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THLASPI perfoliatum.
Perfoliate Shepherd’s Purse.
TETRADYNAMIA Siliculosa.
Gen. Char. Pouch notched, inversely heart-shaped,
with several seeds: valves boat-like, their keels
formingtheborder: partition contrary to the valves.
Spec. Char. Pouch exactly inversely heart-shaped.
Stem-leaves heart-shaped, sharpish at the base,
clasping the stem, which is branched. Style
very short.
Syn. Thlaspi perfoliatum. Linn. Sp. PI. 9 0 2 . Sm.
FI. Brit. G8 5 . Huds. ed. 1. 2 4 6 . With. 569. Hull,
ed. 2 . 191. Sibth. 199. Jacq. Austr. t. 337.
T . alpestre. Huds. 282. Dicks. II. Sicc.fasc. 6. 5.
T . perfoliatum minus. Raii Syn. 305.
T . rotundifolium. Ger. em. 2 6 6 .
W e know not that this species of Thlaspi has been observed
any where in Britain, except in the limestone part of
Oxfordshire, about Witney and Burford, where it is abundant
in the spring, and from whence our specimen came.
The root is fibrous and annual. Stem branched from the
very bottom, except on poor ground, usually from four to six
inches high, spreading, roundish, smooth, leafy. Leaves
glaucous, smooth, slightly toothed; the radical ones stalked,
ovate, obtuse; the rest sessile, alternate, heartshaped, clasping
the stem with their, more or less acute, base. Flowers white,
small, in dense corymbose heads, gradually lengthened out
into long clusters of seed-vessels, which are precisely obcor-
date, smooth, glaucous, their lobes extending far beyond the
very short style. Stigma capitate. Seeds many in each cell.
The petals are blunt and undivided. The calyx spreading,
concave, purplish.