A remarkable new species of Dictyanthus (Apocynaceae, Asclepiadoideae, Asclepiadeae, Gonolobinae) restricted to Jalisco, México Author Alvarado-Cárdenas, Leonardo O. Departamento de Biología Comparada, Laboratorio de Plantas Vasculares, Facultad de Ciencias, Universidad Nacional Autónoma de México, Zip Code 70 - 282, 04510 México, CDMX, México. Author Hernández, Alexis López Calle la luz # 50, Fracc. Barrios de Arboledas. C. P. 72590. Puebla, Puebla, México. Author Crisóstomo, Raúl Sánchez Lazaro Cárdenas 13, José María Morelos. C. P. 48495. Tomatlán, Jalisco, México. text Phytotaxa 2022 2022-08-15 558 2 178 184 journal article 124040 10.11646/phytotaxa.558.2.2 6f9be3ba-7dc3-4be0-864e-72c2cd178fe7 1179-3163 7002925 A taxonomic key for the determination of species of Dictyanthus in Jalisco . 1. Flowers deeply campanulate and short corolla lobes relative to the tube ........................................................ Dictyanthus tuberosus - Flowers rotate to rotate-campanulate with corolla lobes of the similar size or larger than the tube..................................................2 2. Corolla tube with pattern of mainly vertical and parallel lines ..........................................................................................................3 - Corolla tube with pattern of reticulated lines .....................................................................................................................................6 3. Lobes of the gynostegial corona widely ovate; stylar head apex flat or concave .............................................. Dictyanthus sepicola - Lobes of the gynostegial corona rhombuses, linear, spatulate or globular; stylar head apex convex ................................................4 4. Flowers less than 2 cm in diameter; lobes of the gynostegial corona rhomboid; stylar head reddish to purple, apex exserted from the corolla tube ................................................................................................................................................ Dictyanthus nichongus - Flowers of 3 cm or more in diameter; lobes of the gynostegial corona linear or spatulate; stylar head whitish to pink or brownish, included in corolla tube ......................................................................................................................................................................5 5. Inflorescence of solitary flowers; corolla brownish; lobes of the gynostegial corona reaching the mouth of the corolla tube and with two appendages (teeth) at the middle of its length ................................................................................. Dictyanthus macvaughianus - Inflorescences with 3 flowers; corolla white; lobes of the gynostegial corona below the the mouth of the corolla tube and without appendages .......................................................................................................................................................... Dictyanthus pavonii 6. Lobes of the gynostegial corona globular .............................................................................................................. Dictyanthus asper - Lobes of the gynostegial corona linear or spatulate ...........................................................................................................................7 7. Flowers 1 cm in diameter; lobes of the gynostegial corona linear, 1‒1.5 mm long....................................... Dictyanthus parviflorus - Flowers 2 cm in diameter; lobes of the gynostegial corona spatulate, 5‒8 mm long..................................... Dictyanthus reticulatus