Genus I/ 



MUSTARD FAMILY, 



2. Lepidium Draba L. Hoary Cress. 

 Fig. 2038. 



Lcpidinin Draba L. Sp. PI. 645. I753- 



Perennial, erect or ascending, io'-i8' high, 

 hoary-pubescent, branched at the inflorescence. 

 Leaves oblong or lanceolate-oblong, obtuse, 

 slightly dentate or entire, li'-2' long, the lower 

 petioled, the upper sessile and clasping; pedicels 

 slender, ascending or spreading, 3"-6" long in 

 fruit; flowers white, about l"-2" broad; pods 

 very broadly ovate, or cordate, li" long, 2" broad, 

 arranged in short corymbose racemes; valves dis- 

 tinct, papillose, keeled, wingless, tipped with a 

 slender style "-i" long. 



Waste grounds. Astoria and Syracuse, N.Y., Wash- 

 ington, D. C. and on ballast about the seaports. 

 Also from Colorado and Wyoming to California and 

 British Columbia. Fugitive from Europe. Native 

 also of Asia. April-June. 



3. Lepidium ruderale L. Roadside or 

 Narrow-leaved Pepper-grass. Fig. 2039. 



Lepidium ruderale L. Sp. PI. 645. i753- 



Annual, erect, 6-15' high, glabrous, wiry, freely 

 branching. Basal and lower leaves oblong in 

 outline, i'-4' long, 1-2-pinnatifid into linear or 

 oblong obtuse segments ; upper leaves smaller, 

 entire or with a few lobes ; flowers J" broad or 

 less, greenish ; petals none ; stamens 2 ; pods flat, 

 not margined, about i" in length, short-oval; 

 pedicels spreading or somewhat ascending, very 

 slender, ll"-2" long in fruit; valves sharply 

 keeled, barely winged ; seeds marginless ; coty- 

 ledons incumbent. 



In waste places, on ballast and along roadsides 

 about the cities, Nova Scotia to Texas, and recorded 

 from Bermuda. Naturalized from Europe. Has the 

 iinpleasant odor of wart-cress. Occurs also in Aus- 

 tralia. Summer. 



4. Lepidium virginicum L. Wild Pepper- ft^( 

 grass. Fig. 2040. 



Lepidium virginicum L. Sp. PI. 645. 1753. 



Basal leaves obovate or spatulate in outline, 

 generally with a. large terminal lobe and numerous 

 small lateral ones, all dentate, glabrous or slightly 

 pubescent; stem-leaves lanceolate or oblong- 

 linear, sharply dentate or entire, sessile, or the 

 lower stalked; flowers i"-l" broad, white, petals 

 generally present, sometimes wanting in the later 

 flowers; stamens 2; pedicels very slender, spread- 

 ing, 2"-3" long in fruit ; pod flat, short-oval or 

 orbicular, minutely winged above; cotyledons ac- 

 cumbent. 



In fields and along roadsides. Quebec to Minne- 

 sota. Colorado, Florida. Texas and Mexico. Also in 

 the West Indies, and introduced as a weed into south- 

 ern Europe. Bird's-pepper. Tongue-grass. May- 

 No v. 



