156 CRUCIFElliE. Cardaviine. 



^— •»— Meadows and mountain sides ; eastern species. 



C. rotundifolia, Michx. Kootstock very short, fibrous-rooted and very rarely at all 

 tuberiferous : stem lax, decumbent, becoming one or two feet long ; the branches at length 

 rooting at the end and the raceme proliferous : leaves all rounded or ovate and petiolate, 

 usually subcordate, sinuate; the larger 1 or 2 inches long, exceeding the petioles: flowers 

 white: pods few-seeded, attenuate to a long slender style, 6 to 9 lines long, on spreading 

 pedicels about as long. — Fl. ii. 30; Hook. liot. Misc. iii. 241, t. 109. C. rotundifolia, var. 

 7, Torr. & Gray, Fl. i. 83. — In cool shaded springs, Middletown, N. J., Willis, Pennsyl- 

 vania, Kentucky, Short, and southward in tiie mountains to N. Carolina. 



C. rhomboidea, DC. Stem from a small tuberous base and slender rootstock bearing 

 small tubers, erect, usually simple, i to 2 feet high, glabrous or sometimes puberulent 

 especially at base : leaves at base long-pctiolate, rounded to ovate and'^somewhat cordate, 

 sinuate or entire; the cauline becoming oblong-lanceolate and sessile and often acutely 

 toothed: flowers white: pods 9 to 18 lines long including the slender style (1 to 3 lines 

 long), about equalling the ascending pedicels: seeds small, orbicular ; radicle cleft to or 

 below the middle. — Syst. ii. 246; Hook. 1. c. 239, t. 108; Gray, Gen. 111. i. 136, t. 55. 

 C. rotundifolia, Torr. & Gray, 1. c excl. vars.i Arabis bulbosa, Schreb. iu Muhl. Trans. Am. 

 rhU. Soc. iii. 174. A. rliomboidea & A. tuberosa, Pers. Syn. ii. 204. — Common in Ontario 

 and Minnesota, southward to Florida and Texas. 



Var. purpurea, Tork.- Low (a foot high or less), somewhat loosely pubescent or 

 rarelv glabrous: flowers purplish or rose-color. — Fl. N. Y. i. 56. C. rotundifolia, var. /3, 

 Torr. & Gray, Fl. i. 83. Arcibis rhomboidea, var. purpurea, Torr. Am. Jour. 8ci. iv. 66. — 

 Ontario to W. Maryland, J. D. Stnith, and westward to Wisconsin and Kentucky ; reported 

 as^also collected by Drummond farther to the north. This species closely approaches 

 Dentaria. Thlaspi tubei'osum, Nutt. Gen. ii. 65, is probably the same, from its tuberous root, 

 rose-colored flowers, and pubescence, though the pod is described as orbicular. 

 •(— -i— -h- Western mountain species, sometimes subalpine. 



C. cordif olia, Gray. Glabrous or more or less pubescent with spreading hairs : stems erect 

 from a slender rootstock, 1 or 2 feet high, simple: leaves (a dozen or more) petiolate; the 

 lowest cordate ; the rest ovate to oblong-ovate, acute or acutish, cordate or truncate at base, 

 more or less repaud or coarsely crenate, 1 to 2i inches long: raceme sessile: flowers white: 

 pods 10 to 15 lines long witli the short style, on ascending pedicels; radicle cleft to the 

 middle. — PI. Fendl. 8. C. rhomboidea, Durand, Fl. Utah, 159. — Rocky Mountains, Col- 

 or.ido to New Mexico ; Wasatch Mountains, Utah. 



C. Lyallii, Watson. Glabrous : stem erect from a running rootstock, simple or branched, 



1 or 2 feet high : leaves few (4 to 8), petiolate, reniform to cordate, sinuate, 1 to 3 inches 

 broad : raceme pedunculate : flowers white : pods an inch long or less, ratlier shortly attenu- 

 ate to a very short style, on spreading pedicels; radicle cleft to the middle. — Proc. Am. 

 Acad. xxii. 406. C. cordifolia, Wats. Bot. King Exp. 19, in part; Gray, Proc. Am. Acad, 

 viii. 376; Torr. Bot. Wilkes Expcd. 229. — Cascade Moimtains, iriVi-es, Ly all. Halt (no. 

 29), G. R. Vasey, J. Hoioell ; Blue Mountains, Oregon, Cusick; Clover Mountain.s, N. 

 Nevada, Watson ; and Placer Co., Calif/, near Truckee, Sonne. Resembling the European 

 C. asarifolia, the stem of which is branched above and the pod more attenuate. 



* * Radical leaves mostly entire ; the cauline 3-5-foliolate. 

 +- Eastern species. 

 C* (?) curvisiliqua, Shuttl.^ Aquatic, glabrous, decumbent, rooting in mud at base: 

 stems elongating, furrowed : earliest leaves entire, suborbicular, long-petioled ; the later 

 ones pinnate ; leaflets obovate or oval, rounded at the apex, very shallowly lobed or quite 

 entire, acute at the base : flowers small : petals narrow, a line and a half in length : fruiting 

 raceme elongated, very loose, the rhachis often flexuous, the pedicels divaricate: pods 



^ Add syn. C. bulbosa, Britton, Sterns & Poggenburg, Prelim. Cat. N. Y. 4. 



2 This variety has been raised to specific rank by Dr. Britton as C. Dmglnssii, Trans. N. Y. Acad. 

 Sci. ix. 8, being the Arnbis Douglnssii, Torr. (used as synonym) in Torr. & Gray, Fl. i. 83. 



8 This species, although referred by Dr. Watson to Cardamine, was not described iu his 

 manu.script. 



