76 SENEBIERA. LCLASS XV. ORDER I. 



shire; Glastonbury received its name from Glaslum, which was the 

 old name of the plant. 



The introduction of Indigo into Europe as a dye was not effected 

 without difficulty, and the growers of Woad prevailed upon several 

 Governments to prohibit its being used, especially in Germany, 

 and it is not until within a very late period that its use has been 

 allowed without restrictions. 



GENUS IV. SENEBIE'RA. POIR. Wart-cress. 

 Nat. Ord. CBUCIF'ERJE. Juss. 



GEN. CHAR. Silicula two lobed, (didyma), laterally compressed, 

 entire or notched at the apex, two celled, each cell single seeded. 

 Seeds roundish, with linear incumbent cotyledons. (c Fig. 2, 

 page 872.) Named in honour of the Rev. M. Senebier, of 

 Geneva, a distinguished physiological botanist. 



1. S. Corono'pus, Pair. (Fig. 1008.) Common Wart-cress, or Swine's- 

 cress. Leaves pinnatifid, with entire or cut lobes ; silicula sub-reni- 

 form, compressed, the valves wrinkled, the margin striated and toothed; 

 style prominent. 



De Candolle Prod. 1. p. 203. English Flora, vol. iii. p. 179. 

 Coronopus Ruelli. English Botany, t. 1660. Lindley, Synopsis, p. 

 30. Hooker, British Flora, ed. 4. vol. i. p. 246. 



Root long, tapering, branched. Stems numerous, branched, spread- 

 ing, close to the ground, leafy, smooth, compressed, and somewhat 

 angular. Leaves alternate, a glaucous green, deeply pinnatifid, with 

 entire or cut segments, the petiole long, flat, smooth. Inflorescence 

 stalked, sub- corymbose, clusters of numerous small white flowers. 

 Calyx of four small equal ovate concave spreading deciduous pieces. 

 Corolla of four equal obovate or oblong white or greenish petals. 

 Stamens with simple filaments and roundish two lobed anthers, fre- 

 quently some of the stamens are wanting. Style short, stout, conical. 

 Stigmas obtuse. Fruit an ovate or sub-reniform silicula, of two 

 spreading lobes, rough, with elevated reticulated lines, striated towards 

 the margin, and toothed on the edge, two celled, each cell containing 

 a compressed pendulous seed. 



Habitat. Footpaths and road sides, not unfrequent in England and 

 Ireland ; rare in Scotland, and found chiefly about Edinburgh. 



Annual ; flowering in September and October. 



2. 5. didym'a, Persoon. (Fig. 1009.) Lesser Wart-cress. Leaves 

 pinnatifid, with entire or cut lobes; silicula emarginate, of two com- 

 pressed wrinkled lobes ; style very short. 



English Flora, vol. iii. p. 180. S.pinnatifida,De Cand. Prod. 1. 

 p. 203. Lepidium didymum, Linn. English Botany, t. 248. 



