22 CEucrFERE. (mustard family.) 



Order 5. FUMARIACEiE. 



Tender herbs with dissected compound leaves, and irregular hypogynona flowera, the 

 parts in twos, except the 6 diadelphous stamens. 



1. DICENTRA, Borkh. 



Sepals 2, small and scale-like, sometimes caducous. Corolla of two pairs of petals, 

 flattened and cordate; the outer pair the larger and sacked at the base, the tips spreading; 

 the inner, spoon-shaped, lightly united at the apex, inclosing the anthers and stigma. 

 Stamens in two sets, 3 before each of the outer petals, filaments slightly cohering. 

 Style slender; stigma 2-lobed, each lobe sometimes 2-crested. 



1. D. formosa, DO. Leaves radical, and the compound racemes of rose-colored 

 flowers borne on naked scapes. 



2. D. chrysantlia, Hook. & Am. The flowers in long terminal paniculate racemes 

 on leafy stems; corolla narrow, scarcely cordate, golden yellow. 



Order 6. CRUCIFER-ffi. 



Herbs with pungent watery juice. Sepals 4. Petals 4, with blade narrowed into a 

 claw, the lamina spreading to form a cross, rarely wanting. Stamens 6, two of them 

 inserted lower down on the receptacle and shorter than the other four. Ovary 2-celled 

 by a thin partition, rarely 1 -celled. Leaves alternate, and flowers usually in racemes 

 without bracts. 



Since a careful examination of the fruit is usually necessary for the determination of 

 species in this difficult order, only such plants as have large flowers or remarkable fruit 

 are here described. 



§ 1. Pod dehiscent, 2-valved. 



* Pod elongated, compressed parallel with the partition; seeds flat. 



Pctioled leaves, lobed or divided; root tuberous Cardamine. 1 



Stem leaves sessile, entire; root perpendicular. 



Flowers purple Arabis. 2 



Flowers orange Cheiranthus. 3 



Flowers yellowish Erysimum. 4 



* * Pod terete; seeds globose. 

 Flowers Yellow Brassica. 5 



* * * Pod flattened contrary to the partition. 



Pod linear; flowers axillary, yellow Tropidocarpum. 6 



Pod obcordate; flowers minute Capsella. 7 



Pod obovate, 2- winged at the top Lepidium. Q 



