1178 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Roulinia sinaloensis T. S. Brandeg. Zoe 5: 243. 1908. 



Roulinia ligulata Pittier, Contr. U. S. Nat. Herb. 13: 111. 1910. 



Sinaloa to Michoacan ; type from Aguascalientes. 



Slender vine, chiefly herbaceous, the stems glabrous or nearly so; leaves 

 long-pet iolate, ovate-cordate, 5 to 8.5 cm. long, acuminate, deeply cordate at 

 base, thin, puberulent beneath along the nerves ; cymes raceme-like or umbel- 

 like, fevr-flowered ; calyx lobes linear ; corolla campanulate, 12 to 15 mm. 

 long, purple, glabrous outside, pubescent within, the lobes lance-linear, re- 

 curved above ; corona simple, . tubular, the lobes ovate, caudate-attenuate, 

 nearly equaling the corolla. 



12. OXYPETALXJM R. Br. Mem. Wern. Soc. 1: 41. 1809. 



1. Oxypetalum cordifolium (Vent.) Schlechter in Urban, Symb. Ant. 1: 269. 

 1899. 



GotJiofreda cordifolia Vent. Choix PI. Gels. 7. pi. 60. 1803. 



Oxypetalum riparinin H. B. K. Nov. Gen. & Sp. 3: 197. 1819. 



San Luis Potosi, Veracruz, and Oaxaca. West Indies ; Central and South 

 America. 



Plants scandent, herbaceous or suffrutescent ; leaves long-petiolate, ovate- 

 cordate, 6 to 10 cm. long, acuminate, deeply cordate at base, pubescent ; cymes 

 few-flowered, pedunculate, shorter than the leaves, the pedicels filiform ; calyx 

 lobes linear-lanceolate ; corolla lobes narrowly linear, about 2 cm. long, pu- 

 berulent ; corona lobes oblong-ligulate, truncate. 



13. ROTJLIiniEI/LA Vail, Bull. Torrey Club 29: 6G2. 1902. 



Refb2Jence: Vail, Bull. Torrey Club 29: 662-668. 1902. 



Plants scandent, herbaceous or fruticose, glabrous or puberulent ; leaves 

 cordate, long-petiolate, thin ; cymes racdmiform, the flowers whitish or green- 

 ish ; calyx 5-parted, glandular within ; corolla subrotate, the lobes contorted 

 or subvalvate; corona scales connected by a membranceous ring, erect, acumi- 

 nate or caudate; follicles smooth. 



Corona scales not exceeding the stigma 1. K. unifaria. 



Corona scales much exceeding the stigma. 



Buds globose 2. R. palmeri. 



Buds ovoid, pointed. 



Corona scales gradually narrowed into the terminal ligule__3. R. lignosa. 

 Corona scales abruptly contracted into the terminal ligule.__4. R. foetida. 



1. Rouliniella unifaria (Scheele) Vail, Bull. Torrey Glub 29: 663. 1902. 

 Oonolobus unifarius Scheele, Linnaea 21: 760. 1848. 



Roulinia unifaria Engelm. ; Torr. U. S. & Mex. Bound. Bot. 160. 1850. 



Cmanchiwi racenwsum T. S. Brandeg. Univ. Calif. Publ. Bot. 7: 331. 1920. 



Nuevo Le6n, Tamaulipas, and Veracruz. Western Texas; type from New 

 Braunfels. 



Stems slender, chiefly herbaceous, glabrous or nearly so; leaves deltoid to 

 broadly ovate-cordate, 2.5 to 7 cm. long, acuminate, usually deeply cordate 

 at base, glabrous; inflorescence equaling or exceeding the leaves, 7 to 12- 

 flowered ; buds globose ; corolla white, 4 to 6 mm. long ; corona scales obscurely 

 8-lobate; follicles 6 cm. long. " Talayote " (Tamaulipas). 



2. Rouliniella palmeri (S. Wats.) Vail, Bull. Torrey Club 29: 664. 1902. 

 Roulinia palmeri S. Wats. Proc. Amer. Acad. 18: 115. 1883. 

 Coahuila ; type from mountains northeast of Monclova. 



