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CLASS XIV TETRADYNAMIA. 
ORDER I. SILICULOSA. 
296. DRABA. Gen. pi. 1076. {Cruciferte.) 
Silicle entire, oval-oblong, valves flattish, 
parallel with the dissepiment. Style scarce- 
ly any. ? 
Tema, 1. D. scape naked, leaves oblong-acute, subser- 
rate, hairy^ petals bifid, stigma sessile. — Willd, 
D. hispidula, Mich. 
D. verna, /8. Americana, Pers. 
Icon. FI. Dan. 983. Engl. Bot. 586. 
Whitlow -grass. Shad-blossom. 
A very humble plant, but extremely interesting, because it 
is the earliest blooming plant of our country. It is often found 
in flower in the last of February or early in March, when only 
one -half or three quarters of an inch high. It afterwards ac- 
quires a greater size, and sometimes is four inches high. It 
flowers twice in the season. Annual. 
279. LEPIDIUM. Gen.pl. 1077. (Crucifera.) 
Silicle emarginate^ elliptic^ cells 1 -seeded^ 
valves carinate^ dissepiment contrary. 
viiginicum. radical leaves pinnatifid, stem leaves linear- 
lanceolate, siib-cut-serrate ; flowers 4-petailed, 
diandrous, silicle lentiform. — Willd. SLiiAPursh. 
Icon. Sloan. Jam. l.t. 123. f. 3. (Pursh.) 
Wild Pepper-grass or Pepper-wort. 
From twelve to fifteen inches high. Flowers very minute. In 
stony roads and way-sides, on dry soil, and in dry fields, every 
where common. Whole plant tastes pepperish. Biennial. All 
summer. 
