CRUCIFER.E. (MUSTARD FAMILY.) 63 



+- -i- Pod linear (or oblong or even globular in n. 11). 

 ** Cotyledons accumbent. 



11. Nasturtium. Pod often short; valves strongly convex, nerveless. Seeds small, in 



2 rows in each cell. Flowers yellow or white. 



12. Barbarea. Pod somewhat 4-sided ; valves strongly 1-uerved. Seeds in 1 row. Flowers 



yellow. 



++ ++ Cotyledons incumbent or partially so. 



13. Hesperis. Pod terete, elongated ; stigma-lobes narrow, erect. Flowers large, purple. 



14. Erysimum. Pod 4-sided ; valves strongly 1-nerved ; stigma broadly 2-lobed. Pu- 



bescence of appressed 2-3-parted hairs. Flowers yellow. 



15 Sisymbrium. Pod angled or teretish ; valves 1-3-nerved; stigma small. Flowers 

 yellow or white, small. 



1C. Thelypodium. Pod teretish ; valves 1-nerved ; stigma entire. Cotyledons ob- 

 liquely incumbent. Flowers rose-color. Leaves auricled. 

 ++++++ Cotyledons conduplicate. 



17. Brassica. Pod beaked or pointed beyond the end of the valves, or tipped with a 



rigid style, nearly terete, or 4-sided. Flowers yellow or whitish. 



Pod short; the boat-shaped valves conduplicate or much flattened contrary to the 



narrow partition. Flowers white. 



15. Capsella. Pod many-seeded, obcordate-triangular, wingless. Cotyledons incumbent. 



19. Thlaspi. Pod several-seeded, obovate or ubcordaU-, winged. Cotyledons accumbent. 



20. Lepiclium. Pod 2-seeded, flat, scale-shaped. Cotyledons incumbent or accumbent. 



21. Seiiebiera. Pod 2-seeded, didynimis ; the valves rugose, separating at maturity from 



the little partition as 2 closed 1-seeded nutlets. Cotyledons incumbent, narrow. 



SERIES II. Pods indehiscent, continuous or transversely jointed; joints 



1 -celled. 



22. Cakile. Pod short, 2-jointed ; jnints 1-seeded. Cotyledons plane, accumli ut. 



23. Raphanus. Pod elongated, several-seeded, continuous, or constricted between the 



seeds and moniliforni. Cotyledons conduplicate. 



1. S EL EN I A, Kutt. 



Pod large, oblong-elliptical, flat; the valves nerveless. Seeds in 2 rows in 

 each cell, rounded, broadly winged; cotyledons accumbent; radicle short. 

 A lu\v animal, with once or twice pinnatitid leaves and leafy -bracteate racemes 

 of yellow flowers. (Name from o-eAirjj/Tj, the moon, with allusion to Lunaria, 

 which it somewhat resembles in its pods.) 



1. S. aurca, Xutt. Lobes of the simply pinuatifid leaves entire or toothed ; 

 pod ' long, ou elongated spreading pedicels, beaked by the long slender style. 

 Mo. and Kau. to Tex. 



2. LEAVENWORTHIA, Torr. 



Pod broadly linear or oblong, flat ; the valves nerveless, but minutely re- 

 ticulate-veined. Seeds in a single row in each cell, flat, surrounded by a thick 

 wing. Embryo straight! or the short radicle only slightly bent in the direc- 

 tion which if continued would make the orbicular cotyledons accumbent. 

 Little winter annuals, glabrous and often stemless, with lyrate leaves and short 

 1 - few-flowered scape-like peduncles. (Named in honor of the late M. C. 

 Leavemvorth.) 



1. L. MichatlXii, Torr. Scapes 2-6' high; leaf -lobes usually numer- 

 ous (7-15); petals purplish or nearly white with a yellowish base, obtuse: 



