CRUCIFERAE (MUSTARD FAMILY) 



10 CARDAMINE. 



1 a Basal leaves oval ; flowers about V<2 in. broad 



BULBOUS CRESS. (C. bulbbsa.) 

 b Basal leaves divided ; flowers about ^4 in. broad .... 2 



2 a Pods spreading; segments of leaves usually oval or 



obovate WOOD BITTER-CRESS. (C. ftexubsa.) 



b Pods erect or ascending; segments of leaves usually 



oblong or linear 3 



3 a Plant branched, about i ft. or more high 



PENNSYLVANIA BITTER-CRESS. (C. pennsylvdnica.) 

 b Plant not branched, very slender, usually less than i ft. 



high SMALL-FLOWERED BITTER-CRESS. (C. parviflbra.) 



11 DENTARIA. 



i a Stem leaves usually 3 ; leaflets lanceolate 



PEPPER-ROOT. (D. laciniata.) 

 b Stem leaves usually 2; leaflets ovate 



CRINKLEROOT. (D. diphylla.) 



12 BURSA SHEPHERD'S PURSE. (B. bursa-pastbris.) 



13 CAMfiLINA FALSE FLAX. (C. satlva.) 



14 DRABA. 



i a Leaves all basal; petals 2-cleft. WHITLOW GRASS. (D. verna.) 

 b Leaves not all basal ; petals not cleft 



CAROLINA WHITLOW GRASS. (D. caroliniana.) 



15 STENOPHRAGMA MOUSE-EAR CRESS. (S. thaliana.) 



1 6 ARABIS. 



1 a Plant cultivated in gardens for the flowers 



ALPINE ROCK-CRESS. (A. alpina*) 

 b Plants not cultivated in gardens 2 



2 a Pods usually less than 2 in. long, erect or spreading. . 3 

 b Pods more than 2 in. long, recurved or pendulous. ... 4 



3 a Basal leaves deeply pinnatifid; pods spreading 



LYRE-LEAVED ROCK-CRESS. (A. lyrata.) 

 b Basal leaves not pinnatifid; stem leaves clasping; pods 



erect HAIRY ROCK-CRESS. (A. hirsiita.) 



4 a Stem leaves with clasping bases; pods recurved 



SMOOTH ROCK-CRESS. (A. laevigata.) 

 b Stem leaves not with clasping bases; pods pendulous 



SICKLE-POD. (A. canadensis.) 



17 ERYSIMUM WORM-SEED MUSTARD. (E. cheioranthoUes.) 



18 ALtSSUM. 



i a Leaves ^4-i in. long, linear-oblong 



YELLOW ALYSSUM. (A. alyssoldes.) 

 b Leaves 1-2 in. long, oblanceolate to ovate 



GOLDEN-TUFT. (A. saxdtile*) 



19 K6NIGA SWEET ALYSSUM. (K. maritima*) 



20 BERTER6A HOARY ALYSSUM. (B. incana.) 



21 HfiSPERIS DAME'S VIOLET. (H. matronalis*) 



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