40 CRUCIFERA, 
Tribe THLASPIDER. 
17. BISCUTELLA. 
Biscutella, Linn. Gen. Plant. n. 808 ; Benth. et Hook. Gen. Plant. i. p. 91. 
Several Mediterranean species and one Californian besides the following :— 
1. Biscutella (Dithyrea) Wislizeni, Engelm. Bot. Wisliz. Exped. p. 11, adnot. 
Trexas.—NortH Mexico, common along the valley of the Rio Grande del Norte. 
| . 18. THLASPI. 
Thlaspi, Linn. Gen. Plant. n. 802; Benth. et Hook. Gen. Plant. i. p. 91. 
About thirty species, inhabiting temperate and frigid regions, chiefly in the northern 
hemisphere. Rare in South America and Australia; absent from South Africa. 
1. Thlaspi Fendleri, A. Gray, Pl. Wright. ii. p. 15. 
Texas.—Norta Mexico, Guadalupe Pass, Sonora (Parry). 
Tribe ISATIDER. 
19. THYSANOCARPUS. 
Thysanocarpus, Hook. Fl. Bor.-Am. i. p. 69; Benth. et Hook. Gen. Plant. i. p. 94. 
About six species, inhabiting oregon and California, one occurring in Guadalupe 
Island. 
1. Thysanocarpus curvipes, Hook. Fl. Bor.-Am. i. p. 69, t. 18. 
Thysanocarpus pulchellus et elegans, Fisch. et Mey. Ind. Sem. Hort. Petr. 1835, p. 50; Hook. Ic. 
Pl. t. 39. 
Catrrornta and New Mzxico to—Norra Mexico, Sonora (Parry). 
Tribe CAKILINEZ. 
20. CAKILE. 
Cakile, Gertn. Fruct. ii. p. 287, t. 141; Benth. et Hook. Gen. Plant. i. p. 99. 
Two species—one confined to Europe, and the other widely dispersed. 
1. Cakile maritima, Scop. Fl. Camiol. n. 844; DO. Prodr. i. p. 185. 
Cakile americana, Nutt. 
On the eastern coast and shores of the great lakes of North America from NEWFOUND- 
LAND and MassacuuserTs, southward to—Sovra Mexico, Barra de Tuspan (Berlandier, 
86), Campeche ? (Linden).—Also in Evrorz ; and Phillip Island, Austrania. Hb. Kew. 
[Raphanus raphanistrum, Linn., is naturalized in Mexico, and occurs in the collec- 
tions of many travellers. ] 
