Coccoloba efigeniana and C. ibarrae, two new species of Coccoloba sect. Paniculatae Meisn. (Polygonaceae) Author Ancona, Juan J. Herbario UADY, Departamento de Botánica, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán. Carretera Mérida-Xmatkuil, km 15.5, Mérida, Yucatán Author Ortiz-Díaz, Juan J. Herbario UADY, Departamento de Botánica, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán. Carretera Mérida-Xmatkuil, km 15.5, Mérida, Yucatán Author Tun-Garrido, Juan Herbario UADY, Departamento de Botánica, Campus de Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán. Carretera Mérida-Xmatkuil, km 15.5, Mérida, Yucatán text Phytotaxa 2023 2023-06-06 599 2 100 108 http://dx.doi.org/10.11646/phytotaxa.599.2.2 journal article 10.11646/phytotaxa.599.2.2 1179-3163 8008923 Key for the identification of the species of Coccoloba sect. Paniculatae occurring in Mexico and Central America 1 Panicles small, 2‒3(‒4) branches .......................................................................................................................................................2 - Panicles large,> 5 branches ...............................................................................................................................................................5 2 Petiole pubescent to puberulent, nerves dense to sparsely puberulent, fruit 9.8‒10.3 × 8.8‒9.14 mm ................. Coccoloba hirtella - Petiole glabrous, nerves glabrous, fruit ≤ 8 mm long, ≤ 7.6 mm wide ..............................................................................................3 3 Leaf blade chartaceous, base asymmetric, apex long acuminate ........................................................................ Coccoloba montana - Leaf blade coriaceous, base symmetrical, apex rounded to slightly acute.........................................................................................4 4 Leaf blade obovate to oblanceolate-obovate, base cuneate, petiole ≤ 1cm long..................................................... Coccoloba lasseri - Leaf blade elliptic-oblong, base subcordatae, petiole 1.0– 1.5 cm long .............................................................. Coccoloba matudae 5 Panicle spiciform ................................................................................................................................................................................6 - Panicle racemose ................................................................................................................................................................................7 6 Ochrea, petioles and leaf blades hirsutulous when mature, fruit obpyramidal, pilosulose .............................. Coccoloba efigeniana - Ochrea, petioles and leaf blades glabrous when mature, fruit ovoid, glabrous.................................................. Coccoloba belizensis 7 Leaf-blades obovate to broadly elliptic oblong, glabrous or with few trichomes along the axils beneath, panicle branches glabrous, fruit ovoid without prominent ribs, tepals not crowned ............................................................................... Coccoloba tuerckheimii - Leaf blades oblong-elliptic to obovate-elliptic, puberulent beneath, with short trichomes on veins, panicle branches puberulent, fruit ovoid with prominent ribs, tepals crowned ................................................................................................... Coccoloba ibarrae