CRUCIFERAE. 455 



mountain swamps, Me. to Mich, and N. Car. Also in Europe and Asia. May- 

 Aug. 



7. Cardamine Clematitis Shuttlw. Mountain Bitter-cress. (I. F. f. 

 1730.) Glabrous, dark green; stem weak, slender, 1-4 dm. long. Leaves various, 

 some of them of a single orbicular or reniform, deeply cordate terminal segment, 

 some of them with two additional ovate oblong or rounded lateral segments, the 

 uppermost occasionally linear-oblong and entire; flowers in short racemes, white, 

 5-8 mm. wide; pedicels ascending, 6-12 mm. long; pods ascending or divergent, 

 2-4 cm. long, less than 2 mm. wide; style 2-4 mm. long, subulate. In wet woods, 

 high mountains of Va. and N. Car. to Ala. May-July. 



8. Cardamine bellidifolia L. Alpine Cress. (I. F. f. 173 1.) Tufted, 

 glabrous, 5-13 cm. high; roots fibrous. Lower leaves long-petioled, ovate, obtuse, 

 the blade 8-12 mm. long, abruptly contracted into the petiole, entire, or with a 

 few rounded teeth; upper leaves similar, shorter-petioled; flowers 1-5, white; 

 petals about twice the length of the calyx; pods erect, linear, 2.5 cm. long, 2 mm. 

 wide, narrowed at each end; pedicels 2-6 mm. long; style stout, less than 2 mm. 

 long. Alpine summits of the White Mountains, N. H. ; Mt. Katahdin, Me. ; Green- 

 land and arctic Am. ; the Canadian Rocky Mts. ; Cal. Also in Europe. July. 



9. Cardamine purpurea (Torr.) Britton. Purple Cress. (I. F. f. 1732.) 

 Glabrous, 1.5-4 dm. high from tuberiferous rootstocks. Basal leaves slender- 

 petioled, 2-3 cm. broad, ovate or orbicular, cordate, thickish, the upper sessile, 

 dentate or entire; pedicels 8-25 mm. long; flowers purple, 1-2 cm. broad; pods 

 nearly erect, 2.5 cm. long. 2 mm. broad, pointed at each end; style 4 mm. long. 

 In cold, springy places, Quebec and arctic Am. to the Canadian Rocky Mts., 

 Md. and Wis. April-May. 



10. Cardamine bulbosa (Schreb.) B.S.P. Bulbous Cress. (I. F. f 1733.) 

 Glabrous, erect from a tuberiferous base, 2-4.5 dm. high. Basal leaves oval, or 

 nearly orbicular, 2-4 cm. long, sometimes cordate, angled or entire, long-petioled; 

 stem-leaves sessile or the lower petioled, oblong or lanceolate, dentate or entire; 

 pedicels 8-25 mm. long; flowers white, 1-1.5 cm. broad; petals three or four times 

 the length of the calyx; pods 2.5 cm. long, erect, linear-lanceolate, narrowed at 

 each end; style 2-4 mm. long; stigma prominent; seeds short-oval. In wet 

 meadows and thickets. N. S. to Ont. and Minn., Fla. and Tex. April-June. 



11. Cardamine rotundifolia Michx. Round-leaved or American Water- 

 cress. (I. F. f. 1734.) Weak, ascending or decumbent, forming long stolons; 

 roots fibrous. Basal leaves and stem-leaves similar, the lower petioled, the upper 

 sessile, ovate, oval, or orbicular, obtuse, undulate angled or entire, thin; pedicels 

 1-2.5 cm - l° n § i n f rult ; flowers white, 4-6 mm. broad; pods linear, 14-16 mm. 

 long, 1 mm. wide, pointed; style 2 mm. long; stigma minute; seeds oblong. In 

 c hi springs, N. J. to Ohio, N. Car. and Ky. May-June. 



20. DENTARIA L. (See Appendix.) 



Perennial herbs, with horizontal scaly or toothed rootstocks, erect, mostly un- 

 branched stems leafless below, 3-divided or palmately laciniate petioled leaves, and 

 corymbose or short racemose white rose-colored or purple flowers. Petals much 

 longer than the sepals. Stamens 6. Style slender. Silique linear, flat, elastic 

 ally dehiscent from the base, its valves nerveless or with a faint midnerve; stipe 

 none. Seeds in 1 row in each cell, thick, oval, flattened, wingless; cotyledons 

 thick, accumbent. [Greek, tooth, from the toothlike divisions of the rootstock.] 

 About 15 species, natives of the northern hemisphere. Besides the following, 

 some 7 others occur in western N. Am. 



I leaves and stem-leaves similar. 



Leaf-divisions lanceolate or oblong, lobed or cleft. 1. D. laciniata. 



Leaf-divisions ovate or ovate-oblong, crenate or lobed. 



Stem-leaves 2, opposite, or close together ; rootstock continuous. 



2. D. diphylla. 

 Stem-leaves 2-5, alternate ; rootstock jointed. 3. D. maxima. 



Divisions of the stem-leaves linear or lanceolate ; those of the basal leaves ovate, much 

 broader. 4. D. heterophylla. 



i. Dentaria laciniata Muhl. Cut-leaved Toothwort or Pepper-root. 

 (I. F. f. 1735.) Pubescent or glabrous, scapose, 2-4 dm. high; rootstock deep, 



