2853.
ALYSSUM calycinum.
Calycine Alyssum.
TE TRAD YNAMIA Siliculosa.
N at. Ord. Cruciferce (Brassicacea).
Gen. Char. Silicula circular or elliptical, valves being
flat or convex in the centre. Seeds 2-4 in each
cell, compressed, sometimes surrounded with a
membranous border. Calyx equal at the base.
Some of the stamens toothed.—DeCand.
Spec. Char. Annual. Stems herbaceous, spreading.
Leaves linear-lanceolate, hoary. Calyx persistent.
(Corolla yellow, whitening with age.)
Seed-vessels round, subemarginate, pubescent,
four times longer than the style.—DeCand.
Syn. Alyssum calycinum, Lin. Spec. PI. 908. Br.
in Hort. Kew. v. 4.94. Willd. Spec. PL v. 3 .464.
Pers. Synops. v. 2. 192. DeCand. Syst. 2. 315.
Ibid. Prodr. v. 1. 163. Spreng. Syst.v. 2. 861.
Clypeola alyssoides. Lin. Spec. PI. ed. 1. 652.
Crantz Stirp. Austriac. 19.
Jt^iOOT annual. Stems several, ascending, simple or
branched, leafy, and, as well as the whole plant, hoary with
stellate pubescence. Leaves linear-spathulate (scarcely lanceolate),
erect. Racemes terminal, very long, crowded. Calyx
about as long as the pedicel; its leaflets lanceolate, erect,
persisting, clothed with longer hairs than the rest of the plant.
Flowers small. Petals yellow, longer than the calyx, mar-
cescent, and becoming white, linear, emarginate. Silicle
circular, slightly notched, having a pubescence similar to