502 House : North American Convolvulaceae 



olla-limb somewhat broader than 0. Rose ana, 4-5 cm. broad, the 

 margin subentire, the plicae hirsute without with black hairs. 



San Luis Potosi : San Dieguito, Dr. Edward Palmer 112, 



June 13-16, 1904; type in the National Herbarium. 



13. Operculina Palmeri (S. Wats.) 



Ipomoca Palmeri S. Wats. Proc. Am. Acad. 24: 63. 1889. 



Type locality : Guaymas, Sonora [Mexico], Dr. Edivard Pal- 

 mer 75, 1887 (type). 



Distribution : Stream beds and ravines, Sonora, Mexico. 



14. Operculina platyphylla (Fernald) 



Ipomoca Palmeri platyphylla Fernald, Proc. Am. Acad. 33 : 90. 



1897. 



Resembling O. Palmeri, but the stems smoother, leaflets 

 broader, more obtuse at the ends ; peduncles often many-flowered ; 

 corolla longer than in O. Palmeri. 



Type locality: Acapulco, Guerrero [Mexico], Dr. Edivard 

 Palmer 415, 1894-95 (type). 



15. Operculina aegyptia (L.) 



Ipomoea aegyptia L. Sp. PI. 162. 1753. 

 Convolvulus pentaphyllus L. Sp. PI. ed. 2. 233. 

 Ipomoea pentaphylla Jacq. Coll. 2: 297. 1788. 



1762. 



ip 



1 1. 1797. Not I. pil 



nemorosus W 



303. 1819. 



Spiranthera pentaphylla Bojer, Hort. Maurit. 226. ^1837. 

 Batatas pentaphyllus Choisy, Conv. Or. 54. 1834. — In DC 



Prodr. 9 : 339. 1845. 



Type locality : Tropical America. 



Distribution : West Indies ; central and southern Mexico tc 

 Brazil and Peru. Tropics of the old world. 



Illustrations : Herm. Lugdb. pi. 185. — Jacq. Coll. 2 : pi. jip 

 Wight, 111. Ind. Bot. pi. 7. — Cav. Ic. 4: //. j2j. —Wight 



pi, 



The commonly accepted name for this species, Ipomoea penta- 

 phylla (L.) Jacq., is plainly antedated by the Linnaean name /. 

 aegyptia. Linnaeus did here what he frequently did in the case 



