26 CRUCIFER^. 



C. Armoracia, Linn. : root large, fleshy ; radical leaves on long petioles, 

 oblong, crenate ; cauline long-lanceolate, serrate or entire ; pouch^blong ; 

 stigma dilated, nearly sessile. 



Waste grounds. June. %: — Root large and very pungent to the taste. Stem 

 2 — 3 feet high. Flowers wliite, in elongated racemes. Introduced, and exten- 

 sively cultivated. Used as a condiment. Horse Radish. 



7. LEPIDIUM. Linn. — Pepper-grass. 

 (From the Greek \emi, a scale ; in allusion to the form of the pouch.) 

 Pouch ovate or somewhat cordate ; valves keeled or rarely 

 ventricose, dehiscent; cells 1 -seeded. Seeds somewhat triquet- 

 rous or compressed. Petals equal. 



1. L. Virginicum Linn. : stem branched ; radical leaves pinnatifid : cau- 

 line linear-lanceolate, serate, smooth : stamens often 2 ; pouch orbicular, 

 flat, emarginate, shorter than the pedicel. Thlaspi Virginianum Poir. 



Sandy fields. Can. to Lovus. W. to Miss. June — Oct. (1). — Stem a foot 

 high, branched above. Flowers minute, white. Pouch about 2 lines long, 

 slightly emarginate. Wild Pepper-grass. 



2. L. campestre Brown : cauline leaves sagittate, toothed ; pouch ovate, 

 winged, rough with minute scales, emarginate ; style scarcely longer than 

 the notch. Thlaspi campestre Linn. 



Waste places. Long Island, Staten Island, and elsewhere in the U. S. 

 lune, July. (I) or (g). — Stem a foot high, erect, simple or paniculately branched 

 above. Racemes much elongated in fruit. Flowers white. Introduced. 



Field Pepper-gras9i 



3. L. Smithii Hook : cauline leaves sagittate, toothed ; pouch ovate, 

 emarginate, winged, smooth or minutely scaly on the back ; style much 

 eiserted beyond the notch. L. hirtum Beek Bot. 1st Ed. 



Fields near New Brunswick, N. J. June, (f) 1 — Stem 12—18 inches high, 

 very leafy. Lower leaves petioled, and somewhat pinnatifid ; cauhne sub- 

 clasping, sagittate, toothed, covered with a whitish pubescence. Flovjers in 

 dense hairy racemes. Pouch, in my specimens, scabrous, emarginate, with a 

 style about half its length. Perhaps introduced. Rough Pepper-grass. 



8. CAMELINA. Crantz. —Ceimelinei. 



(From the Greek xa/^rt'* dwarf or humble, and \ivov,jlax ; on account of a fan- 

 cied resemblance in the plants.) 



Pouch obovate or subglobose; valves ventricose, dehiscent 

 with part of the style ; cells many-seeded. Style filifonn. Seeds 

 oblong, not njargined. 



C. saliva D. C. : pouch obovate, pyriform, margined, tipped with the 

 pointed style ; leaves roughish, sub-entire, lanceolate, sagittate ; flowers nu- 

 merous, in corymbs. Myagrum sativum Linn. 



Cultivated grounds. N. Y. and Penn. May, June. (T).— Sfem 2— 3 feet high, 

 panicled above. Flowers numerous, corymbose, paniculate, small yellow. 

 Pouches large, on long slender pedicels. Introduced from Europe. 



Gold of Pleamire. 



