Mustard Family 165 



Pods short, never twice as long as broad except in Draba. 

 Pods compressed parallel with the partition. 



Pods many-seeded. 18. DRABA 



Pods 2-seeded. 24. KONIG. 

 Pods compressed contrary to the partition. 

 Pods many-seeded. 



Pods heart-shaped. 17. BURSA. 



Pods elliptic. 16. HUTCHINSIA. 



Pods 2-seeded. 5. LEPIDIUM. 



** Pods indehiscent. 



Pods of 2 indehiscent cells. 15. DITHYREA. 

 Pods 1-celled, 1-seeded, orbicular. 



Pods winged. 20. THYSANOCARPUS. 



Pods wingless. 19. ATHYSANDS. 

 Pods elongated jointed. 9. RAPHANUS. 



1. STANLEY A Nutt. 



Mostly tall erect branching glabrous and glaucous 

 perennial herbs, with entire toothed or pinnately divided 

 leaves and large yellow bractless flowers in elongated 

 terminal racemes. Sepals linear, narrow. Petals nar- 

 row, long-clawed. Stamens 6, nearly equal ; anthers 

 twisted. Ovary short, stipitate ; style short or none. 

 Siliques linear, long-stipitate, spreading or recurving, 

 somewhat compressed, dehiscent ; the valves strongly 

 1-nerved. Seeds in 1 row in each cell. Cotyledons 

 straight. 



1. S. pinnata (Pursh) Britton. Stems stout, 15-25 dm. high ; 

 lower leaves pinnatifid or pinnately divided or rarely entire, 

 12-20 cm. long, 2-8 cm. wide, long-petioled ; upper leaves similar 

 or less divided or oblong-lanceolate and entire, short-petioled ; 

 flowers numerous, yellow; petals 16-24 mm. long; filaments Ali- 

 form exserted ; siliques 5-8 cm. long, on stipes about % as long. 



Occasional on the dry plains and foothills of all our interior valleys. 



2. THELYPODIUM Endl. 



Erect annual or biennial herbs, glabrous or somewhat 

 pubescent with simple hairs. Leaves entire, toothed or 

 pinnatifid. Flowers racemose or subspicate, purplish or 

 whitish. Siliques nearly terete, linear, short-stipitate or 

 sessile ; valves 1-nerved, dehiscent ; style short ; stigma 

 nearly entire. Seeds in 1 row in each cell, oblong, mar- 

 ginless. Cotyledons incumbent. 



