Genus 34. 



MUSTARD FAMILY. 



185 



4. Cardamine arenicola Britton. 

 Bitter-cress. Fig. 2086. 



Sand 



Cardamine virgiuica Michx. Fl. Bor. Am. 2 : 29. 

 1803. Not L. 1753. 



Cardamine arenicola Britton, Bull. Torr. Club 19 : 

 220. 1892. 



Annual, glabrous, usually much branched from 

 the base, leafy nearly or quite up to the racemes, 

 erect, 6'-i2' high. Segments of the leaves 

 numerous, linear or linear-oblong, V'-ii" wide, 

 obtusish, entire, or with 1-3 small teeth, those of 

 the basal ones slightly wider than those of the 

 upper; flowers about 2" broad, white; mature 

 pods strictly erect, less than i' long, i["-J" wide, 

 their pedicels ascending; styles almost wanting. 



In moist or wet sandy soil, Connecticut to Florida, 

 Kentucky and Tennessee. March-April. 



5. Cardamine parviflora L. Small-flowered 

 Bitter-cress. Fig. 2087. 



Cardamine parviflora L. Sp. PI. Ed. 2, 914. 1763- 

 Cardamine hirstita var. sylvatica A. Gray, Man. Ed. 

 5, 67. 1867. 



Annual or biennial, glabrous or very sparingly 

 pubescent, stem weak, erect or ascending, very 

 slender or almost filiform, s'-is' long, usually 

 leafy up to the racemes, but the leaves scattered. 

 Segments of the leaves numerous, oblong or 

 linear, or the terminal ones sometimes orbicular, 

 entire or sparingly toothed, ¥'-2" wide ; mature 

 pods i' long or less, rather less than i" wide, 

 erect on ascending pedicels, 2"-$" long, the axis 

 of the racemes commonly zigzag; flowers scarcely 

 more than i" broad, white; style almost wanting. 



On dry rocks, Quebec to western Ontario and 

 Oregon, south to Massachusetts and Georgia. Also 

 in northern Europe and Asia. April-May. 



6. Cardamine Clematitis Shuttlvv. Moun- 

 tain Bitter-cress. Fig. 2088. 



Cardamine Clematitis Shuttlw. ; S. Wats. Bibl. Index 

 i: 53. 1878. 



Perennial, glabrous, dark green, somewhat suc- 

 culent, stem weak, ascending or erect, slender, 

 5-15' long. Leaves remarkably various, some of 

 them of a single orbicular or reniform, deeply 

 cordate, entire or undulate terminal segment, some 

 of them with two additional ovate oblong or 

 rounded lateral segments, the uppermost occa- 

 sionally linear-oblong and entire; petioles of the 

 stem-leaves sagittate at base; flowers in short 

 racemes, white, 3"-4" wide; pedicels ascending, 

 3"-6" long; pods ascending or divergent, i'-i4' 

 long, less than i" wide; style i"-2" long, subu- 

 late. 



In wet woods, high mountains of southwestern 

 Virginia and North Carolina to Alabama. May-July. 



