CRUCIFERAE (MUSTARD FAMILY) 207 



broadly- obovate, usually acute: corolla cream-color or white; the spur straight 

 and nearly twice as long as the body: capsule short-oval to oblong, obtuse, 

 refiexed on the! ascending pedicels. (C. brdchycarpum Rydb. Bull. Toi*. Bot. 

 Club 34: 426. 1907.)— South|West Colorado to Utah.' ' 



48. CRUCIFERAE B. Juss. Mustard Family 



Annual, biennial, or perennial herbs, sometimes with woody base, with 

 watery acrid or pungent sap. Leaves alternate. Flowers perfect, racemose 

 or corymbose. Sepals 4, deciduous. Petals 4, or rarely wanting, alternating 

 with the sepals. Stamens 6, tetradynamous. Tardy only 2 or 4; the two outer 

 shorter, opposite the inner sepals. Ovary 2-celled by a septum which stretches 

 across from the placentae, rarely 1-celled; style undivided or wanting; 

 stigma entire of;2-lobed. Fruit a capsule, often greatly elongated, techni- 

 cally called a silique * or,' if short, a silicle. ''The two valves (in most cases) 

 fall away from the partition or septum, which persists and is often known aa 

 the replum. Seeds attached to both sides of the septum. 



Silique dehiscent, i, e., tbe two valves separate from the septum at 

 maturity. , 

 Silique borne on a long' stipe . . . . . . . .1. Stanleys. 



Silique sessile on the receptacle,. or very short-stipitate. 



Snique linear or oblong, at least three times longer than broad. 

 Mature silique loiie-linear (mor'e than 2 cm,). 

 Silique flattenea parallel to the septum. 



Pubescence branched or st^ellate . , . , .. . 23. Arabis. r: 

 Pubescence wanting or simple . . , . . 5, S'treptanthus. 



Silique' terete' or 4-angled, slightly flattened if at all. 

 Flowers yellow, large. , - ' 



Silique 4Tangled; plant roughish-pubescent , . 24. Erysinium, 



Silique terete; plant glabrous 2. Schoeiiocrambe. 



Flowers not yellow; silique terete or nearly so. 



Petals With crisped iiiargin; stem succulent ... 4. Oaulanthus. ' ' 

 Petals flat; fstem not fleshy . . . .... . 3. Thelypodium, 



Mature silique short-lineai* or. oblong Cless than 2 cm.). ' , , . 



Flowers white or purple. 



Plants glabrous . > . 13.> Cardamine. • i 



> ; Plants, pjubesqent..,. |, ■ 



Leaves entire or toothed , 22. Stenophragma, 



' Leaves pin'natifid' ' . 20. Smelowskia. ' 



! Flowers! yellow; - 



. , Leaves dissected, . , : i •., » • • * * . 21. Sophia. 

 Leaves lyrateiy broad-lobed, ' 



Silique distinctly beaked by the persistent style . 9. Brassica. 

 Silique beakless. _ . .j . . . . 



Seeds in 2 rows, , Sat 11. Barbarea. 



Seeds in 1 row, globose or oblong . . . . 12. Rdripa. 

 SiliQue' short; rarely more than twice as long as it is broad. 

 ' : Silique twin, each cell much inflated, subglobose , . . 14. Physaria. 

 , Silique globose or oblong, not twin. 



Scarcely flattened, nearly circular in cross section. 



Flowers white; siUque pear-shaped 18. Camelina. 



Flowers yellow; silique globose or ellipsoid . . .15. Lesquerella. 



Silique flattened parallel to the septum 19. Draba. 



Silique flattened at right'an'gles to the narrow septum, 

 Silique triaiigular-obovate or obcordate. 

 ii' , Radical leaves pinoatifid; silique cuneate . , , 17. Capsella. 



'Radical leaves, entire or merely toothed ... 8. Thlaspi. 

 Silique' elliptic or oval. 



Small aquatib annuals .....'. 



Terrestrial plants. 



Seeds several in each cell 



Seeds solitary in each cell , . , 



Silique indehiscent, i. e., the valves not separating from the septum 



even at maturity . . ... . . . .10. Raphanus. 



* For convenience the term alique baa been used to designate the fruit in this family 

 iu> matter what its shape. 



6. Subularia. 



16. Hutchinsia. 



7. Lepidium. 



