

XIV. CEUCIFEE^E. 220 



dons incumbent, straight or coiled, or transversely folded. Schizopetal/um, Hesperis, 

 Malcolmia, Streptoloma, Sisymbrium, Conringia, Erysimum, Heliophila,, &c. 



TRIBE IV. CAMELINE^E. Siliqua short or long, oblong, ovoid or globular. Seeds 

 2-seriate. Cotyledons incumbent. Stenopetalum, Braya, Camelina, Tetrapoma, 

 Subularia, &c. 



TEIBE V. BRASSICE^E. Siliqua short or long, dehiscent throughout its length, 

 or at the top only. Cotyledons folded longitudinally. Brassica, Sinapis, Erucas- 

 trum, Hirschfeldia, Diplotaxis, Eruea, Moricandia, Vella, Carrichtera, Suceovia, &c. 



Series B, Siliqua short, dehiscent throughoiit its length. Valves continuous 

 within, very concave, compressed in a direction perpendicular to the plane of the 

 septum. Septum usually very narrow. 



TRIBE VI. LEPIDINE^B. Cotyledons incumbent, straight or bent, or condupli- 

 cate longitudinally, or coiled upon themselves. Capsella, Senebiera, Lepidium, 

 jfflthionema, Gampyloptera, &c. 



TRIBE VII. THLASPIDE^E. Cotyledons accumbent, straight. Oremolobus, Bis- 

 cuteila, Megacarpcea, Thlaspi, Iberis, Teesdalia, Hutchinsia, Iberidella, &c. 



Series C. - Siliqua short (rarely long), indehiscent, not jointed, often crustaceous 

 or bony, 1-celled, 1- (rarely 2-) seeded, or 2-4-celled with parallel 1-seeded cells. 

 Pedicels often very slender, drooping in fruit. Seed often furnished with a thin 

 albumen ; testa not mucilaginous. 



TRIBE VIII. ISATIDE^E. Characters of the series. Peltaria, Clypeola, Tsatis, 

 Tauscheria, Nestia, Calepina, Myagrum, Euclidium, Bunias, Zilla, &c. 



Series D. Siliqua transversely 2-jointed, short or long ; lower joint indehiscent, 

 empty or longitudinally 2-celled, 2- oo-seeded ; upper joint indehisceut, 1-celled, 

 1-seeded,, .or 2- oo-celled, with parallel or superimposed cellules. Siliqua always 

 upright or nearly so, pedicel straight. 



TRIBE IX. CAKILINE^E. Characters of the series. Crumbe, Huricaria, Rapis*- 

 trum, Cakile, Enarthrocarpus, Erucaria, Morisia, ,&c. 



Series E. Siliqua long, not jointed, indehiscent, cylindric or moiiiliforiii, 1- 

 celled, many-seeded, or with several 1-2-seriate, 1-seeded cellules, separating when 

 ripe. 



TRIBE X. EAPHANE^E. Characters of the series. Raphanus, Raffenaldia, 

 Anchonium, Parlatoria, &c. 



A Cruciferous flower is not strictly symmetrical in relation to the floral axis. The arrangement of 

 the calyx and corolla at first appears to follow the quaternary type, four sepals alternating with four 

 petals ; but the slightest examination shows that the two antero-posterior sepals are inserted lower than 

 the two lateral ; the petals, however, evidently form a single whorl. The exceptional structure of the 

 andrcecium has given rise to many contradictory theories. The two lateral stamens are shorter and lower 

 than the other four, which are in pairs, and alternate with the two lateral. It is these two pairs of long 

 stamens which have especially exercised the sagacity of botanists. De Candolle, and after him Seringe, 

 Saint-IIilaire, Moquin-Tandon, and Webb, admit the quaternary type for the calyx and corolla, and 

 extend it equally to the andrcecium, where, according to them, each pair of long stamens represents a 



