Ipomoea temascaltepecensis P. Wilkin

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

249. Ipomoea temascaltepecensis P. Wilkin , Kew Bull. 50 (1): 95. 1995. (Wilkin 1995: 95)

Type.

MEXICO. Est. México, Temascaltepec district, G.B. Hinton et al. 5316 (holotype K000612716, isotype GH).

Description.

Liana resembling Ipomoea ampullacea in habit, white latex and thinly retrose pilose indumentum. Leaves petiolate, 6.5-16 × 6-18 cm, broadly ovate, shortly acuminate, cordate (sometimes very shallowly 3-lobed), occasionally with marginal teeth, adaxially sparsely adpressed hispid-pilose, abaxially paler, more densely hirsute; petioles 4.5-8 cm, thinly pilose. Inflorescence of long-pedunculate, few-flowered axillary cymes; peduncles 7-28 cm, pubescent; bracteoles resembling small leaves, caducous; pedicels 5-22 mm, puberulent; sepals somewhat unequal, pubescent, outer 15-28 × 7-12 mm, ovate and gradually tapered to an acuminate apex, inner similar but lanceolate and 2-4 mm shorter; corolla 4.5-8 cm long, funnel-shaped, pink, pubescent; stamens included; stigma 3-lobed. Capsules globose. 10-15 mm, glabrous, shortly rostrate; seeds up to 6, 5.5-6 mm long, whitish-puberulent.

Illustration.

Figure 130 .

Distribution.

Endemic to the Temascaltepec region of Mexico State at around 1200 m.

MEXICO. Est. México: Temascaltepec, G.B. Hinton et al. 8258 (F, K, MO); ibid., Yperricones, G.B. Hinton et al. 341 (K); ibid., Pungarancho, G.B. Hinton et al. 4786 (K, BM, GH); ibid., Platanal, G.B. Hinton et al. 8590 (K, GH); ibid., Rincón del Carmen, G.B. Hinton et al. 8610 (K, GH).

Notes.

Essentially a locally evolved species related to Ipomoea ampullacea but with pink flowers adapted for insect pollination.

There is an unexpected record from Sonora (T.R. Van Devender & A.L. Reina-G. 99-548 (MO), which we have not seen.

Figures

Figure 130. Ipomoea temascaltepecensis. A habit B abaxial leaf surface C outer sepal D inner sepal. Drawn by Rosemary Wise from Hinton 2928.