26 CRUCIFER,E. 



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

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

 stigma dilated, nearly sessile. 



Waste grounds. June. 1|_. Root large arid very pungent to the taste. Stem 

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

 sively cultivated. Used as a condiment. Horse Radish. 



7. LEPIDIUM. Linn. Pepper-grass. 

 (From the Greek \erns, a scaU ; 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 Pair. 



Sandy fields. Can. to Louis. W. to Miss. June- Oct. . Stem a foot 

 high, branched abo\c. 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. 

 June, July. (J) or @. Stem a foot high, erect, simple or paniculately branched 

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



Field Pepper-grass. 



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

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

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



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

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

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

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

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



8. CAMELINA. Cranbz. Camelina. 



(From the Greek x a /* ai > dwarf or humble, and \ivov, flax ; 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 filiform. Seeds 

 oblong, not margined. 



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, (p. Stem 2 3 feet high 

 panicled above. Flowers numerous, corymbose, pam'culate, small yellow 

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



, Gold of Pleasure. 



