Quetzalcoatlia

Vázquez-García, J. Antonio, Basáñez, Miguel Cházaro, Acevedo-Rosas, Raúl, Rosales-Martínez, C. Santiago, Padilla-Lepe, Jesús, Martínez-González, Rosa E., García-Ruiz, Ignacio, Gutierrez, Byron Gutiérrez, Nieves-Hernández, Gregorio, Guzman, Ramón Cuevas, Shalisko, Viacheslav, Machuca-Núñez, J. Antonio, Hernández-López, Leticia & Muñiz-Castro, Miguel Á., 2025, Quetzalcoatlia (Crassulaceae), high small-scale diversification in western Mexico: a synopsis with four new species, Phytotaxa 695 (2), pp. 207-254 : 209-210

Key to the species of Quetzalcoatlia

1. Caespitose rosettes closely attached to the cliffs, if sinuously-pendant still close to the cliff ...........................................................2

- None caespitose rosettes, nor close to the cliffs, sinuously-pendant ramose or erect to decumbent .................................................5

2. Inflorescence length 6.0–12.0 cm, endemic to Colima ........................................................................................................ Q. glassii

- Inflorescence length 12.9–28.0 cm, endemic to Michoacán ..............................................................................................................3

3. Rosettes (2.8–)3.5–5.0 cm in diameter, from Coalcomán, Michoacán .............................................................................. Q. kristenii

- Rosettes 5.8–8.4 cm in diameter.........................................................................................................................................................4

4. Serpentine-pendant habit, flowers 14.0– 16.2 mm in diameter, from Chorros del Varal, Michoacán ....................... Q. itzicuaroensis

- Erect, possibly decumbent, flowers 20.0–21.0 mm in diameter, from Aguililla, Michoacán ......................................... Q. latipetala

5. Stems 0.9–1.4 cm in diameter, tuberculate.........................................................................................................................................6

- Stems ≤ 0.9 cm in diameter, smooth....................................................................................................................................................7

6. Basal leaves navicular, leaf apex acute without an apical mucro, inflorescence 8.0–29.0 cm, branches per full-size inflorescence 7–9, corolla tube 3.7–3.8 mm, petals yellowish with purple spots on the apex, from El Grullo, Sierra de Amula, Jalisco ................ ....................................................................................................................................................................................... Q. grulloensis

- Basal leaves flat, leaf apex obtuse with an apical mucro, inflorescence 30.0–40.0 cm, branches per full-size inflorescence 12– 15, corolla tube 2.9–3.1 mm, petals proximally creamy-white to distally red wine and inconspicuously striped, from Juchitlán, Jalisco ................................................................................................................................................................................. Q. superba

7. Flower diameter 14.9–18.0 mm.........................................................................................................................................................8.

- Flower diameter 8.5–13.1 mm ...........................................................................................................................................................9.

8. Plants 40.0–96.0 cm tall, flower diameter 14.9–15.1 mm, petal width 2.9–3.0 mm, from the slopes of Nevado de Colima .............. .............................................................................................................................................................................. Q. rosanevadoensis

- Plants 19.0–24.0 cm tall, flower diameter 17.9–18.0 mm, petal width 1.7–1.75 mm, only known from cultivation.......................... ........................................................................................................................................................................................ Q. pentandra

9. Number of flowers per full-size inflorescence (10–)15–27, flower diameter 8.5–11.0 mm, corolla lobes 3.9–4.0 mm long, petals whitish-pale yellow with red spots, diffuse horizontal stripes toward the apex, orange-yellow near the base, from the westernmost Sierra de Manantlán, Jalisco .................................................................................................................................. Q. santanamichelii

- Number of flowers per full-size inflorescence 30–50, flower diameter 12.9–13.1 mm, corolla lobes 4.9–5.2 mm long, petals proximally greenish to distally red & striped, from Sierra de Tapalpa, Jalisco .................................................................. Q. trujilloi