1196 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Sepals acute or acuminate, or at least apiculate. 



Sepals glabrous 7. J. oaxacana. 



Sepals variously pubescent. 



Inflorescence glandular-pilose 8. J. azurea. 



Inflorescence without glandular pubescence. 

 Cymes many-flowered, usually dense. 



Sepals very densely pubescent. Leaves densely pubescent on both 



surfaces 9. J. abutiloides. 



Sepals sparsely pubescent or glabrate. 



Leaves acute or acuminate, glabrate 10. J. pentantha. 



Leaves rounded at apex and mucronate or cuspidate, densely 



pubescent beneath 11. J. apiculata. 



Cymes mostly 3 or 4-flowered. 



Sepals all of equal length 12. J. palmeri. 



Sepals unequal, the outer ones slightly longer. 

 Sepals densely pilosulous. Leaves mostly obtuse, densely pubes- 

 cent 9. J. abutiloides. 



Sepals sparsely pubescent or glabrate, or minutely tomentulose. 

 Leaves acute to acuminate, the upper ones slender-petiolate. 



13. J. pringlei. 



Leaves obtuse or rounded at apex and mucronate, the upper 



ones usually subsessile 14. J. smithii. 



1. Jacquemontia tamnifolia (L.) Griseb. Fl. Brit. W. Ind. 474. 1861. 

 Ipomoea tamnifolia L. Sp. PI. 162. 1753. 



Jacquemontia macrocepliaJa T. S. Brandeg. Zoe 5: 219. 1905. 



Thyclla macrocephala House, Muhlenbergia 5: 68. 1909. 



Sinaloa. Southern United States, West Indies, South America, and tropi- 

 cal Africa. 



Stems herbaceous, pilose; leaves ovate or ovate-cordate, slender-petiolate, 

 acuminate; flower heads long-pedunculate, many-flowe»ed, hirsute; corolla 

 blue, about 12 mm. long. 



2. Jacquemontia pycnocephala Benth. Bot. Voy. Sulph. 137. 1844. 

 Thyella pycnocephala House, Bull. Torrey Club 33: 314. 1906. 

 Guerrero, the type from Acapulco. 



Stems densely fulvous-pilose; leaves long-petiolate, broadly ovate-cordate, 

 2.5 to 5 cm. long, cuspidate-mucronate, densely pubescent ; heads on long or 

 short peduncles, the bracts rounded-ovate or deltoid-ovate; corolla about 1.5 

 cm. long, blue. 



3. Jacquemontia perryana Duchass. & Walp. Linnaea 23: 751. 1850. 

 Ipomoea lactescens Seem. Bot. Voy. Herald 171. 1854. 



Oaxaca. Panama ; type collected near the city of Panama. 



Stems chiefly or wholly herbaceous, hirsute or glabrate ; leaves long-petiolate, 

 broadly ovate-cordate, 4.5 to 8 cm. long, acuminate; heads long-pedunculate, 

 very dense, hirsute ; corolla white, about 3.5 cm. long. 



4. Jacquemontia nodiflora (Desr.) Don, Hist. Dichl. PI. 4: 283. 1838. 

 Convolvulus nodiflorus Desr. in Lam. Encyl. 3: 557. 1789. 



Sinaloa to Oaxaca and Veracruz. West Indies; Central and South America. 



Stems often suffrutescent, tomentose; leaves short-petiolate, oblong-lanceo- 

 late to broadly ovate-cordate, 3 to 5.5 cm. long, acute or acuminate, densely 

 tomentose beneath ; cymes many-flowered, short-pedunculate ; corolla white, 

 about 12 mm. long. 



