MUSTARD FAMILY 



239 



VII. Cakilinae. 



Pods 2-jointed, the upper joint at length deciduous; seeds 1 in a joint. 



Introduced weed; leaves clasping. 



VIII. ISATIDINAE. 



IX. Brassicinae. 



18. Cakile. 



19. I sat is. 



20. Eruca. 



21. Sinapis. 



22. Brassica. 



23. Diplotaxis. 



24. Raphanus. 



Beak of the pod more or less strongly flattened. 



Valves 1-nerved, the nerve prominent. 



Valves 3-nerved; beak often containing a seed. 

 Beak of the pod conical, not flattened, seedless. 



Pods terete; seeds in 1 row in each cell. 



Pods somewhat flattened; seeds in 2 rows in each cell. 



X. Raphaninae. 

 Pods indehiscent, 1-celled, the spaces between the seeds filled with spongy tissue. 



XI. Cardamininae. 



Pods linear, more or less turgid. 



Valves 1-nerved; flowers yellow except in two species of Rorippa. 



Seeds in 1 row in each cell; pods somewhat 4-sided. 25. Barbarea. 



Seeds in 2 rows in each cell; pods terete. 26. Rorippa. 



Valves nerveless; flowers white, often showy. 



Stems leafy, not arising from tuberous roots. 27. Cardamine. 



Stems arising from tuberous roots, bearing 2 or 3 leaves below the inflorescence; basal leaf often remote 

 from the stem on an elongated subterranean petiole. 28. Dentaria. 



Pods suborbicular, strongly flattened parallel with the partition; stems scapose, 1 -flowered. 



XII. Schizopetalinae. 



Racemes leafy; pods broadly linear, compressed contrary to the partition. 



XIII. Physariinae. 



Pods emarginate at apex or more or less didymous. 

 Pods merely emarginate at apex, lyre-shaped. 

 Pods more or less didymous. 



Pods strongly didymous and flattened; seeds solitary in each cell. 

 Pods didymous but more or less inflated; seeds 2 or more in each cell. 

 Pods rounded to acute at apex; seeds several in each cell. 

 Pods nearly as broad as long, generally inflated. 

 Pods lanceolate, several times longer than broad; strongly compressed parallel 



XIV. Capsellinae. 



Pods dehiscent. 



Flowers white; pods compressed. 



Pods compressed contrary to the partition. 



Pods elliptic; valves with a prominent midrib. 

 Pods cuneate to triangular-obcordate. 

 Pods compressed parallel with the partition. 

 Flowers yellow; pods turgid. 

 Pods indehiscent. 



Flowers yellow; pods strongly reticulated, not winged. 

 Flowers white; pods not strongly reticulated. 

 Pods not winged. 



Pods 1 -seeded, not twisted. 

 Pods several-seeded, twisted when mature. 

 Pods broadly winged, the wings often perforated. 



29. Idahoa. 



30. Tropidocarpum. 



31. Lyrocarpa. 



32. Dithyrea. 



33. Physaria. 



34. Lesquerella. 

 with the partition. 



35. Phocnicaulis. 



36. Hutchinsia. 



37. Cap sella. 

 40. Draba. 



38. Camelina. 



39. Neslia. 



41. Athysanus. 



42. Heterodraba. 

 A3. Thysanocarpus. 



XV. TURRITINAE. 

 Pods terete or nearly so. 



Plants stellate-pubescent; leaves pinnate. 44. 



Plants glabrous or sparsely pubescent below with simple hairs; leaves entire or merely 



45. 



Pods flattened parallel with the partition. 46. 



Smelowskia. 



toothed. 

 Turritis. 



Arabis. 



XVI. Erysiminae. 



Perennials with more or less showy yellow flowers; pubescence of 2-forked hairs. 



XVII. Alyssinae. 

 Flowers white; pubescence of 2-forked hairs. 



Flowers yellow; pubescence of stellate hairs. 



XVIII. Hesperidinae. 



Leaves serrate; stigma lobes small, flat. 

 Leaves entire; stigma lobes larger, corniculate. 



47. Erysimum. 



48, 

 49. 



50. 

 51. 



Koniga. 

 Alyssum. 



Hesperis. 

 Matthiola. 



Leaves clasping; glabrous. 



XIX. MORICANDIINAE. 



52. Conringia. 



