448 CRUCIFER. 
pous or campylotropous ; style none (fig. 892), or very short ; 
stigmas 2 (fig. 893), opposite the placentas. Fruit a siliqua (figs. 
682 and 893), or silicula (figs. 714, 894, and 895), 1- or 2-celled, 
1- or many-seeded. Seeds stalked, generally pendulous (jigs. 
893 and 894) ; embryo with the radicle variously folded upon the 
cotyledons (figs. 776, 777, 778, 896, and 897) ; albwmen none. 
Diagnosis.-—Generally ebracteated herbs. Inflorescence in- 
definite ; racemose or corymbose. Sepals and petals 4, deciduous, 
regular, the latter cruciate. Stamens tetradynamous. Ovary 
with two parietal placentas ; stigmas 2. Fruita siliqua or silicula. 
Seeds stalked, without albumen, and with the radicle variously 
folded upon the cotyledons. No other order is likely to be con- 
founded with this of ordinary care be taken, as tetradynamous sta- 
mens only occur here, eacept in a very few plants belonging to the 
order Capparidacee. 
Fic. 890. Fic. 891. 
Fig. 890. Diagram of a Cruciferous flower.—Fig. 891. Portion of the 
flowering branch of the Wallflower. 
Division of the Order and Illustrative Genera.—This large and 
truly natural order has been divided into sub-orders according 
to the nature of the fruit, and also as to the mode in which the 
embryo is folded. ‘The latter is the most natural arrangement. 
The sub-orders founded on the nature of the fruit are as 
follows :— 
Sub-order 1. Siliquose.—Fruit a siliqua (fig. 682), opening by 
valves longitudinally. Illustrative Genera :—Cheiranthus, 
Linn. ; Brassica, Linn. 
Sub-order 2. Siliculose latisepte —Fruit a silicula opening by 
valves ; the replum in its broader diameter (fig. 895). Illus- 
trative Genus :—Cochlearia, Linn. 
Sub-order 3. Siliculose angustisepte.—Fruit a silicula opening 
