CRUCIFER^. 19 



recurved, shorter than the awl-shaped style. N. W., in 

 beds of pools and streams. 



6. N. amphib'ium, E. Br. Flowers white. Stem tall, 

 erect, branching above, sparingly pubescent. Leaves lyrate- 

 pirinatifid, rough-pubescent, the lobes coarsely toothed. 

 Pods several times longer than the style, but much shorter 

 than the pedicels. Wet places. 



2. BARBARE'A, R. Br. WINTER CRESS. 



B. VUlga'ris, E. Br. (YELLOW EOCKET.) Stem smooth, 

 1-3 feet high. Lower leaves lyrate, the terminal division 

 round and generally large, and 1-5 pairs of lateral ones (the 

 latter sometimes absent) ; upper leaves obovate, more or less 

 pinnatifid at the base. Pods linear, erect, or slightly 

 spreading. In var. Strieta, a common form in the North- 

 West, the pods are appressed. Low grounds. 



3. VESICA'RIA, Lam. BLADDER-POD. 



V. LudOVieia'na, DC. (WESTERN BLADDER-POD.) (Lesque- 

 rella Ludoviciana, Watson, var. arenosa, Watson.) Stem 

 low, simple, or somewhat branched above. Flowers large. 

 Eadical leaves spathulate, entire ; stem-leaves linear. Pods 

 hairy, globose, rather longer than the style. N. W. 



4. DENT A' RI A, L. TOOTHWORT. PEPPER-ROOT. 



1. D. diphyl'la, L. (TWO-LEAVED T.) Flowers white. 

 Stem-leaves 2, nearly opposite, ternately divided. Eoot-stock 

 toothed, pleasantly pungent to the taste. Eich woods. 



2. D. laeinia'ta, Muhl. (LACINIATE T.) Flowers purplish. 

 Stem-leaves 3, in a whorl. Eoot-stock jointed, scarcely 

 toothed. Eich woods. 



5. CARDAM'INE, L. BITTER CRESS. 



1. C. rhomboi'dea, DC. (SPRING CRESS.) Flowers white 

 or (in var. purpurea) rose-purple. Stem tuberous at the 

 base. Lower leaves round-cordate ; upper nearly lance- 

 olate ; all somewhat angled or toothed. Wet meadows. 



2. C. pratensis, L. (CUCKOO-FLOWER. LADIES' SMOCK.) 

 Flowers white or rose-colour, showy. Stem from a short 



