64 FLORA OF ST. CROIX AND THE VIRGIN ISLANDS. 



430. E. canadensis, L. 



% F1. June-No v. Bay -flowers often ligulate. Along roads, common. 

 All islands. 



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



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 Yahl, notwithstanding the priority of the latter, for 

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



432. Pluchea odorata, Cass. (v. Sweet Scent, 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. paludosum, Kth.). 



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



436. Ogiera ruderalis, Gris. 



Virgin Islands (Gris. Fl. p. 369). 



437. Acanthospermum humile, DC. 



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

 weed along roads. St. Thomas. 



438. Xanthium macrocarpum, DC. (Prodr. v, 523) (X. oricntale, L.). 



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

 islands. 



439. Parthenium Hysterophorus, L. (v. Mule-weed, White-head-broom). 



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



440. Ambrosia artemisiaefolia, L. /?) trinitensis. 



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



441. Zinnia multiflora, L. (v. Snake-flower). 



Fl. Feb.-Aug. Along roads, not uncommon. Virgin Islands. 



442. Z. elegans, Jacq. 



Fl. May-Oct. Naturalizeel in gardens. All islands. 



443. Eclipta alba, Hassk. 



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



