CRUCIFERZ. 219 
Rootstock branched, producing barren tufts of radical leaves 
and zigzag stems 1 to 2 feet long, corymbosely branched at 
the summit. MJadical leaves stalked, dentate or sinuate, those 
on the flowering stems decayed by the time the flowers expand ; 
lower stem leaves much narrowed towards the base, where they are 
again expanded into 2 small acute auricles; upper leaves varying 
from ovate to lanceolate, with very large acute (or more rarely 
obtuse) auricles meeting in front of the stem. Flowers white, about 
+ inch across, with the petals broadly obovate, attenuated into a 
long slender claw. Fruiting raceme short. Pedicels spreading, 
about $inchlong. Pod (exclusive of style) about } inch long by + 
broad when equally developed; but this is rarely the case, as one 
of the valves is usually larger than the other, and the seed in the 
smaller valve is generally abortive; valves much contracted where 
they meet each other, so as to carry the seed with them when 
they fall off; the surfaces with small vesicular papille. Seeds dark 
brown. Plant sub-glabrous or with adpressed hairs, glaucous. 
Whitlow Pepperwort. 
French, Passerage Drave. 
GENUS XXV.—-SENEBIERA. D.C. 
Sepals short, spreading, equal at the base. Petals equal, entire, 
or none. Stamens without wings or appendages, 2 or 4 of them 
sometimes abortive or absent. Pod compressed at right angles 
to the replum, transversely ovoid or reniform, with radiating or 
transverse irregular ridges, notched or pointed at the apex, con- 
stricted between the valves so as to be didymous; valves without 
wings, not separating, or, if they do, closed over the seed and 
carrying it with them; style none, or short. Seeds 1 in each cell 
of the pod, roundish-ovoid, scarcely compressed. Embryo with 
the cotyledons folded over on themselves above the base. 
Small annual or biennial herbs, diffusely branched ; primary 
axis reduced to a sub-sessile leafless inflorescence. Flowers small, 
white, in lateral and terminal corymbs afterwards lengthening 
into short racemes. 
This genus of plants was named in honour of John de Senebier, of Geneva, a 
vegetable physiologist. 
