Ipomoea costellata Torr.

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

328. Ipomoea costellata Torr. , Bot. Mex. Bound. 149. 1859. (Torrey 1859: 149)

Convolvulus digitatus Sesse & Moc. , Pl. Nov. Hisp. 24. 1888. ( Sessé y Lacasta and Moçiño 1887-90: 24). Type. MEXICO. Sessé & Moçino 887 (holotype MA00603823).

Convolvulus pedatus Sesse & Moc. , Pl. Nov. Hisp. 24. 1888. ( Sessé y Lacasta and Moçiño 1887-90: 24), nom. illeg., non Convolvulus pedatus Roxburgh (1824) . Type. MEXICO. Sessé & Moçiño 107 (lectotype MA606866, designated here).

Ipomoea painteri House , Muhlenbergia 3: 41. 1907. (House 1907a: 41). Type. MEXICO. Dist. Fed., near Guadelupe, J.N. Rose & Painter 6825 (holotype US US00390631).

Ipomoea pusilla Brandegee , Univ. Cal. Publ. Bot. 4: 382. 1913. (Brandegee 1913: 382). Type. MEXICO. Veracruz, C.A. Purpus 6152 (holotype UC149878, isotypes GH, F, P, US).

Ipomoea futilis A. Nelson, Univ. Wyoming Publ. Sci. Bot, 1(3): 65. 1924. (Nelson, A 1924: 65). Type. UNITED STATES. Arizona, Hanson 1016 (holotype RM0002262).

Ipomoea costellata var. edwardsensis O'Kennon & G.L. Nesom , Sida 20: 39. 2002. ( O’Kennon and Nesom 2002: 39). Type. UNITED STATES. Texas, Travis County, B.C. Tharp s.n. (holotype TEX00026687).

Type.

UNITED STATES. Texas, C. Wright 505 (lectotype GH00054454, designated by House (1908b: 234), isolectotypes BM, F, GH, K, MO, NY, US).

Description.

Slender annual herb, usually branched at base with decumbent or ascending branches, glabrous or with a few scattered hairs; stems to 2 m long but usually much less. Leaves petiolate, small, 0.7-2.5 × 2-3 cm, variably palmatisect with 5-7 separate leaflets, the laterals pedate, leaflets 1-2.7 × 0.1-0.2 cm, linear-oblong, apiculate, glabrous or with a few scattered hairs; petioles 0.2-3 cm. Flowers solitary (rarely paired), axillary, pedunculate; peduncles slender, 1.8- 5 cm, straight; bracteoles 1-2 × 0.25 mm, filiform, scarious-margined; pedicels 7-25 mm; sepals subequal, lanceolate to ovate, acute, mucronate, the mucro c. 1 mm long, glabrous or nearly so, margins scarious, outer 3-5 × 1-2 mm, often muricate along prominent midrib, inner up to 6 × 3 mm; corolla 1-1.2 cm long, funnel-shaped, purplish, glabrous. Capsules 4-5 × 4 mm, globose to ovoid, glabrous, the slender style somewhat persistent; seeds 3-3.5 × 2 mm, black, minutely tomentellous.

Illustration.

Figure 141D , 157 .

Distribution.

Dry scrub and deserts, principally in the United States Southwest and Mexico but of unknown status in Guatemala and apparently naturalised in Venezuela. It is found from low altitudes up to at least 2300 m.

VENEZUELA. Dist. Fed.: H. Pittier 15137 (VEN) n.v.

GUATEMALA. J. Steyermark 29498 (F), 50738 (F, US).

