M THE CRUCIFEB FAMILY. [Brassica. 



is not so distinct, the persistent style is more conical at the base than 

 in Barbarea, and very much longer than in Sisymbrium. 



Upper stem-leaves entire, sessile, or clasping the stem. 

 All the leaves glabrous and glaucous, the upper ones not 



auricled 4. . oleracca. 



Radical leaves more or less hispid, the upper ones auricled at 



the base 5. B. campestrit. 



All the leaves pinnately cut or stalked. 

 Six or fewer seeds in each cell of the pod. 

 Pods slender and short, closely pressed against the axis of 



the raceme. Beak small. 



Pods ending in a slender style, slightly conical at the base 8. B. nigra. 

 Pods ending in a distinct beak, thickened at the base . . 9. B. adpressa. 

 Pods more or less spreading in a loose raceme. Beak large. 

 Pod very hispid, rather shorter than the long flat beak . C. B. alba. 

 Pod glabrous, or rough, rather longer than the conical beak 7. B. Sinapis. 

 Ten, tivelve, or more seeds in each cell of the pod. 



Pod li to 2 inches, the beak distinct, with 1 or 2 seeds . . 3. B. monemns. 

 Pod slender, not 1 inch long. The beak very short, with- 

 out seeds. 



Branched and leafy perennial, a foot high or more . . 1. B. tenuifolia. 

 Low annual, the leaves mostly radical 2. B. muralis. 



Besides the above, a variety of JB. Erucaslrum, Vill., a common roadside 

 weed in some parts of continental Europe, has been found near Saffron 

 Walden, and is said to have sown itself in the neighbourhood, but can 

 scarcely claim as yet to be admitted in our Floras. It is an erect 

 annual, with the habit and pinnatifid or pinnate leaves nearly of B. 

 monensis, but the pod has a very short seedless beak. 



1 . B. tenuifolia, Boiss. (fig. 76). Wall B., Rocket. A loosely branched 

 or bushy perennial, 1 to 2 feet high, perfectly glabrous and somewhat 

 glaucous, emitting a disagreeable smell when rubbed. Leaves very 

 variable, mostly irregularly pinnate, 2 to 4 or 5 inches long, with a few 

 lanceolate or oblong, entire or coarsely toothed segments, the upper 

 leaves often entire or nearly so. Flowers rather large, lemon-coloured. 

 Pods in a loose raceme, about 1 inches long, slender, spreading, with 

 numerous small seeds distinctly arranged in two rows. Diplotaxis 

 tenuifolia, D.C. 



On old walls, ruins, and waste places, in central and southern Europe 

 to the Caucasus, extending northwards to southern Sweden. In 

 Britain chiefly in southern England. Ft. the whole summer. 



2. B. muralis, Boiss. (fig. 77). Sand B.An annual, branching 

 from the base, usually about (5 inches high, with the same smell as the 

 last. Leaves mostly radical, or crowded at the base of the stems, less 

 deeply divided than in B. tenuifolia, and often only sinuate. Flowers 

 much smaller, the pods and seeds similar, but also smaller. B. brevipes, 

 Syme. Diplotaxis muralis, D. C. 



In fields, cultivated and waste places, very common in southern and 

 scattered over central Europe. In Britain abundant in some of the 

 sf uthern counties of England, and near Portmarnock, in Ireland, and 

 appearing occasionally further north, especially near the sea. Fl. all 

 summer. [Var. L>abingtonii, Syme, is a biennial or perennial variety.] 



3. B. xnonensis, Huds. (fig. 78). Isle of Man .5. Either an annual 

 or forming v stock of longer duration, glabrous, or bearing a few stiff 

 hairs at its base. Stems sometimes barely 6 inches high, with the 

 leaves mostly radical, sometimes loosely branched, above a foot high, 



