222 ENGLISH BOTANY. 
the upper side than on the lower. Seeds resembling those of 
S. didyma, but scarcely curved and twice as large. Plant deep 
green, rather fleshy, entirely glabrous. 
Common Wart Cress, Swine’s Cress. 
French, Sénébiere Corne de Cerf. German, Gemeine Feldkresse. 
This little plant has a very active flavour of a mustard and cress character, every 
part of it, seed-pods and all, partaking of it. It is called Swine’s Cress, because pigs 
are said to indulge in it. 
Trine XI.—ISATIDE. 
Cotyledons flat, i.e. bent over close to the base, with the 
radicle lying on the back of one of them (incumbent). Pod short 
and rather broad, compressed at right angles to the plane of 
the junction of the valves (there being no replum), 1-celled and 
1-seeded ; valves not separating at all, or only opening a little way. 
GENUS XXVI—ISATIS. Linn. 
Sepals spreading, equal atthe base. Petals equal, entire, with 
short claws. Stamens without wings or appendages. Pod oval- 
oblong or linear, flattened, the greater portion of it consisting 
of the enormously developed wings of the valves; the cell itself 
occupying a small space in the middle, and containing a single 
seed; valves not separating; stigma sessile. Seeds prismatic- 
cylindrical, not margined. | 
Annual or biennial, erect, branched herbs, with the stem 
leaves sagittate. Flowers generally yellow, in compound corym- 
bose panicles made up of numerous small simple corymbs, which 
lengthen into very short racemes in fruit. Pedicels very slender. 
Pod large, pendulous, articulated to the pedicels. 
The name of this genus comes from icalw (isazo), to render equal, the plant being 
supposed to destroy by its application all roughness and inequalities of the skin. All 
the species yield a blue dye, which is used by dyers. It is often used as a substitute 
for indigo, which it greatly resembles. 
SPECIES IL-ISATIS TINCTORIA. Linn. 
Piate CLXI.* 
Reich. Ic. Fl. Germ. et Helv. Vol. II. Zetr. Tab. IV. Fig. 4177. 
Radical leaves slightly denticulate or crenate; stem leaves 
* Drawn from E. B. 97, and corrected from a Guildford specimen by Mr. J. E. 
Sowerby. 
