140 
TETRADYNAMIA SILICULOSA. 
lo porrecto; corymbis style prominent; co- 
paucifloris. rymb few flowered. 
Pursh 2. p. 435. Nutt. 2. p. 64. 
This plant which I have inserted from Pursh and Nuttall has escaped K 
my observation. It is said to grow in pastures intermingling with the C* 
Didyma, and to be a larger species. 
LEPIDIUM. Gen. Pl. 1077. 
Silicula emargina- 
ta, cord at a, polysper- 
ma. Valvulis cari- 
natis dissepimento 
contrariis. 
Pod emarginate, 
cordate, many seeded. 
Valves keeled, with a 
transverse partition. 
1. VlRGINICUM- 
L. foliis radicali- 
bus pinnatifidis, cauli- 
nis lineari lanceolatis, 
subinciso serratis ; 
floribus 4-petaIis, di- 
andris ; siliculis lenti- 
formibus. 
Radical leaves pin- 
natifid, those of the 
stem linear lanceolate, 
deeply serrate ; flow- 
ers 4-petalled, dian- 
drous ; pod lens sha- 
ped. 
Sp. pl. 3. p. 440. 
Walter 175. 
Mich. 2. p. 27- Pursh 2. p. 435. Nutt. 2. p. 64. 
Root perennial. Stem herbaceous, 12 — 15 inches high, glabrous. 
Leaves alternate, sessile, finely ciliate, more or less deeply notched, the 
upper ones diminishing in size, and nearly entire. Flowers in terminal 
racemes. Calyx 4-cleft, leaflets lanceolate^-^appressed, membranaceous 
along the margin, pubescent on the back, deciduous. Petals 4, white, ob- 
ovate, a little longer than the calyx. Glands 4, very small, at the base 
of the germ. Filaments 2, sometimes 3, as long as the calyx. Anthers 
incumbent. Germ orbicular, compressed. Style 0. Stigma globose. 
Pod orbicular, compressed, slightly emarginate, 2 celled. Seeds 1 in 
each cell. 
Grows in pastures and about buildings. Very common. 
Flowers April — May. 
