22 CRUCIFERJS. (MUSTARD FAMILY.) 



ORDER 5. FUMARIACEJE. 



Tender herbs with dissected compound leaves, and irregular hypogynous flowers, the 

 parts in twos, except the 6 diadelphous stamens. 



1. DICBNTRA, 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; 

 tho 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, DC. Leaves radical, and the compound racemes of rose-colored 

 flowers borne on naked scapes. 



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

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



ORDER 6. CRUCIFER^E. 



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 

 Bpecies 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 Choiranthus. 3 



Flowers yellowish. Erysimum. 4 



* * Pod terete; seeds globose. 

 Flowers Yellow. Brassica. 5 



* * * Pod flattened contrary to the partition. 



Pod linear; flowers axillary, yellow Tropidocarptim. 6 



Pod obcordate; flowers minute Capsella. 7 



Pod obovate, 2-winged at the top Lopidium. 8 



