CRUCIFERS. 195 
terminating in bristles at the edges, but the surfaces glabrous. 
Petals very faintly notched at the apex. Raceme elongating a 
little after flowering. Pedicels spreading, conspicuously longer 
than the pods. Pods elliptical-lanceolate, compressed, not twisted ; 
style as long as the diameter of the pod. 
Very rare. On rocks at Pennard Castle, and at the Worm’s 
Head, Glamorganshire. 
England. Perennial. Spring. 
Rhizome slender, branching, producing dense cushion-like tufts. 
Leaves spreading in very compact rosettes, much narrower and 
more rigid than in any other British species of this genus. Stems 
2 to G inches high. Flowers bright yellow, 3 inch across. Fruit 
pedicels } to 8 inch long. Pod, exclusive of style, } to § inch long, 
rather more than twice as long as broad, acute at the apex, and 
terminated by the long straight style. Seeds about 10 or 12 in 
each cell of the pod, yellowish brown, larger than those of any of 
the other British species of Draba, being about 7g inch long. 
Leaves dark green, somewhat shining. 
The leaves of this plant remain for a long time after they 
wither, so that the rosette is surrounded by numerous rows of 
dead leaves, giving to the old stems somewhat the appearance of a 
bottle-brush. 
Sea-green Whitlow Grass, Yellow Alpine Whitlow Grass. 
French, Drave, Faux Aizoon. 
GENUS XVI—ALYSSUM. Linn. 
Sepals short, erect, or somewhat spreading, equal at the base. 
Petals equal, entire, notched or bifid, with short claws. Filaments 
or some of them very often with wings or appendages. Pod 
roundish, obovate, oval, elliptical or rhomboidal, compressed parallel 
to the replum; valves flattish, convex, or convex in the centre 
only, often without a dorsal nerve; style short or elongated. Seeds 
2 to 10, oval, compressed. 
Branched herbs or undershrubs, generally thickly covered with 
stellate or (more rarely) simple hairs. Leaves generally narrow, 
entire. Flowers white or yellow, arranged in corymbs or short 
racemes, which generally afterwards elongate. 
The name of this genus is derived from the Greek words a, negative, and Avoca 
(Jussa), canine madness, because it was supposed to be a cure for madness. 
