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 330. Ipomoea ramulosa J.R.I. Wood & Scotland, sp. nov urn:lsid:ipni.org:names: Type. MEXICO. Guerrero. Agua de Obispo, 745 m, 31 Dec. 1965 , Kruse 964 (Holotype MEXU74987). Diagnosis . Probably related to Ipomoea costellata and its allies because of its lobed leaves and aristate sepals but very distinct because of the winged stem, deeply 3-lobed leaves, the much-branched, almost paniculate inflorescence, the white corolla with stamens held at the corolla mouth. Description. Completely glabrous climbing perennial; stems 5-6 m long, stout, slightly winged, reddish Brown. Leaves petiolate, 3.5-7 x 5-10 cm, 3-lobed, the central lobe broadly to narrowly oblong-elliptic, narrowed at both ends, acuminate, mucronate, the mucro 2 mm long, lateral lobes shallowly lobed or, near base, bilobed, the upper lobe forward-pointing, the lower lobe spreading, base broadly cordate, margin entire, abaxially paler; petioles 4-5.5 cm. Inflorescence of lax, compound, long-pedunculate, axillary cymes; peduncles 11-14 cm; bracteoles 1 mm, deltoid; secondary and subsequent peduncles 3-4.5 cm; pedicels 1-2.3 cm; sepals unequal, oblong-elliptic, terminating in a fine aristate point, the arista 2-3 mm long; outer 13-15 x 6 mm, the inner slightly longer and broader with broad scarious margins; corolla 6-6.5 cm long, funnel-shaped, white with tube yellowish-green inside, glabrous, the stamens held at the corolla mouth; stigma biglobose. Capsules and seeds unknown. Illustration. Figure 158 . Figure 158. Ipomoea ramulosa A habit B outer sepal C inner sepal. Drawn by Rosemary Wise from Kruse 964. Distribution. Endemic to Guerrero in Mexico, growing in a damp gully on alluvial soil at 745 m. MEXICO. Guerrero. Type collection. Note. A very distinctive species because of the winged stem, deeply 3-lobed leaves, much-branched, almost paniculate inflorescence and the aristate sepals. The white flowers are reported to be aromatic. Molecular sequencing using ITS suggests a relationship with Ipomoea costellata and its allies but there is little superficial morphological similiarity apart from the aristate sepals and trilobed leaves.