Ipomoea heterodoxa Standl. & Steyerm.

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

178. Ipomoea heterodoxa Standl. & Steyerm. , Publ. Field Mus. Nat. Hist., Bot. Ser. 23: 82. 1944. (Standley and Steyermark 1944: 82)

Type.

BELIZE. Maskall, P. Gentle 871 (holotype F0054844, isotype S).

Description.

Twining perennial or small liana to c. 4 m, stems glabrous, somewhat woody. Leaves petiolate, palmately divided into 5-7 lobes, the lateral 4 lobes sessile to shortly petiolate, the terminal lobe pedately trilobed, lobes 2-7 × 0.5-1.8 cm, oblong-oblanceolate, obtuse to subacute, glabrous, abaxially paler; petioles 3-5 cm. Inflorescence of shortly pedunculate, cluster-like cymes, the cymes often paired; peduncles 0-12 mm; secondary peduncles 2-4 mm; bracteoles early caducous, not seen; pedicels 6-9 mm; sepals subequal, rigid and somewhat convex, glabrous, the margins scarious, outer 4-5 × 4 mm, obovate-elliptic, obtuse, inner sepals 5 × 5 mm, rounded to retuse; corolla 3-3.5 cm, funnel-shaped, white with pink-flushed limb, glabrous, gradually widened from base, tube whitish-green; limb c. 2 cm diam. Capsules 7 × 4-5 mm, ovoid, rostrate, glabrous, the mucro 2-3 mm long; seeds 5-7 mm long, pilose with white marginal hairs.

Illustration.

Figure 7D .

Distribution.

Endemic to Central America in dry forest at very low altitudes.

GUATEMALA. Petén, P.N. Tikal, R. Tun Ortíz 364; ibid., 440 (BM, MO); ibid., E. Contreras 367 (F, MO, XAL); Lago Petén Itzá, B. Wallnöfer 9506 (K, MO, W).

BELIZE. Stann Creek, G.R. Proctor 35804 (BM); ibid., W.A. Schipp 846 (BM, K, S); Cayo, Chaa Creek Trails, M.J. Balick et al. 3171 (NY, OXF).

MEXICO. Campeche: Calakmul, Puente El Papagayo, E. Martínez et al. 31814 (BM, MEXU); ibid., Narciso Mendoza, D. Álvarez 544 (BM, MEXU). Chiapas: Ocosingo, E. Martínez 15974 (MO). Quintana Roo: Laguna Ocum, E. Cabrera 293 (BM, MEXU): Felipe Carillo Puerto, E.F. Cabrera & L. Cortez 396 (BM, MEXU). Tabasco: Balancan, A. Novelo et al. 115 (K, MEXU). Yucatán: Mérida, A. Schott 589 (BM); Izamal, G.F. Gaumer 989 (BM, K, S); Valadolid, Xuilub, B. Morgensen 1182 (AAU, K, MO).

Note.

The palmately lobed leaves and shortly pedunculate cymes distinguish this species. The distribution in Fl. Mesoamericana 4(2): 332 is completely wrong.

Figures

Figure 7. Sepals of Ipomoea species. A I. meyeri B I. ternifolia C I. cryptica D I. heterodoxa E I. sericosepala F I. splendor-sylvae G I. squamisepala H I. trifida. Photographs of A (Anderson 1895) B (Pringle 4439) C (Soto et al. 1331) E (Wood & Soto 27550) F (Wilkin 472) and H (Smith 1570) by John Baker; D (Wallnoefer 9506) by John Wood; G (Mendoza 4902) by Moises Mendoza.