GENUS 34. 



MUSTARD FAMILY. 



'85 



4. Cardamine arenicola Britton. Sand 

 Bitter-cress. Fig. 2086. 



Cardamine virginica 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, \"-\\" 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"-i" 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 hirsuta 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, 2'-i5" 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, i"-2" wide; mature 

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

 erect on ascending pedicels, 2"-s" 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 Shuttlw. 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, 

 S'-iS' 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, $"-4" wide ; pedicels ascending, 

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

 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. 



Y 



