38 CRUCiFER*. [Sinapis. 



Stem 3 — 4 feet high, with copious smooth slender branches. Lower stem-leaves 

 very large, lyrate, the terminal lobe roundish, very rough on both sides, but occa- 

 sionally glabrous, dark green, those above more or less approaching to entire, the 

 uppermost mostly quite so, stalked and pendant. Flowers smaller than in the two 

 following species, golden yellow. Sepals linear, coloured, widely spreading, their 

 edges involute, scarcely longer than the sleuder claws of the rounded entire petals. 

 Hypogynous glands greenish. Pods in long clusters, linear, erect, closely applied 

 to the stem or partly a little patent, from ^ an inch to an inch in length, brownish, 

 pedicellate, glabrous, tetragonous, the 2 dorsal angles moie sharply keeled than 

 the sutural, and hence the siliques appear 2-edged, abruptly terminating in the 

 short, straight, narrow beak or rather style, tipped with the 2-lobed stigma. Seeds 

 mostly 4 in each cell, ovato-globose, clear brown, minutely punctate all over. 



2. S. alba, L. White Mustard. " Pods hispid turgid shorter 

 and slightly narrower than the flat ensiform beak, leaves pinna- 

 tifid."— ^r. Fl. p. 41. El B. t. 1677. 



In cultivated ground, waste places, on banks and by roadsides, chiefly in the 

 East and South-east parts of the island, not unfrequent. Fl. May — July. 0. 



E. Med. — About Byde. Plentiful all about Ventnor. In Sandown bay on 

 steep sea-banks, also between the bay and Yaverland. Shanklin chine. 



W. Med.— Co^es. Freshwater, B. T. W. 



Root hard, white, tapering, sometimes copiously branched, and with many 

 \\ oolly fibres. Stem erect, from 1 — 3 feet high, much branched, hollow, angular 

 and deeply furrowed, purplish below, hispid with deflexed bristly hairs. Leaves 

 all lyrate or lyrato-pinnatifid, roughish, various in size and in the shape of the 

 lobes, which are usually 5 — 7 cut or toothed, terminal one usually confluent with 

 the next pair beneath it, the lower ones much smaller and quite distinct. Floivers 

 numerous, rather large, bright yellow. Siliques in long racemose clusters, 

 stalked, the lower ones spreading, those towards the summit somewhat erect or 

 patent, whitish brown, about 1^ inch long ; valves tumid or beaded, hispid with 

 short bristles pointing forward, and copious veiy minute reflexed ones, each valve 

 with 5 strong prominent ribs, and one or two less distinctly marked. Beak usu- 

 ally much longer than the valves, ensiform, curved upwards or sometimes nearly 

 straight, flat, with thin sharp edges, 3-ribbed on each side, rough but less so than 

 the valves, and tipped with the stigma. Seeds 2 — 4 in each cell (rarely more than 

 3) and very commonly one in the base of the beak, globular, scabroso-punctate, 

 various in colour, pale reddish, whitish or blackish brown and mottled. 



3. S. a/TOisis, L. Charlock. Wild Mustard. " Pods glabrous 

 with many angles turgid and knotty longer than the slightly com- 

 pressed beak, stem and leaves bristly." — Br. Fl. p. 41. E. B. t. 



1748. 



In waste and cultivated ground but too abundant ; an odious weed in tillage- 

 land. Fl. May — August. 0. 



" Stem 1 — 2 ft. high rough. Flowers rather large yellow. C'afyx very spread- 

 ing. Beak of the pod usually empty, sometimes with one seed.'' — Br. FL 



Suborder II, SILICULOS,^. 



Fruit a short broad pod or pouch (Silicule). 

 * Pouch 2-valved, dehiscent. 



Division I. Latiseptjd. 



Pouch short, opening with two flattish or convex valves ; dissepiment broad in 

 the major transverse axis of the fruit. 

 Tr. AlyssineiE. Cotyledons o=. 



