Ceratozamia, Brongniart (1846: 7 - 8), Brongniart, 1846

Vovides, Andrew P., Pérez-Farrera, Miguel Angel, Salinasrodríguez, María Magdalena, Galicia, Sonia, Díaz-Jiménez, Pedro, Calonje, Michael & Gutiérrez-Ortega, José Said, 2022, Morphological and anatomical analyses clarify the species definition of Ceratozamia latifolia Miq. (Zamiaceae) and lead to the description of a new species: Ceratozamia reesii, Phytotaxa 575 (3), pp. 224-252 : 242

Key to the species of the C. latifolia species complex

1a. Plants with whorled (fasciculate) leaflets.............................................................................................................................. C. hildae

1b Plants with non-whorled leaflets.

2a. Slender, linear, lanceolate leaflets up to 1.5 cm wide.

3a. Spiral rachis ..................................................................................................................................................................... C. zaragozae

3b Non-spiral rachis.

4a. Ribbed leaflets, unarmed petiole. ................................................................................................................................. C. kuesteriana

4b. Flat leaflets, not ribbed, petiole with spines ........................................................................................................................ C. sabatoi

2b. Broad leaflets, more than 1.5 cm wide.

5a. Light green or yellowish-green emerging leaves.

6a. Light green emerging leaves.

7a. Oblong leaflets .............................................................................................................................................................. C. morettii

7b. Oblanceolate leaflets.

8a. Pinnate plants with brown female cone at maturity .......................................................................................................... C. reesii

8b. Pinnate plants with olive-green female cone at maturity...................................................................................... C. huastecorum

6b. Yellowish-green emerging leaves.

9a. Papyraceous leaflets.................................................................................................................................................... C. delucana

9b. Coriaceous leaflets ..................................................................................................................................................... C. brevifrons

5b. Brown or reddish emerging leaves.

10a. Papyraceous leaflets.

11a. Unarmed petiole, rarely armed with small, short and slender spines......................................................................... C. latifolia

11b. Armed petiole thick and long spines.

12a. Leaflets 1.3–2.1 cm wide ..................................................................................................................................... C. fuscoviridis

12b. Leaflets 2.7–4.2 cm wide.................................................................................................................................... C. totonacorum

10b. Coriaceous leaflets................................................................................................................................................. C. chamberlainii