Dicotyledones. 51 



VI. DENTARIA. Toothwort or Pepperroot. 



(L., dens, a tooth.) 



Flowers white, rose-colored, or purple, in corymbose clusters, petals 

 much exceeding the calyx. Pods linear and flattened, parallel with the 

 partition, dehiscing from the base. Seeds in i row in each cell. Peren- 

 nial herbs from fleshy, horizontal rootstocks. Stems leafless below, 

 2-4-leaved above. Leaves 3-divided, or palmately laciniate, petioled. 



1. Dentaria laciniata, Muhl. (L., lacinia, a flap.) CuT-LEAVED ToOTH- 

 WORT or PEPPERROOT. Basal leaves, when present, similar to the stem leaves, 

 which are 3-parted, the divisions lanceolate or oblong, lobed or cleft. Leaves 

 petioled, 2 to 5 inches broad ; stem leaves close together, usually 3. Flowers rather 

 more than 5 inch broad, white or pinkish. In moist woods. 



u. Dentaria diphylla, Miohx. (Gr., di, two; phyllon, leaf.) Two-leaved 

 TOOTHWORT. Basal leaves long-petioled, 4 to 5 inches broad, ternate, the divisions 

 broadly ovate, dentate, or lobed ; the two stem leaves similar to the basal leaves, and 

 opposite or nearly so. Flowers white. In woods and meadows. 



VII. SELENIA. 



(Gr., selene, the moon; from fancied resemblance of the pods.) 



Flowers yellow. Pods flattened parallel to the broad partition, oblong, 

 and narrowed at both ends. Valves thin, finely veined, and nerveless. 

 Styles long and slender. Seeds in two rows in each cell. Low annuals 

 with pinnatifid leaves, and leafy-bracted racemes. 



I. Selenia aiirea, Nutt. (L.,aa«aj, golden yellow.) Stems 2 to 8 inches high. 

 Basal leaves i to 2 inches long, once or twice pinnatifid; stem leaves smaller but 

 similar. Pedicels about \ inch long in fruit. Pod often more than 4 inch long and 

 J to J inch broad. In open places. 



Vra. LEAVEWWORTHIA. 



(Named from M. C. Leavenworth.) 



Upper part of corolla white or purple, yellow toward the base. Pods 

 broadly oblong-linear, flattened parallel to the partition, J to i inch and 

 more long. Valves nerveless, finely reticulate-veined. Seeds in i row 

 in each cell. Low annuals with scapelike stems, and Jyrate-pinnatifid 

 basal leaves. Flowers terminal, soHtary, or few. 



I. Leavenworthia Michauxii, Torr. (L., genitive of proper name.) Stems 

 ttifted, 3 to 6 inches high; basal leaves i to 4 inches long; stem leaves few or want- 

 ing. Petals wedge-shaped, about twice the length of the calyx. Pods oblong or 

 linear. Leavenwortliia torulisa. Gray, is similar to the above, but with pods con- 

 stricted between the seeds. In open dry places. 



