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THLASPI campestre.
Common Mithridate Mustard.
TETRADYNAMIA Siliculosa.
Gen. Char. Pouch notched, inversely heart-shaped,
with several seeds: valves boat-like, their keels
forming the border: partition contrary to the
valves.
Spec. Char. Pouch roundish, sprinkled with glandular
dots, bordered at the upper part. Leaves arrow-
shaped, toothed, hoary.
Syn. Thlaspi campestre. Linn. Sp. PI. 902. Svi. Fl.
Brit. 684. Huds. 281. With. 569. Hull. 145.
Sibth. 199. Curt. Lond.fasc. 5. t. 45.
T. vulgatius. Rail Syn. 305.
T h i s is not an uncommon plant in cultivated ground,
though not mentioned in the Cambridge or Bedford Floras.
It flowers in July and August.
The root is annual, and tapering. Whole herb clothed
more or less with short hoary pubescence. Stem about a
foot high, branched above, round and leafy. Lower leaves
obovate; upper arrow-shaped, acute, clasping the stem; all
generally toothed, sometimes entire. Flowers small, white,
in small corymli soon lengthened out into very long spikes.
Petals spatulate, undivided, scarcely longer than the calyx.
Pouch roundish, protuberant, its border much dilated at the
upper edge, and notched where the style is inserted. Seed 1
in each cell. The sides of the pouch are clothed with
small glandular depressions, like little shining scales, by
which this species appears to us clearly distinguished from
the true T. hirtum, a plant we have received from Scotland
since the second vol. of Fl. Brit, was published. These
scales are much more certain than the want of hairs; for the
pouch of T. arvense is sometimes hairy, and then it becomes
the hirtum of Hudson, as we know by a specimen of his
own. There is a variety with smooth leaves.