120 CRUCIFERAE. [VOL. II. 



i. Diplotaxis tenuifolia (L.) DC. Wall Rocket. (Fig. 1705.) 



Sisymbrium tenuifolium L. Cent. PI. i : 18. 1755. 

 Diploiaxis tenuifolia DC. Syst. 3: 632. 1821. 



Perennial, glabrous or nearly so, somewhat 

 glaucous, stem branched, bushy, leafy, i-4 

 high. Leaves pinnatifid, often nearly to the 

 midrib, thin, the lower 3 / -6 / long, the lobes 

 distant or close together, mostly narrow; ra- 

 cemes elongated in fruit, loose: flowers 8"- 

 io // broad; pods \'-\]^ f long, about i#" 

 wide, nearly erect; pedicels slender, lo^-zo" 

 long in fruit. 



In waste places and ballast, Nova Scotia to New 

 Jersey and Pennsylvania, chiefly about the cities. 

 June-Aug. 



2. Diplotaxis muralis (L.) DC. 

 Sand Rocket. (Fig. 1706.) 



Sisymbrium murale I,. Sp. PI. 658. 1753. 

 Diploiaxis muralis DC. Syst. a: 634. 1821. 



Annual, branched from the base, sparingly 

 hispid or glabrous, the slender branches i- 

 2 high, leafy only below. Leaves oblanceo- 

 latc, sinuate-lobed or sometimes pinnatifid, 

 2'-4' long, narrowed at the base, mostly slen- 

 der- petioled;- fruiting racemes long, loose; 

 flowers 6"-%' f broad; pod about i' long and 

 i" wide, erect, flattish; fruiting pedicels 4"- 

 8" long. 



In waste places and ballast, range of the pre- 

 ceding species. June-Aug. 



14. RAPHANUS L. Sp. PI. 669. 1753. 



Erect branching mainly biennial herbs, with lyrate leaves and showy flowers. Silique 

 elongated-linear, coriaceous, fleshy or corky, constricted or continuous and spongy between 

 the seeds, indehiscent. Style slender. Seeds subglobose; cotyledons conduplicate. [Greek, 

 quick-appearing, from its rapid germination.] 



A genus of about 6 species, natives of Europe and temperate Asia. 



Flowers yellow, fading white; pod longitudinally grooved, 4-io-seeded. i. R. Raphanistritni, 



Flowers pink or white; pod not longitudinally grooved, 2-3-seeded. 2. R. sativus. 



