XIV. CRUCIFER^E. 



227 



larger, variously imbricate in bud. Glands sessile at the base or on the circum- 

 ference of the torus, usually 4, opposite to the sepals, or 2 or 6, or forming a con- 

 tinuous variously lobed ring, sometimes 0. STAMENS hypogynous, 6, of which 2 are 

 short, and opposite the lateral sepals, and 4 longer facing the placentary sepals, 

 and close together in pairs, or coherent ; sometimes reduced to 4 or 2 (Lepidium 

 (some), Capsella (some), Senebiera (some)), rarely oo (Megacarpcea polyandra) ; fila- 

 ments subulate, the longest sometimes 1 -toothed, or arched, rarely dilated or appen- 

 daged (Lepidostemon) ; anthers 2- (very rarely 1-) celled (Atelanthera) , introrse, 

 dehiscence longitudinal, basifixed, cordate or sagittate, sometimes linear (Parryci) or 

 twisted (Stanley a). OVARY of 2 connate carpels (very rarely 8-4, Tetrapoma), placed 

 right and left of the floral axis, sessile, rarely stipitate (Warea, &c.), placentation 

 parietal, usually 2-celled by cellular plates springing from the placentas, and dilated 

 into a false vertical septum ; sometimes 1 -celled, with parietal, basilar or apical placen- 

 tation ; sometimes divided into several superimposed cellule* by spongy transverse 

 septa (Raphanus} ; style simple, or dilated, or appendaged, below the stigmas ; stigmas 

 2, opposite to the placentas, erect or divergent, or united into one, sometimes decur- 

 rent on the style ; ovules oo, or few or solitary, pendulous or horizontal, very rarely 

 solitary and basilar in the 1-celled ovaries (Clypeola, Dipterygium), or apical (Isatis, 

 Tauscheria, Euclidium), campylotropous orhalf-anatropous, raphe ventral, and micro-, 

 pyle superior. FRUIT elongated (siligua], or short (silicula), usually 2-celled, or 1- 

 celled from arrest of the septum (Isatis, Clypeola, Calepina, Myagrum, &c.), usually 

 with 2 valves separating from the placentas, rarely with 3-4 valves (Tetrapoma), 

 sometimes indehiscent from the cohesion of the valves (Raphanus), rarely transversely 

 divided into 2 one- or more-seeded joints, of which the upper (Erucaria, Morisia, &c.), 

 or the lower (Crambe, Rapistrum, Cakile, Enar thro carpus} is indehiscent. SEEDS sub- 

 globose or margined or winged ; testa cellular, usually becoming mucilaginous when 

 moistened. EMBRYO oily, curved, very rarely straight (Leavenworthia), exalbuminous 

 or very rarely enveloped in a layer of fleshy albumen (f satis, some) ; cotyledons sub- 

 aerial, usually plano-convex, aceunibent (Pleurorhizece) or inciimbeiit (Notorhizece) 

 relatively to the radicle (which is usually ascendent), rarely oblique, sometimes 

 folded in two along their length and embracing the radicle (Orthoplocece), rarely 

 linear, and folded twice transversely (Biplecolobece), very rarely linear and coiled 

 transversely upon themselves (Spirolobece). 



TRIBE I. ORTHOPLOCE^, D.G. 

 Cotyledons longitudinally conduplicate, -embracing the dorsal radicle. 



PRINCIPAL GENERA. 



* Sinapis. 

 Diplotaxis. 

 Morisia. 



Eruca. 

 Vella. 

 Rapistrum. 



* Brassica. 

 Moricandia. 

 EnarthrocarpUH. 



Hirschfeldia. 

 Calepina. 



Erucastrum. 

 * Crambe. 

 Kaphanistrum. 



Q 2 



