126 CRUCIFER^. Lepidlum. 



about twice the length of the sepals, indistinctly and broadly clawed, deciduous with the 

 sepals: stamens 2: capsules ovate-oblong, 1-J- lines long, barely retuse, inconspicuously 

 reticulated when quite ripe. — Nutt. in Torr. & Gray, Fl. i. 116; Hook. Lond. Jour. Bot. vi. 

 71. L. Utuhense, Jones, Bull. Torr. Club, viii. 70, & Zoe, iv. 266, is exactly the same. — 

 Rocky Mountains of Wyoming, Lettermun, westward to Utah, Ward, Jones ; S. E. Wash- 

 ington, Nuttall, and the Muddy River on the Upper Missouri, Gei/er, ace. to Hooker. A 

 very characteristic species, distinguished by its thick root, relatively broad-clawed petals, 

 and reduced stamens. 



^_ ^_ Capsule ovate or ovate-oblong, distinctly winged at the retuse or bifid apex, seldom 

 exceeding 2 lines in breadth : annuals, introduced from the Old World. 



L. SATIVUM, L. (Garden Cress.) Erect, glabrous : branches ascending : leaves cleft nearly 

 to the rhachis ; segments few, oblauceolate or linear, entire or obtusely toothed or lobed 

 toward the apex : racemes elongated ; pedicels erect or nearly so, shorter than the capsules ; 

 style included in tlie narrow sinus between the thin erect obtuse lobes of the pod. — Spec, 

 ii. 644; Porter in Hayden, Kep. 1870,473, & Fl. Col. 10; Coulter in Hayden, Rep. 1872, 

 761. — Sparingly introduced about dwellings in Brit. America from Gaspe to Vancouver, 

 Macoun ; and in the Northern States across the continent, but infrequent. (Introd. from Eu.) 



L. CAMPESTRE, R. Br. (Cow Cress.) Erect, pubescent : stem simple and very leafy up to 

 the inflorescence : leaves oblong, obtuse, denticulate, erect ; the lower ones narrowed to 

 slender petioles ; the upper sessile by a sagittate-clasping base : pedicels horizontally spread- 

 ing, a little shorter than the thickish papillose capsule : petals white : anthers yellow : style 

 slightly exserted from the narrow notch. — R. Br. in Ait. f. Kew. ed. 2, iv. 88; Beck, Bot. 

 27; Torr. & Gray, Fl. i. 115; Lockwood, Bot. Gaz. v. 14; Wats. & Coulter in Gray, Man. 

 ed. 6, 73. — Becoming locally common in cultivated ground, Cape Breton and S. Canada, 

 Macoun, to Virginia, not infrequent in the interior; also near Waldo, Oregon, Rattan; fl. 

 May, June. (Nat. from Eu.) The subspecies L. SMfTnii, Hook., with smoother pod and 

 purple anthers, has been collected at Milton, Mass., Br. Kennedy, but the differences do 

 not appear significant. Yellow-anthered individuals with smoothish pods are not infrequent. 

 Nor does the length of the style furnish a satisfactory distinction. 



H_ ^— H^ Capsule suborbicular or somewhat obcordate, flat and broad, 2| to 4 lines in 

 diameter. 

 L. Preniontii "Watson. Suffrutescent, glabrous and glaucous, much branched, 10 to 20 

 inches high : leaves narrow, linear, acute, 1^ to 3 inches long, entire or with 1 to 2 pairs of 

 narrow linear spreading acute teeth : racemes very numerous : flowers on slender spreading 

 often flexuous pedicels : petals H lii^es long : pods thin, light colored, usually but not ahvays 

 more or less pointed at the base, shallowly obcordate with broad rounded lobes. — Bot. 

 King Exp. 30, t. 4, f. 3, 4 ; Coville, Contrib. U. S. Nat. Herb. iv. 65. — Arid places, Col- 

 orado, Eothrock & Wolf , to Nevada, Arizona, and S. California; especially abundant in 

 the Mohave Desert ; fl. May, June. A species well marked by its large pods. 



§ 2. Stigma sessile or subsessile ; capsule emarginate or retuse at the apex. 



* Capsule merely emarginate. 

 ■h- Cotyledons accumbent (parallel with the surfaces of the capsule and seed), relatively 

 broad. 

 L. Virginicum, L. (Peppergrass.) Pubemlent, erect, 8 inches to 2 feet high lower 

 leaves ]jinnate or deeply pinnatifid, seldom persisting until fruit ; segments incisely serrate ; 

 the terminal one much the largest ; upper leaves linear or lanceolate, erect, incisely toothed 

 or entire; teeth unecpial and upwardly pointed : racemes 1-several, many-flowered; pedicels 

 slender, widely spreading, 1|- to 2 lines long: petals spatnlate, white, exceeding the oblong 

 obtusish sepals : stamens 2 (to 4) : capsule orbicular, smooth, often purple-tinged at maturity, 

 narrowly margined above, 1^ lines in diameter; seeds light brown, narrowdy wing-margined, 

 very flat ; the faces traversed by a curved and eccentric groove marking the division 

 between the radicle and flat cotyledons. — Spec. ii. 645 ; Michx. Fl. ii. 27 ; Pursh, Fl. ii. 

 435 ; Gray, Gen. 111. i. 168, t. 73 ; Ell. Sk. ii. 140 ; Torr. Fl. N. Y. i. 65 ; Darl. Fl. Cest. 381 ; 

 Torr. & Gray, Fl. i. 115; Leggett, Bull. Torr. Cliib, i. 5. L. Iberis, Schk. Handb. ii. 222, 

 t. ISO. L. triandrum, Stokes, Bot. Mat. Med. iii. 426. L. majus, Darracq, Bull. Soc. Bot. Fr. 



