920 DIPLOTAXIS. [CLASS XV. ORDZR II. 



Hooker, British Flora, ed. 4. vol. i. p. 257. Prim. Fl. Sarn. ined. 

 " Pods glabrous or liairy, wilh a glabrous beak, each of its valves 

 with one nerve. Seeds ovate, compressed." Babington. 

 Habitat. On the Quenvais, Jersey, but rare. 

 Biennial ; flowering in July and August. 



This plant we do not know as a native of Britain, and have given 

 its description from Hooker. It is found frequently in the Southern 

 parts of Europe, and from a specimen collected in France our drawing 

 is made. 



GENUS XXVI. DIPLOTAX'IS. Da CAND. 

 Wall Mustard. 



Nat. Ord. CRUCIF'ERJB. Juss. 



GEN. CHAR. Siliqua linear, or linear lanceolate, valves convex, wilh 

 a longitudinal rib. Calyx spreading. Seeds ovate or oblong, 

 compressed. Cotyledons incumbent, channeled, conduplicate. 

 (See Fig. 3, p. 872.) Name from JiTrXoj, double; and -raf*?, 

 order ; so called on account of the seeds being in two rows. 

 1. D. tenui'folia, De Cand. (Fig. 1063.) Fine-leaved Diplotaxis, or 

 Mustard. Siliqua linear, smooth, erect, on long slender pedicles ; 

 styles short; leaves smooth, lanceolate, the lower ones oblong, lanceo- 

 late, pinnatifid, with oblong entire or toothed lobes; stem smooth. 



De Cand. Prod. 1. p. 222. Lindley, Synopsis, p. 33. Sisymbrium 

 tenuifolium, Linn. English Botany, t. 625. Sinapis tenuifolia, Br. 

 English Flora, vol. iii. p. 223. Hooker, British Flora, ed. 4. vol. i. 

 p. 257. 



Root tapering, somewhat woody. Stem erect, from one to two feet 

 high, round, smooth, branched, woody at the base. Leaves numerous, 

 smooth, dark glaucous green, somewhat fleshy, the lower ones oblong, 

 lanceolate, petiolated, irregularly sinuated and lobed in a pinnatifid 

 manner, and the lobes are oblong, or linear and toothed, or cut, or 

 entire. Inflorescence sub-corymbose clusters of pale lemon coloured 

 flowers, of an unpleasant odour, in fruit much elongated lax racemes. 

 pedicles long, spreading, the calyx of four oblong spreading pieces, 

 somewhat hairy at the apex. Petals roundish, ovate, tapering into 

 a short claw. Fruit a smooth linear erect siliqua, sessile upon the 

 pedicle, or with a short stalk, the valves with a prominent dorsal rib, 

 the style short, thick, crowned by the obtuse stigma, depressed and 

 emarginate. Seeds ovate, pale brown, disposed in two rows in each 

 cell. 



^ Habitat. Old walls. In the South, Soulh-West, and East of 

 England; at London, Bristol, Yarmouth, Chester, Coast of Fife, 

 Scotland. 



