64 FLOKA OF ST. CROIX AND THE VIRGIN ISLANDS. 



430. E. canadensis, L. 



n. Junc-Kov. Eay-flowers often ligulate. Along roads, common. — 

 All islands. 



431. Baccharis Vahlii, DC. (Prod, v, 411) {B. dioica, Valil). 



Fl. all the year round. As much as 30' high. On rocky seashores, 

 gregarious, not uncommon. (The specific name of DC. is to be pre- 

 ferred to that of Vahl, notwithstan<ling the priority of the latter, for 

 the reasons stated in the Prodromus.) — St. Croix (northwestern coast). 



432. Pluchea odorata, Cass. (v. Sweet Sceut, Ovra bla). 



Fl. Feb.-April. Leaves used as tea against colds and as diuretic 

 medicine. In moist localities, not uncommon. — All islands. 



433. P. purpurascens, DC. 



Fl. all the year round. Along rivulets, not uncommon. — St. Croix 

 (Gallows Bay, Kingshill Gut). 



434. Pterocaulon virgatum, DC. 



Fl. all the year round. On dry hills, common. — All islands. 



435. Melampodium divaricatum, DC. (Prod, v, 520) {M. pahidosum, Kth.). 



Fl. Oct.-Feb. Along ditches, gregarious, rare. — St. Croix (Jolly Hill). 



436. Ogiera ruderalis, Oris. 



Virgin Islands (Gris. Fl. p. 3G9). 



437. Acanthosperniuin humile, DC. 



Fl. all the year round. Leaves not glandular beneath. A common 

 weed along roads. — St. Thomas. 



438. Xanthium macrocarpum, DC. (Prodr. v, r»23) (A', oricutale, L.). 



Fl. Oct.-Feb. A common weed, naturalized around dwellings. — All 

 islands. 



439. Partheniuni Hysterophorus, L. (v. Mnle-wocd, "White-lioad-broom). 



Fl. all the jear round. A very common weed everywhere. — All islands. 



440. Ambrosia artemisiaefolia, L. (3) triiiitensis. 



Fl. Sept.-Oct. Naturalized in waste places. — St. Croix (Fredrikssted). 



441. Zinnia mult-flora, L. (v. Snalco-llower). 



• Fl. Fcb.-Aug. Along roads, not uncommon. — Virgin Islands. 



442. Z. elegans, Jac(i. 



Fl. May-Oct. Naturalized in gardens. — All islands. 



443. Eclipta alba, Hassle. 



Fl. June-Feb. In moist localities, not uncommon. — All islands. 



