Ipomoea concolor (Matuda) D. Austin

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

181. Ipomoea concolor (Matuda) D. Austin , Ann. Missouri Bot. Gard. 64: 335. 1977 [pub. 1978]. (Austin 1978: 335)

Exogonium concolorum Matuda , Anales Inst. Biol. Univ. Nac. México 36: 116. 1965. (Matuda 1965: 116). Type. MEXICO. Guerrero, Rincón de la Vía, H. Kruse 844 (holotype MEXU00092233; isotypes IEB, MEXU).

Ipomoea praecox McPherson & Meacham , Contr. Univ. Michigan Herb. 14: 85. 1980. (McPherson 1980: 85), nom. illeg., non Ipomoea praecox C. Wright (1870) . Type. MEXICO. Oaxaca, limestone hillside SW of Sola de Vega, R. Moran 10095 (holotype UC1235383).

Ipomoea mcphersonii D.F. Austin , Taxon 45: 12. 1996. (Austin and Huáman 1996: 12). Type. Based on Ipomoea praecox McPherson & Meacham

Type.

Based on Exogonium concolorum Matuda

Description.

Climbing perennial; stems woody to 2 m, pubescent. Leaves petiolate, 8-12 × 7-9 cm, broadly ovate, apex abruptly and shortly acuminate, base truncate and shortly cuneate onto the petiole, adaxially glabrous to thinly pubescent, abaxially tomentose, paler; petioles 5-7 cm, pubescent. Inflorescence a dense, many-flowered pedunculate cyme; primary peduncles 1-2.5 cm, tomentose; bracteoles 3-5 mm, lanceolate, caducous; secondary peduncles 1-4 mm; pedicels 4-12 mm, sericeous; sepals subequal, 7-8.5 × 3.5-4.5 mm, ovate-elliptic, obtuse, coriaceous, reddish, pubescent, the inner sepals more densely pubescent but with glabrous, scarious margins; corolla 3-4 cm long, tubular-hypocrateriform, dark pinkish-red, sericeous, limb lobed, the lobes 3-6 mm long, ovate, obtuse; stamens exserted. Capsules 22 mm long (fide Matuda), conical, glabrous; seeds 7-8 × 5 mm, densely pilose on the margins with white hairs c. 8 mm long.

Illustration.

McPherson (1980: 87).

Distribution.

Limestone rocks in scrub at c. 750 m. Endemic to southern Mexico.

MEXICO. Guerrero: Chilpancingo, E. Matuda & E. Halvenger s.n. (MEXU). Oaxaca: Ghiesbrecht s.n. (P); Pochutla, San Miguel del Puerto, A. Nava Zafra et al. 618 (IEB, MEXU).

Note.

Somewhat similar to Ipomoea tehuantepecensis in habit, corolla shape and in the reddish sepals but immediately distinguished by the sericeous exterior of the corolla and sepals. Also resembles Ipomoea conzattii but differs in the much shorter corolla lobes and the sericeous corolla.