MEXICO. Aguascalientes: Calvillo, M.C. Provance et al. 1436 (UCR). Baja California Sur: Sierra de La Giganta, Puerto Escondido, A.M. Carter & R. Moran 5536 (MO); ibid., Mesa de San Gerónimo, A. Carter 5019 (BM, UC). Chiapas: Tuxtla Gutiérrez, D.E. Breedlove 13875 (F); Mun. Comitan, A.R. Garcia 1101 (BM). Chihuahua: Sawakoa, Río Mayo, H.S. Gentry 2456 (K, S); Seven Star Mine, C.H.T. Townsend & C.M. Barber 383 (BM, K, MO, P). Coahuila: E. Palmer 2095 (K); Ramos Arispe, Sierra de la Paila, J.A. Villarreal 4690 (ASU). Durango: E. Palmer 649 (BM, E, K, MO); Nombre de Dios, R. Jiménez & S. Acevedo 111 (IEB). Est. México & Dist. Fed.: J. Rzedowski 37551 (IEB). Guanajuato: Romita, San Francisco de Gavia, J. Rezedowski 52424 (IEB). Hidalgo: Alfajayucan, R. Hernández 6482 (MO). Jalisco: Guadalajara, C.R. Barnes & W.J.G. Land 124 (K). Michoacán: Morelia, G. Cornejo Tenorio 2350 (IEB). Morelos: Cuernavaca, Berlandier 974 (BM). Oaxaca: Cerro Juárez, C. Conzatti 1957 (MO); Cañon de Tomellin, C. Conzatti 2055 (K). Puebla: Coxcatlán, C.A. Purpus 4215 (BM, MO). Querétaro: Ezequiel Montes, Las Rosas, J. Rzedowski 53658 (IEB); 3 km W de Las Rosas, E. Argüelles 2664 (IEB). San Luis de Potosí: fide McDonald (1995). Sinaloa: La Noria, Y. Mexia 3601/2 (MO). Sonora: Cajón de los Guerrijos, Lumholtz 430 (K); Sahuipa, T.R. Van Devender et al. 2009-800 (ARIZ), El Guayabo, T.R. Van Devender et al. 93-1230 (ASU), Mesa Mesiaca, T.R. Van Devender et al. 62-1124 (ARIZ, ASU). Tamaulipas: Ciudad Victoria-Jaumave, V.W. Steinmann et al. 3707 (IEB). Veracruz: Baños de Carrizal, C.A. Purpus 6152 (BM, CAS, F, GH, MO, US). Yucatán: Ruinas de Xtampú, J.L. Tapia & G. Carnevali 1120 (ASU). Zacatecas: San Juan Capistrano, J.N. Rose 2434 (K, US).

UNITED STATES. Arizona: Parker 8421 (S); Patagonia Mts., T.H. Kearney & R.H. Peebles 10143 (K, US); Pima Co., McManus & McLaughlin 439 (ARIZ); Gila Co., J. Ward 881 (DES); Chiricahua Mts, J.C. Blumer 1663 (K). New Mexico: Florida Mts., A.I. Mulford 1111 (K); Mogollon Mts., O.B. Metcalfe 766 (BM, K); Apache Pass, Chiricahua, J.G. Lemmon 442 (BM); Organ Mts., E.O. Wooton 625 (K). Texas: Franklin Mountains, R.D. Worthington 17077 (L); Presidio Co., W.R. Carr 31818 (NY).

Typification.

In selecting a lectotype for Convolvulus pedatus we have chosen MA606866 in preference to MA603824 (cited by Nelson, 1997; 393) because it has Sessé and Moçiño’s original manuscript notes attached and these correspond to the protologue in Flora Mexicana.

Note.

Var. edwardensis differs in the short peduncle (<2.2 cm) and pure white corolla with ovate, apiculate (not rounded) lobes.

Figures

Figure 141. Photographs of Ipomoea species A I. plummerae, form with entire leaves B I. plummerae, form with lobed leaves C I. longeramosa D I. costellata E I. amnicola F I. paludicola G I. chondrosepala. A, B Mario Giorgetti C Rosemary Clegg D Firefly Forest E-G Maira Martinez.

Figure 157. Ipomoea costellata A habit B outer sepal C inner sepal D corolla opened out to show stamens E ovary and style F fruiting inflorescence G capsule H seeds. Drawn by Rosemary Wise A from Wooton 625; B-E from Kearney & Peebles 10143; F-H from Palmer 649.