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L E P I D I UM petraeum.
Mountain Pepper-wort.
T E T R A D r N A M I A Siliculofa.
Gen. CfTAR. Pouch notched, with many feeds : valves
keeled, but not margined: partition contrary to
the valves.
Spec. Char. Leaves pinnated, entire. Petals not longer
than the calyx, llightly notched.
Syn. Lepidium petrasum. Linn. Sp. PL 899. HudJ.
FI. An. 280. With. Bot. Arr. 670.
Nafturtiolum montanum annuum tenuiffime divifum.
R a il Syn. 304.
W E are obliged for this rare little plant to John Adams,
Efq. wh6 gathered the fpeeimen early in March 1793 on a
limeftone wall in a very warm fituation about two miles from
Pembroke. It is alfo ftill found, as in Ray’s time, on St. Vincent’s
rocks near Briftol Hot-wells, as we are informed by Dr.
John Ford. *
Root biennial, taper and fibrous. Stem much and alternately
branched, fpreading. Leaves elegantly pinnated, or rather very
deeply pinnatifid, with an odd lobe -, their fegments oval, or
fpatulate, more or lefs pointed, entire, fmooth. Flowers in a
corymbus, gradually lengthened out into a fpike, very minute,
e r e C a l y x and corolla fpreading, the leaves of the former
ovate and concave; the petals fomewhat obovate, but narrow,
white, about the length of the calyx, or Ihorter, fometimes, but
not always, llightly notched at the tip. Stamina fix, of which,
from the fmallnefs of the flower, the inequality can fcarcely be
perceived, but the Ihorteft Hand remote from the others. Pouch
exactly oval, flat, with the remains of the ftyle in a minute
notch at the tip, fmooth: valves boat-like, with a lharp, but
upf dilated, keel. Seeds two in each cell, on {lender foot—
ftalks.
This fpecies has the proper pouch of a Lepidium. In fome
foreign ones that part fo nearly approaches to the pouch of
Thlafpi in figure, it is fcarcely poflible to define the limits of
the two genera.