STANDLEY TREES AND SHRUBS OF MEXICO. 1199 



Leaves pinnately lobed or deeply palmate-lobed, but not divided to the petiole. 



Corolla yellovp; capsule 3 to 4 cm. in diameter 9. O. tuberosa. 



Corolla white or whitish ; capsule 1 to 2 cm. in diameter. 



Plants hirsute 10. O. dissecta. 



Plants glabrous. 

 Leaves deeply lobed, the lobes extending nearly to the costa. 



11. O. omithopoda. 

 Leaves lobed less than halfway to the costa 12. O. pectinata. 



1. Operculina alatipes (Hook.) House, Bull. Torrey Club 33: 499. 1906. 

 Ipomoea alatipes Hook, in Curtis's Bot. Mag. pi. 5330. 1862. 



Ipomoea alata Rose, Contr. U. S. Nat. Herb. 1: 108. 1891. Not /. alata R. 

 Br. 1810. 



Operculina ruiicunda House, Bull. Torrey Club 33: 498. 1906. 



Sonora to Chiapas. Central America and Colombia. 



Plants glabrous, chiefly herbaceous ; leaves lanceolate to broadly ovate- 

 cordate, 3 to 8 cm. long, acuminate; sepals about 2.5 cm. long; corolla red, 

 the tube 4 to 5 cm. long ; seeds black, glabrous. "Mechoacan," " campanula," 

 "quiebra cajete" (El Salvador). 



2. Operculina lancifolia House, Muhlenbergia 5: 68. 1909. 



Type from Valley of Jiquipilas, Chiapas, altitude 660 to 840 meters. 



Plants glabrous, herbaceous; leaves 5 to 7 cm. long, 4 to S mm. wide, 

 sagittate-cordate at base ; peduncles l-flowered ; sepals about 2 cm. long ; corolla 

 pink, 5 cm. long. 



3. Operculina rhodocalsrx (A. Gray) House, Bull. Torrey Club 33: 498. 1906. 

 Ipomoea rhodocalyx A. Gray, Proc. Amer. Acad. 22: 439. 1887. 



Sinaloa and Jalisco ; type from Tequila, Jalisco. 



Plants glabrous ; leaves ovate-cordate, 5 to 10 cm. long, acuminate ; peduncles 

 1 or 2-flowered ; calyx reddish ; corolla yellow, 5 to 6 cm. long ; seeds glabrous. 



4. Operculina discoidesperma (Donn. Smith) House, Muhlenbergia 5: 68. 1909. 

 Ipomoea discoidesperma Donn. Smith, Bot. Gaz. 14: 27. 1889. 



Coahuila to Guanajuato and Chiapas. Guatemala ; type from Pansamaia. 



Plants glabrous; leaves rounded-cordate, 6 to 15 cm. long, acuminate; pedun- 

 cles 2 or 3-flowered ; corolla yellow, about 5 cm. long ; capsule about 2.5 cm. in 

 diameter, 1-seeded, the seed compressed, 1 cm. broad, densely pubescent. 



5. Operculina aegyptia (L.) House, Bull. Torrey Club 33: 502. 1906. 

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



Convolvulus pentaphyllus L. Sp. PI. ed. 2. 233. 1763. 



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



Ipomoea sinaloensis T. S. Brandeg. Zoe 5 : 217. 1905. 



Merremia aegyptia Urban, Symb. Antill. 4: 505. 1910. 



Sinaloa to Chiapas and Yucatan. Widely distributed in the tropics of both 

 hemispheres. 



Stems chiefly herbaceous ; leaflets 5, elliptic or obovate, 4 to 10 cm. long, 

 acuminate; calyx densely hirsute; corolla white, about 2.5 cm. long; seeds 

 glabrous. 



6. Operculina aurea (Kellogg) House, Muhlenbergia 5: 68. 1909. 

 Aniseia aurea Kellogg, Proc. Calif. Acad. 5 : 83. 1873. 



Ipomoea aurea Kellogg; Curran, Bull. Calif. Acad. 1: 143. 18S5. 

 Baja California. 



