48 tttE CRUCIFER FAMILY. 



smaller, in looser racemes. Pod scarcely more than a line broad, but 

 slightly wrinkled, and separating into two ovoid nuts. Coronopus 

 didyma, Sm. 



[Supposed to be indigenous only in the Argentine provinces 'of South 

 America, and thence to have been introduced into the Old World.]. In 

 Britain on the coasts from Fife southwards, and S.W. Ireland. In 

 inland districts only as an occasional straggler. PL all summer. 



XXIV. ISATIS. WOAD. 



Erect annuals or biennials, with undivided leaves, the upper ones clasp- 

 ing the stem, and auricled. The flowers small, yellow, and numerous. 

 Pod flat, pendulous, obovate or oblong, with a strong rib on each side, 

 indehiscent and containing a single seed. Radicle incumbent 



A genus, spread over southern Europe and western Asia. 



1. I. tinctoria, Linn. (fig. 110). Dyer's W. Stems 18 inches to 2 

 or 3 feet high, branched in the upper part, glabrous and glaucous, or 

 with a few hairs in the lower part. Radical leaves obovate or oblong, 

 coarsely toothed and stalked, 2 to 4 inches long ; the upper ones 

 narrow and lanceolate, with prominent auricles. Pods hanging from 

 slender pedicels, generally about 7 or 8 lines long and 2 to 2 broad, 

 and tapering to the base, but somewhat differing in size and shape. 



Of south-eastern origin, formerly much cultivated in many parts of 

 Europe and Asia, and has thence become established in stony or waste 

 places, as far north as Sweden. Repeatedly found in several localities 

 in Britain, but scarcely fully naturalised [except near Tewkesbury, 

 where indeed it appears to be indigenous]. PL summer. 



XXV. CAKILE. CAKILE. 



Maritime branching annuals, with fleshy leaves and purplish or white 

 flowers. Pod oblong-linear, somewhat compressed, without any longitu- 

 dinal partition or valves, but, when ripe, separating transversely into 2 

 articles, the upper one mitre-shaped, deciduous, containing one erect 

 seed ; the lower one persistent, divided into two points, and contain- 

 ing a pendulous ovule, which seldom enlarges into a seed. Radicle 

 obliquely incumbent on the back or towards the edge of the coty- 

 ledons. 



A genus consisting of two species, spread over the sea-coasts of the 

 northern hemisphere, both in the New and Old World. 



1. C. xnaritima, Scop. (fig. 111). Sea C., Sea Rocket. Stems hard at 

 the base, with loose straggling branches a foot long or more, and 

 glabrous. Leaves few, thick and fleshy, with a few distant, oblong or 

 linear lobes. Flowers not unlike those of a Stock, but smaller. Pods on 

 short thick pedicels, distant from each other in long racemes, when 

 young linear or lanceolate and entire but when ripe forming the two 

 peculiar articles above described. Radicle remarkably large. 



In maritime sands and salt-marshes ; on all the sea-coasts of Europe 

 and western Asia, except the extreme north. Common all round Britain. 

 FL summer and autumn. 



