VOL. II.] 



MUSTARD FAMILY. 



10. Cardamine bulbosa (Schreb.) B.S.P. Bulbous Cress. (Fig. 1733.) 



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 



Glabrous, erect from a tuberiferous base, sim- 

 ple or sparingly branched above, 6 / -i^ high. 

 Basal leaves oval, or nearly orbicular, \'-\]^ f 

 long, sometimes cordate, angled or entire, long- 

 petioled; stem-leaves sessile or the lower peti- 

 oled, oblong or lanceolate, dentate or entire, i / - 

 2 X long; pedicels 4 // -i2 // long; flowers white, 

 5//_7// broad; petals three or four times the 

 length of the calyx; pods \' long, erect, linear- 

 lanceolate, narrowed at each end; style i/'-a" 

 long; stigma prominent; seeds short-oval. 



In wet meadows and thickets, Nova Scotia to 

 southern Ontario and Minnesota, south to Florida 

 and Texas. Ascends to 2000 ft. in Virginia. April- 

 June. 



ii. Cardamine rotundifdlia 

 Michx. Round-leaved or Amer- 

 ican Water-cress. (Fig. 1734.) 



Cardamine rotundifolia Michx. Fl. Bor. 

 Am. 2: 30. 1803. 



Weak, ascending or decumbent, form- 

 ing 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 6 // -i2 // long in 

 fruit; flowers white, 2 // -3 // broad; pods 

 linear, y'MJ" long, *" wide, pointed; 

 pedicels 4 // -8 // long; style i" long; 

 stigma minute; seeds oblong. 



In cold springs, New Jersey to Ohio, 

 south to North Carolina and Kentucky. 

 Ascends to 3500 ft. in Virginia. May-June. 



19. DENTARIA L. Sp. PI. 653. 1753. 



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

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

 bose or short-racemose white rose-colored or purple flowers. Petals much longer than the 

 sepals. Stamens 6. Style slender. Silique linear, flat, elastically dehiscent from the base, 

 its valves nerveless or with a faint midnerve; stipe none. Seeds in i row in each cell, thick, 

 oval, flattened, wingless; cotyledons thick, nearly or quite equal, accumbent. [Greek, tooth, 

 from the tooth-like divisions of the rootstock.] 



About 15 species, natives of the northern hemisphere. Besides the following, some 7 others 

 occur in the western parts of North America. The species are called Pepper-root and Tooth-root, 

 from their pungent and toothed rootstocks. 



Basal leaves and stem-leaves similar. 



Leaf-divisions lanceolate or oblong, lobed or cleft. i. 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. 



