24 CKUCIFEK.E. (AIUSTAKD FAMILY.) 



1. NASTURTIUM, R. Br. WATER-CRESS. 



Silique nearly terete, linear or oblong, or short and silicle-like, usually 

 curved upward ; the valves nerveless. Seeds numerous, small, in two rows in 

 each cell, not margined. Cotyledons accumbent. Herbs. Leaves pinnatelv 

 lobed. Flowers white or yellow, small. 



# Petals yel/oii', minute (except No. 6). 



1. N. tanacetifolium, Hook. & Arn. Stems diffuse, 6'- 12' long; 

 leaves bipinuatifid, the lobes toothed ; silique oblong-linear, twice as long as 

 the pedicel. Ditches and wet ground in the lower districts. Mav-June. 



2. N. sessiliflorum, Xutt. Stem erect, branching, 1- 2 high; leaves 

 oblong-obovate, pinnatifid towards the base, toothed above; silique linear- 

 oblong; nearly sessile ; style short and thick. Wet ground. South Carolina, 

 Tennessee, and westward. May - June. 



3. N. palustre, DC. Smooth or hairy ; stem erect, 1 -3 high, branch- 

 ing ; leaves pinuatifid, the lobes oblong, toothed; siliqne short, ovate or 

 oblong-ovate, barely hall as long as the spreading pedicel ; style slender. - 

 Wet ground, chiefly in the upper districts. 



4. N. obtusum, Nutt. Low and spreading; leaves pinnatifid, the ob- 

 long or rounded lobes sparingly toothed ; silique oblong, obtuse, twice as long 

 as the slender pedicel. Banks of the Mississippi. 



5. K". limosum, Nutt. "Very smooth; leaves lanceolate, laciniately 

 piimatitid towards the base, nearly entire above, or angularly toothed, the 

 lobes serrate or entire ; pedicels much shorter than the short silique ; stigma 

 nearly sessile." New Orleans (Nuttn/l). 



6. N. sylvestre, H. Br. Stem ascending ; leaves pinuately divided into 

 narrow toothed lubes : siliquc linear, mostly shorter than the slender pedicel; 

 style verv short; petals yellow, longer than the calyx. New Orleans. 

 Introduced. 



* * Pttula white, conspicuous. 



7. N. officinale, K. Br. (WATER-CRESS.) Stems spreading and root- 

 ing; leaves pinnate, the oblong or roundish lobes nearly entire ; silique lin- 

 ear, curved, longer than the spreading pedicel. Cool springs and branches. 

 Introduced. 



8. N. lacustre, Uray. Aquatic; stem 2 -3 long; immersed leaves 

 pinnatelv divided into indefinite capillary segments, deciduous : the emerged 

 ones oblong; silique obovate, shorter than the pedicel; style shorter than the 

 ovary. In a cool spring, Marianna, Florida, and New Orleans. Kare. 



2. CARDAMINE, L. 



Silique linear flattened, the valves veinless, usually opening elastically 

 from the base. Seeds wingless, disposed in a single row in each cell and sus- 

 pended by a filiform stalk. Cotyledons accumbent. Tender, mostly smooth 

 herbs, with usually pinnatelv divided leaves, and white flowers. 



