52 CRUCIFERiE, Nasturtium. 



3. Nasturtium natans, DC Floating Cress. 



Emersed leaves oblong-linear, entire ; immersed ones cut into many capillary segments ; 

 petals scarcely longer than the calyx ; siliques obovate-globose. — DC. syst. 2. p. 198; Deless. 

 ic. 2. t. 15. 



var. Americanum, Gray. 



Emersed leaves serrate ; petals (white) twice as long as the calyx ; siliques obovate ; style 

 as long as the ovary and half as long as the fruit. — Gray in ann. lye. New-York, 3. p. 223 ; 

 Torr. 4- Gr.fl. N. Am. 1. p. 75. N. natans, Hook.fl. Bor.-Am. 1. p. 39 ; Beck, hot. p. 32. 



In Oneida lake {Dr. Gray, Dr. Ktiicskcrn) ; also near Ogdensburgh, St. Lawrence county 

 Dr. Crawe). Flowers in July. One of the rarest plants in the United Stales, but not remark- 

 able for anything but its peculiar habit, being the only aquatic species of the genus. 



2. BARBAREA. R. Brown in hort. Keiu. (ed. 2.) 4. p. 109 ; Endl. gen. 4851. 



vhnter cress. 



[So called because the plant was formerly dedicated to St. Barbara.] 



Silique 4-angled or somewhat 2-edged. Seeds in a single series. Calyx equal at the base. — 

 Leaves lyrately pinnatifid. Flowers yellow. 



1. Barbarea vulgaris, R. Brown. Scurvy Grass. 



Lower leaves lyrate, the terminal lobe roundish ; upper ones obovate, toothed or pinnatifid 

 at the base ; silique 4-angled, with the sides somewhat convex, acuminate with the style. — 

 DC.pirodr. \.p. 140; Hook.fl. Bor.-Am. \.p. 39; Darlingt.fl. Cest.p. 381 ; Torr. <^Gr. 

 fl. N. Am. 1. p. 75. Erysimum Barbarea, Linn.; Willd. sp. 3. p. 509. 



Root perennial, fibrous. Stem 1-2 feet high, glabrous, branched above. Leaves 2-4 

 inches long ; the terminal lobe of the lower ones very large ; segments oblong. Flowers in 

 dense racemes, bright yellow. Siliques about an inch long ; the pointed style about a line 

 and a half long. 



Common in low wet grounds, particularly along rivulets ; flowerhig from May to October. 

 Probably introduced. The early leaves are sometimes eaten as a salad. It is the Com7)ion 

 Winter Cress, and is also known by the name of Yellow Rocket. 



