1889.] NATURAL SCIENCES OF PHILADELPHIA. d93 



Order LXII. GENTIANEAE. 



1. Eustoma exaltatum. Cr. 

 West Indies and America. 



2. Sabbatia gracilis, Salisb. (Herrick.) 



Joe's Cay, off Little Abaco. A delicate jplaDt which has large 

 rose-colored flowers. This order has tonic and febrifugal properties 

 from the hitter principle which is present in its members. 



Order LXIII. HYDROLEACEAE. 



1. Nama Jamaicensis, L. 



West Indies and America. No use is known. 



Order LXIV. CONVOLVULACAAE. 



1. Ipomoea Batatas. Lam. 



Sweet Potato. Naturalized from South America. 



2. I. sidifolia. Chois. 



Christ m as- Mower. West Indies. 



3. I. Pes-capri, Sw. 



Sea-side Potatoe. West Indies and all tropical countries. 



4. I. coccinea, L. 



West Indies and America. 



5. I. purpurea. Lam. 



United States. West Indies and America. 



6. I. Bona-nox, L. [Do/Icy.) 



Moon-flower. Native of India ; pure white flowers, 5-6 inches in 

 diameter, opening at night and giving out a delicate perfume. 



7. I. arenaria. Steud. (Swait 



8. I. Carolina, L. (Catesb.) 



On rocks. 



9. I. cathartica, Poir. (Swains.) 



Morning-glory. West Indies and S. America. 



10. Convolvulus micranthus, R. S. 

 West Indies and South America. 



11. C. Jamaicensis, Jacq. (Swains.) 

 Indigenous and West Indies. 



12. Evolvulus arbuscula, Loir. (Swains.) 



Indigenous and W. Indies. The plants of this order possess in 

 their rhizomes a highly purgative principle, Jalap ; except I. Bata- 



