44-6 FLORA. 



smaller, entire or with a few lobes ; flowers I mm. broad or less, greenish ; petals 

 none ; stamens 2 ; pods flat, not margined, about 2 mm. in length, short-oval or 

 suborbicular; pedicels slender, 3-4 mm. long in fruit; valves sharply keeled, barely 

 winged ; cotyledons incumbent. In waste places, on ballast and along roadsides, 

 N. S. to Tex. Nat. from Europe. Summer. 



4. Lepidium Virginicum L. Wild Pepper-grass. (I. F. f. 1687.) Similar 

 to L. ruderalc. Basal leaves obovate or spatulate in outline, less pinnatifid, gen- 

 erally with a large terminal lobe and numerous small lateral ones, all dentate, gla- 

 brous or slightly pubescent; stem-leaves lanceolate or oblongdinear, sessile, or the 

 lower stalked; flowers 1-2 mm. broad, white ; petals generally present, sometimes 

 wanting in the later flowers; pedicels slender, spreading, 4-6 mm. long in fruit; 

 pod flat, short-oval or orbicular, minutely winged above ; cotyledons accumbent. 

 In fields and along roadsides, Quebec to Minn., Colo., Fla., Tex. and Mex. Also in 

 the West Indies. May-Nov. 



5. Lepidium apetalum Willd. Apetalous Pepper-grass. (I. F. f. 1688.) 

 Much like L. ruderale and L. Virginicum. Basal leaves pinnatifid. Pods nearly 

 orbicular, slightly wing-margined above, about 2 mm. in diameter; flowering pedi- 

 cels ascending, forming narrow racemes, or in fruit spreading ; petals minute or 

 wanting; cotyledons incumbent. In dry soil, Me. and Ont. to Cab, D. C. and Tex. 

 Apparently nat. from Asia. May-Aug. 



Lepidium medium Greene, with rather large white petals, orbicular pods, 3 mm. 

 broad, and incumbent cotyledons, is found by Mr. Bicknell near New York city, 

 and on Mt. Desert Island, Me. It is native of Western N. Am. 



6. Lepidium sativum L. Garden, Town, or Golden Pepper-grass. (I. 

 F. f. 1689.) Glabrous, bright green ; stem about 3 dm. high. Lower leaves 2- 

 pinnate, or pinnate with the segments lobed or pinnatifid, 0.7-2 dm. long; upper 

 leaves sessile or nearly so, much smaller; flowers in loose elongated racemes, about 

 2 mm. broad; petals present, often pinkish ; silicles oval, about 2 mm. wide, equal- 

 ling or longer than their pedicels, emarginate, winged all around; style very short. 

 In waste places, Quebec to N. Y. and Br. Col. Escaped from gardens. Native of 

 Europe. May-Aug. 



5. CORONOPUS Gaertn. [SENEBIERA DC] 

 Annual or biennial, diffuse herbs, with mostly pinnatifid leaves, and small whit- 

 ish flowers. Silicles small, didymous, laterally compressed, sessile. Stamens often 

 only 2 or 4. Valves of the capsule oblong or subglobose, obtuse at each end, in- 

 dehiscent, falling away from the septum at maturity. Seeds I in each cell ; cotyle- 

 dons narrow, incumbent or conduplicate. [Greek, crow-foot, from the shape of 

 the leaves. ] About 6 species, of wide distribution. 



Pod rugose, not crested. 1. C didymus. 



Pod coarsely wrinkled, crested. 2. C. Coronopus. 



i Coronopus didymus (L.) J. E. Smith. Lesser Wart-cress. (I. F. f. 

 1690.) Tufted, spreading on the ground, sparingly pubescent. Stems 0.5-4 dm. 

 long; leaves deeply i-2-pinnatifid ; flowers white, racemose ; pedicels slender, 2-3 

 mm. long in fruit ; pod about 2 mm. broad and slightly more than I mm. high ; 

 valves obtuse at each end and readily separating into 2 ovoid nutlets. In waste 

 places, Newf. to Fla., Mo. and Tex., west to Cal. Summer. Nat. from the south. 



2. Coronopus Coronopus (L. )Karst. Wart or Swine's Cress. (I. F. f. 

 1691.) Tufted, spreading on the ground, succulent, glabrous and glaucous, 

 or with a few >preading hairs. Leaves similar to those of the last species, gen- 

 erally larger, sometimes less divided; flowers similar; pedicels stout, 2 mm. long or 

 less ; pod 4 mm. broad and about 3 mm. high, flatfish, rounded, apiculate at the 

 summit, marked with coarse wrinkles which form a crest around the margin; valves 

 not distinctly separate. In waste places and on ballast, N. B. to Fla. and Tex., 

 and on the Pacific Coast Fugitive or adventive from Europe. Summer. 



6 THLASPI L. 



Erect glabrous herbs, with entire or dentate leaves, those of the stem, or at least 



the upper ones, auriculate and clasping. Flowers white or purplish. Siliques ob- 



cuneate, obcordate, or oblong orbicular, mostly emarginate, flattened at right 



angles to the narrow septum, crested or winged. Valves dehiscent. Seeds 2 or 



