7. Cardamine Bellidifòlia L. Alpine Cress

Fig. 2089

Cardamine bellidifolia L. Sp. Pl. 654. 1753.

Perennial, tufted, glabrous, 2-5' high, with fibrous roots. Lower leaves long-petioled, ovate, obtuse, the blades 4"-8" long, 3 "-4" broad, 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, 3/4'-l 1/4' long, 1" wide, narrowed at each end; pedicels 1"-3" long; style stout, less than 1" long.

Alpine summits of the White Mountains, N. H.; Mt. Katahdin, Me.; Greenland and arctic America; the Canadian Rocky Mountains; California. Also in Europe and Asia. July.

8. Cardamine Douglássii (Torr.) Britton. Purple Cress

Fig. 2090

Arabis rhomboidea var. purpurea Torr. Am. Journ.

Sci. 4: 66. 1822. Arabis Douglassii Torr.; T. & G Fl. N. A. 1: 83.

As synonym. 1838. Cardamine Douglassii Britton, Trans. N. Y. Acad.

Sci. 9: 8. 1889. C. purpurea Britton, in Britt. & Brown, 1ll. Fl. 2:

139. 1897.

Glabrous or somewhat pubescent, generally slender, 6'-15' high, perennial by tuberiferous rootstocks. Basal leaves slender-petioled, about 1' broad, ovate or orbicular, cordate, thickish; lower stem-leaves similar, but short-petioled, the upper sessile, mostly close together, dentate or entire; pedicels 4"-12" long; flowers purple, showy, 5"-10" broad; pods nearly erect, 1' long, 1" broad, pointed at each end; pedicels 4"-12" long; style 2" long.

In cold springy places, Quebec and arctic America to the Canadian Rocky Mountains, south to Maryland, Kentucky and Wisconsin. Blooming two or three weeks earlier than the next, and more abundant northward. Mountain water-cress. April-May.

9. Cardamine Bulbòsa (Schreb.) B.S.P. Bulbous Cress

Fig. 2091

Arabis bulbosa Schreb.; Muhl. Trans. Am. Phil. Soc.

3: 174. 1793. Cardamine rhomboidea DC. Syst. Veg. 2: 246. 1821. Cardamine bulbosa B.S.P. Prel. Cat. N. Y. 4. 1888.

Perennial, glabrous, erect from a tuberous base, with tuber-bearing rotstocks, simple or sparingly branched above, 6'-2° high. Basal leaves oval, or nearly orbicular, 1'-1 1/2' long, sometimes cordate, angled or entire, long-petioled; stem-leaves sessile or the lower petioled, mostly distant, oblong or lanceolate, dentate or entire,- 1'-2' long; pedicels 4"-12" long; flowers white, 5"-7" broad; petals three or four times the length of the calyx; pods 1' long, erect, linear-lanceolate, narrowed at each end; style 1"-2" long; stigma prominent; seeds short-oval.

In wet meadows and thickets, Nova Scotia(?); Vermont to southern Ontario and Minnesota, south to Florida and Texas. Ascends to 2000 ft. in Virginia. Spring-cress. April-June.

10. Cardamine Rotundifolia Michx. Round-Leaved Or American Water-Cress

Fig. 2092

Cardamine rotundifolia Michx. Fl. Bor. Am. 2: 30. 1803.

Perennial, 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, the base rounded, truncate or cordate; pedicels 4"-12" long; flowers white, 2"-3" broad; pods linear, 7"-8" long, 1/2" wide, pointed; style 1" long; stigma minute; seeds oblong.

In cold springs, New York to Ohio, Missouri, North Carolina and Kentucky. Ascends to 3500 ft. in Virginia. Mountain water-cress. May-June.