CRUCIFERAE (MUSTARD FAMILY) 



21 a Plants 6 in. or less high, with tufted basal leaves i in. 



or less long, entire or toothed 14. Draba. p 159 



b Plants not completely as in a 22 



22 a Flowers violet or purple; cultivated plant 



26. Aubrietia. p 160 

 b Flowers white or greenish 23 



23 a Flowers fragrant, numerous; leaves entire; pods oval 



or circular 19. Koniga. p 159 



b Flowers not fragrant 24 



24 a Plant with a rosette of basal, usually entire leaves 



1-2 in. long, hairy 15. Stenophragma. p 159 



b Plants not completely as in a 25 



25 a Plant covered with forked hairs; leaves %-2 in. long, 



entire 20. Berleroa. p 159 



b Plant not covered with forked hairs 26 



26 a Pods triangular, flattened 12. Bursa. p 159 



b Pods not triangular 27 



27 a Pods apparently double, about l /2 as long as broad, 



rough-wrinkled 2. Coronopus. p 157 



b Pods not completely as in a 28 



28 a Pods oval to circular, flattened i. Lepidium, p 757 



b Pods not completely as in a 29 



29 a Stem leaves linear to lanceolate, usually entire or slightly 



toothed 16. Arabis. p 159 



b Stem leaves usually pinnately divided or the basal ones 



very large 30 



30 a Pods nearly globose, or elongated, spreading, and curved 



upwards 9. Roripa. p 158 



b Pods linear, not completely as in a 10. Cardamine. p 159 

 i LEPIDIUM. 



1 a Stem leaves clasping at the base 



FIELD CRESS. (L. campestre.) 

 b Stem leaves not with clasping bases 2 



2 a Leaves much pinnatifid ; pod winged all around 



GARDEN CRESS. (L. sattvum*) 

 b Leaves only somewhat pinnatifid ; pod winged only at 



apex 3 



3 a Petals present; pod obscurely winged at apex; common 



weed WILD PEPPER-GRASS. (L. virginicum.) 



b Petals usually wanting; pod conspicuously winged at 



apex APETALOUS PEPPER-GRASS. (L. apetalum.) 



2 COR6NOPUS WART CRESS. (C. didymus.) 



3 SIS^MBRIUM. 



i a Pods %-i in. long, appressed to stem 



HEDGE MUSTARD. (S. officinale.) 

 b Pods 2-4 in. long, spreading from stem 



TUMBLE MUSTARD. (S. altissimum.) 



157 



