Dictyanthus, Decaisne, 1844

Alvarado-Cárdenas, Leonardo O., Hernández, Alexis López & Crisóstomo, Raúl Sánchez, 2022, A remarkable new species of Dictyanthus (Apocynaceae, Asclepiadoideae, Asclepiadeae, Gonolobinae) restricted to Jalisco, México, Phytotaxa 558 (2), pp. 178-184 : 183

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