CRUCIFER. 219 
Rootstock branched, producing barren tufts of radical leaves 
and zigzag stems 1 to 2 feet long, corymbosely branched at 
the summit. Radical 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 4 inch long. 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 papillee. 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. 
