PLANTS OF COZUMEL ISLAND. 108 



and the plant doubtingly referred to Alomia ageratoides apparently differs from the 

 present only in having white flowers and epappose achenes. 



[ii. p. 79.] Alomia ageratoides, H. B. K. ? 



[ii. p. 123.] Erigeron canadensis, Linn. W. 



[ii. p. 133.] Pluchea purpnrascens, DC. W. 



[ii. p. 145.] ICelampodium divaricatum, DC 



Ambrosia hispida, Pursh, Fl. Am. Sept. ii. p. 743 ; A. Gr. Synopt. Fl. N. Am. 

 i. 2, p. 250; Chapm. Fl. Southern U.S. p. 223. 



Ambrosia crithmifolia, DC. Prodr. v. p. 525 ; Griseb. Fl. Brit. West Ind. p. 370. 

 Sea-shore, very abundant. — Floeida ; Bahamas ; Tuek Island ; Cuba. 



[ii. p. 148.] Parthenium hysterophorus, Linn. W. 

 [ii. p. 183.] Melananthera hastata, Michx. w. 

 [ii. p. 170.] Wedelia carnosa, Eich. w. 



Borrichia arboreSCens, DC. Prodr. v. p. 489 ; Chapm. Fl. Southern U.S. p. 224 ; 

 Griseb. Fl. Brit. West Ind. p. 371 ; Hemsl. in Bot. Chall. Exped. i. 1, p. 44, t. 2. 



Bushy, about 3 feet; abundant on sea-shore. — Beemudas and South Floeida to 

 Guadaloupe, Jamaica, Cuba, and Peeu. 



Spilanthes repens, Michx. Fl. Bor.-Am. ii. p. 131 ; A. Gr. Synopt. Fl. N. Am. 

 i. 2, p. 258, var. % 



Spilanthes nuttallii, Torr. et A. Gr. Fl. N. Am. ii. p. 356. 



Marshy places ; not abundant. — Gray gives the range of the species, as extended by 

 him, from South Carolina to Floeida, Aekansas, and Texas. 



[ii. p. 203.] Bidens pilosa, Linn. W. 



[ii. p. 208.] Tridax procumbens, Linn. w. 



[ii. p. 216.] Plaveria linearis, Lag. w. 



CAMPANULACEJE. 



Isotoma longiflora, Presl, Prodr. Lob. p. 42 ; DC. Prodr. vii. p. 413 ; Griseb. 

 Fl. Brit. West Ind. p. 388. 



Not common. — Throughout the West Indies ; and there is also a specimen in the 

 Kew Herbarium from Guatemala, which was overlooked before. 



