322 BRASSICACEAE 



Capsule globose, indehiscent, 1-2-seeded. 13. Nesi.ia. 

 tt Pod long, several times as long as broad. 



* Pod scarcely beaked, merely tipped by a short style or a sessile 

 stigma. 

 i Pod terete or nearly so. 



Pubescence of simple hairs. 



Seeds in two rows in each cell of the pod. 



Seeds globose or oblong, turgid; valves of the pod nerve- 

 less; cotyledons accumbent. 

 Petals with a median nectary, usually yellow. 



15. RADICUL.A.. 



Petals without nectary, white. 16. Sisymbrium. 

 Seeds flattened; valves of the pod 1-nerved; cotyledons 

 partly incumbent. 17. TURRlTis. 



Seeds in 1 row in each cell of the pod. 



Pod subulate, tapering from the base to the apex. 



18. Ery.simum. 

 Pod cylindric or tapering both ways. 

 Perennials with creeping rootstocks. 



46. SCHOENOCRAMBE. 



Annuals, or perennials with taproots. 



Septxun of the pod nerved, with longitudinal 



reticulations. 19. Nort.\. 



Septum of the pod nerveless, with transverse 

 reticulations. 20. Braya. 



Pubescence of forked hairs. 



Flowers pedicelled, yellow to straw-colored, rarely white; 



leaves pinnatifld or lobed. 21. Sophi.a. 



Flowers sessile, rose or white; leaves toothed or entire. 



22. RIalcolmia. 

 H Pod 4-angled. 



Stem-leaves clasping by a cordate base. 23. Conringia. 

 Stem-leaves not clasping. 



Corolla white. 24. Arabidopsis. 



Corolla yellow or purplish. 



Seeds plump; leaf-blades entire or toothed. 



Hairs of the stem and leaves appressed, 2-branched, 

 attached near the middle; partition of the pod not 

 cross-veined. 25. Cheirinia. 



Hairs of the stem and leaves spreading, branched, 

 attached at the end; partition of the pod cross- 

 reticulate. 26. HE.SPERIS. 

 Seeds flat; leaf-blades pinnatifld. 27. Campe. 

 ** Pod with a long distinct beak. 



Pods indehiscent, constricted between the seeds, which are separ- 

 ated from each other by false, spongy, transverse partitions. 



28. Raphanus. 

 Pods opening by valves, without transverse partitions. 



Beak flat and sword-like, 4-angled, or two-edged, contiguous 

 with an internode, containing 1 seed. 

 Valvesof the pod with 3 strong nerves. 29. Sinapis. 

 Valvesof the pod with 1 strong nerve. 30. Eruca. 

 Beak elongated-conic, seedless. 31. Brassica. 



b. Pod flattened parallolly to the broad partition. 



Fruit orbicular, 1-celled, 1-seeded, indehiscent; sepals somewhat spreading. 

 Fruit not winged; pubescence of branched hairs, those of the fruit 



uncinate. 32. Athysanus. 



Fruit winged, usually marked with fenestrations or sinuations on the 

 margin ; pubescence of simple hairs. 33. Thysanocarpus. 



Fruit 2-celled, 2-several-seeded, dehiscent (in some species of Draba 

 tardily so) ; sepals erect. 

 Pod orbicular. 



Valves convex; filaments dilated and toothed near the base; plants 

 stellate, leafy. 

 Pod suborbicular, with flat margins; petals entire or nearly so. 



34. ALY.SSUM. 



Pod oblong, slightly if at all compressed ; petals notched. 



35. Berteroa. 

 Valves flat; filaments not toothed; plant scapose, with simple hairs. 



36. IDAJIOA. 



Pod oblong, ovate or linear, rarel.v nearly orbicular; valves flat, or if 

 convex not with flattened margins; filaments unappendaged. 

 Valves nerveless. 



Valves elastically dehiscent; seeds in one row; pod long. 



Stem naked below, 2-3-leaved; cotyledons thick, very un- 

 equal. 37. Dentaria. 

 Stem leafy; cotyledons fiat, equal. 38. Cardamine. 

 Valves not elastically dehiscent; seeds in two rows; pod usually 

 short. 39. Draba. 

 Valv&s nerved and reticulate, not elastically dehiscent. 



