XIV. CRUCIFER^. 227 



larger, variously imbricate in bud. Glands sessile at tbe 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), Gapsella (some), Senebiera (some)), rarely oo [Megaearjpcea 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 {Parrya) or 

 twisted {Stanley a)'. Ovaet of 2 connate carpels (very rarely 3-4, 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 cellules 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 co, or few or solitary, pendulous or horizontal, very rarely 

 solitary and basilar in the 1-eelled ovaries {Glypeola, Dipterygium), or apical {Isatis, 

 Tauscheria, Uuelidium) , campylotropousorhalf-anatropous, raphe ventral, andmici'o- 

 pyle superior. Fkuit elongated (siliqua), or short {silicula), usually 2-celled, or 1- 

 celled from arrest of the septum {Isatis, Clypeola, Galepina, 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 {Grambe, Rapistrum, Gahile, Enarthrocarpus) is indehiscent. Seeds sub- 

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

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

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

 aerial, usually plano-convex, accumbent {Pleurorhizew) or incumbent {Notorhizem) 

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

 folded in two along their length and embracing the radicle {Orthoplocem), rarely 

 linear, and folded twice transversely {Diplecolobew), very rarely linear and coiled 

 transversely upon themselves {Spirolobece).' 



Teieb I. ORTHOFLOGEm, B.C. 

 Cotyledons longitudinally conduplicate, embracing the dorsal radicle. 



PEINCIPAIi GENERA. 

 •Brassica. Hirschfeldia. Enicastrum. 



Moricanclia. Galepina. * Crambe. 



Enarthrocarpus. * Raphanus. Eaphani.strum. 



O 2 



