192 ANNALS NEW YORK ACADEMY OF SCIENCES 



Section II. PHARBITIS. 



Annual or perennial twining or trailing vines with herbaceous sepals, 

 these often with elongated tips and more or less pubescent or hispid bases; 

 capsules globose, thin-walled, 2-, 3- or 5-celled. 



Nil Medicus in Staatw. Vorles. Churpf. Phys-Oak. Ges. 1: 210. 1791. 

 Convolvuloides Moench, Meth. 451. 1794. 

 Ornithosperma Raf. Fl. Ludov. 149. 1817. 

 Cleiemera Raf. Fl. Tellur. 4: 77. 1838. 



Pharbitis Choisy, in Mem. Soc. Phys. Genev. 6: 438. 1833.— In DC. Prodr. 9: 341. 

 1845. 



4. Cephalanthse. Stout, annual or perennial twiners; the inflor- 

 escence congested or capitate and subtended by herbaceous, usually pubes- 

 cent or hairy bracts, or the pedicels very short and each subtended by a 

 bract. {I'pomcBa, Sect. Strophipomoea § Ceplialanthas Choisy, in DC. Prodr. 

 9:363. 1845.) 



Sepals and bracts similar, hairy, not veined. 



Stems minutely or softly pubescent or tomentose. 



Leaf-blades silvery beneath; stems tomentose. 20. /. maireti. 



Leaf-blades not silvery beneath, glabrous above and stems 



minutely pubescent. 21. /. invicta. 



Stems retrorsely strigose-pubescent. 

 Corolla 7-9 cm. long; western Mexico. 

 Corolla 3-4 cm. long; southern Mexico. 

 Sepals and bracts dissimilar; sepals veined. 



Stems hirsute; peduncles longer than the pedicels. 

 Stems glabrous; peduncles very short and usuaUy shorter 

 than the pedicels. 



20. Ipomcea maireti Choisy, in DC. Prodr. 9 : 374. 1845. 



A stout, perennial vine, with densely tomentose stems; leaf-blades ovate, cor- 

 date, 7-12 cm. long, acute, finely pubescent above, den.sely silvery pubescent beneath; 

 peduncles 1-3-flowered; bracts ovate, obtuse; sepals 18-22 mm. long, oblong-lance- 

 olate, acute; corolla campanulate-fumielform, 7-8 cm. long, the limb blue, the tube 

 white below, pubescent without. 



Type locality: Mexico. 



Distribution: Forests from Orizaba region to Oaxaca and Guatemala. 



Specimens examined: Zuzuapan, Purpus 2S91, 1907 (Y). Valley 

 of Cordova, Borgeau 1738, 1866 (G). Oaxaca, E. W. Nehon 2JfiO & 24-71, 

 1895; Conzatti & Gonzalez 620, 1897 (G). Orizaba, A. Gray, 1885 (G). 

 Guatemala, Sutton Hayes, 1860 (G). 



