A synthesis of the Chiococceae tribe (Cinchonoideae, Rubiaceae) in Mexico: morphology, diversity, and endemism Author Torres-Montufar, Alejandro Herbario FES-Cuautitlán, Departamento de Ciencias Biológicas. Facultad de Estudios Superiores Cuautitlán-Universidad Nacional Autónoma de México (FESC-UNAM), Carretera Cuautitlán Teoloyucan km 2.5, San Sebastián Xhala C. P. 54714, Cuautitlán Izcalli, Mexico. Author Sanchez-Bautista, Saray Facultad de Estudios Superiores Iztacala-Universidad Nacional Autónoma de México (FESI-UNAM), Av. de los Barrios 1, Los Reyes Iztacala. Tlalnepantla, Estado de México, Mexico. Author Aguilar-Morales, María Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Ciudad Universitaria, Coyoacán, Mexico City, C. P. 04510, Mexico. text Phytotaxa 2022 2022-04-01 542 1 35 52 http://dx.doi.org/10.11646/phytotaxa.542.1.3 journal article 53153 10.11646/phytotaxa.542.1.3 34a7ba26-5a45-450a-a03e-a7052dcc049f 1179-3163 6404536 Key to genera 1. Fruits drupaceous, indehiscent; seed apical attachment ....................................................................................................................2. - Fruits capsules, loculicidally or septicidally dehiscent; seed basal or medial attachment ................................................................3. 2. Ovary 2-locular; flower aestivation is valvate; corolla lobes deltoid; fruits flattended to subspheroidal........................... Chiococca - Ovary 5-10-locular; flower aestivation is imbricate; corolla lobes linear-lanceolate; fruits spheroidal ................................ Erithalis 3. Seed basal attachment............................................................................................................................................................ Lorencea - Seed medial attachment.....................................................................................................................................................................4. 4. Seeds wingless...................................................................................................................................................................................5. - Seeds winged.....................................................................................................................................................................................6. 5. Capsule dehiscent loculicidally; corolla tube 2 to 4 cm long; seeds 2 to 5 per locule ..................................................... Coutaportla - Capsule dehiscent septicidally; corolla tube 6 to 8 cm long; seeds numerous per locule...................................................... Nernstia 6. Flowers with linear corolla lobes ......................................................................................................................................................7. - Flowers with deltoid corolla lobes ................................................................................................................................................... 8. 7. Corolla tube 3 to 5 cm long; capsules flattened ................................................................................................................... Exostema - Corolla tube 1 to 2 cm long; capsules subcylindrical....................................................................................................... Solenandra . 8. Capsules flattened and septicidally dehiscent ....................................................................................................................... Coutarea - Capsules subcylindrical and loculicidally dehiscent ............................................................................................................. Hintonia