowers bright yellow. . 1. S. arcuata. 

 Blades of the petals rounded-oval; flowers ochroleucous 2. S. albescens. 



1. Stanleya arcuata Rydb. Bull. Torrey Club 29: 232. 1902. 



Type locality: Unionville Valley, Nevada. 



Range: Wyoming and California to northwestern New Mexico. 



New Mexico: Western San Juan County. Dry hills and plains, in the Upper 

 Sonoran Zone. 



