A foundation monograph of Ipomoea (Convolvulaceae) in the New World Author Wood, John R. I. Author Munoz-Rodriguez, Pablo Author Williams, Bethany R. M. Author Scotland, Robert W. text PhytoKeys 2020 143 1 823 http://dx.doi.org/10.3897/phytokeys.143.32821 journal article http://dx.doi.org/10.3897/phytokeys.143.32821 1314-2003-143-1 F6F11A6EE4FF5A1885CEA2B60AE965A5 256. Ipomoea cardiophylla A. Gray , Syn. Fl. N. Amer., ed. 2, 2: 213. 1886. (Gray 1886: 213) Type. UNITED STATES. Texas, near El Paso, C. Wright 511 (holotype GH, isotype K). Description. Twining annual herb, stems glabrous. Leaves petiolate, 2-6 x 1.3-3.8 cm, ovate, cordate with rounded auricles, narrowed to an obtuse, mucronate apex, margin entire, both surfaces glabrous and green; petioles 1.5-6.5 cm. Inflorescence of 1-5-flowered, axillary cymes; peduncles 1-3 mm on new shoots, up to 8 cm on older shoots, stout; bracteoles caducous; pedicels 12-14 mm, becoming reflexed in fruit; sepals subequal, 4-6 x 2-4 mm, ovate-deltoid, very acute, glabrous, margins scarious, white; corolla 2.5-2.7 cm long, funnel-shaped, blue drying pink with pale tube, glabrous, limb 3-3.5 cm diam. Capsules very large, ovoid, 10-12 x 8-12 mm, rostrate, glabrous; seeds 5-6 x 3 mm, shortly and finely puberulent. Distribution. In semi-desert in the United States southwest and northern and central Mexico. MEXICO. Chihuahua : C.G. Pringle 617 (BM, K, P). Coahuila, 25 miles SW of Monclava, E. Palmer 904 (K, P); near Rancho Cerro de la Madera, T. Wendt 1780 (ASU). Durango : Mapimi , A. Herrera 1 (IEB). Guanajuato : Xichu , S. Zamudio & J. Becerra 11623 (IEB); ibid., Ca. De Huamuchil, J. Rzedowski 52929 (IEB). Hidalgo : Tecozautla, S. Rojas 378 (IEB). Michoacan : Cuitzeo, E. Carranza & I. Silva 7255 (IEB). Nuevo Leon : G.B. Hinton 21674 (GBH). Oaxaca : V. Gonzalez & G. Conzatti 898 (GH). Queretaro : Salida a San Luis de Potosi , E. Argueelles 276 (MEXU, NY); Mun. Corregiodora, L. Hernandez 6536 (IEB). San Luis de Potosi : Villa Juarez , S. Zamudio 3817 (IEB). Sonora : Sierra Anibacachi , SW of Agua Prieta, T.R. Van Devender et al. 2004-117 (ARIZ). Tamaulipas : San Nicholas , M. Martinez 5057 (IEB). Veracruz : Zacuapan, C.A. Purpus 4320 (BM, F, GH, US). UNITED STATES. Arizona : Cochise Co., Tombstone, D.F. & S. Austin 7608 (ASU); S. Walker s.n. (UTC); Santa Cruz, W. Hodgson 3913 (DES). New Mexico : Grant, Silver City, A.D. Zimmerman 2006 (DES). Texas : Trans Pecos Mountains region fide Correll and Johnston (1970). Notes. Very similar to Ipomoea marginisepala in all characteristics and difficult to separate except geographically, although molecular studies suggest the two species are distinct. In the type only, the peduncles are suppressed. This species is often confused with and sometimes treated as a synonym of Ipomoea aristolochiifolia (Austin 1982a: 38) but is readily distinguished by the lanceolate to ovate, acute unwarted sepals and by the peduncle which does not pass through the leaf sinus.