Tabernaemontana, Linnaeus, 1753

Alvarado-Cárdenas, Leonardo O., Lozada-Pérez, Lucio, Cadena, Joselin, Hernández, Sofia Islas-, Martínez-González, C. Ramiro, Cortez, Ericka B., González- Martínez, César A. & González-Ramírez, Ixchel S., 2019, The triad of knowledge: Systematic, diversity and conservation status of the Mexican species of Tabernaemontana (Apocynaceae; Rauvolfioideae: tribe Tabernaemontaneae), Phytotaxa 388 (1), pp. 1-46 : 11

Key to species of Tabernaemontana in Mexico.

1. Shrubs; follicles muricate ................................................................................................................................................ T. mixtecana

- Shrubs or trees; follicles smooth or striate, sometimes warty, but never muricate............................................................................2

2. Corolla infundibuliform......................................................................................................................................................................3

- Corolla hypocrateriform to slightly urceolate....................................................................................................................................7

3. Flowers white, upper tube tubular. ...................................................................................................................................... T. litoralis

- Flowers yellow, upper tube campanulate...........................................................................................................................................4

4. Blades with dense trichomes along the midvein abaxially; sepals subequal, 2–5(–7) mm long, ovate.......................... T. tomentosa

- Blades without dense trichomes abaxially; sepals mainly strongly unequal or subequal, (0.5) 0.8–2.1 cm long, ovate-lanceolate, elliptic, obovate to oblong..................................................................................................................................................................5

5. Sepals strongly unequal, obovate to oblong.......................................................................................................................... T. glabra

- Sepals equal to subequal, ovate-lanceolate, lanceolate to elliptic......................................................................................................6

6. Sepals 0.6–1 cm long, lanceolate, upper tube slightly campanulate ............................................................................. T. eubracteata

- Sepals 1.4–2.1 cm long, elliptic to ovate-lanceolate, upper tube campanulate .................................................................... T. riverae

7. Flowers white.....................................................................................................................................................................................8

- Flowers yellow to yellowish.............................................................................................................................................................12

8. Plants introduced and cultivated; flowers with doubled corolla lobes; pistils and stamens atrophied............................ T. divaricata

- Plants native; flowers without doubled corolla lobes; pistils and stamens functional.......................................................................9

9. Anthers apices slightly exerted or included......................................................................................................................................10

- Anthers almost wholly exserted.......................................................................................................................................................11

10. Corolla tube less than 1 cm long, suprastaminal corona of five bilobed callus; anthers not or slightly exserted; follicles subreniforms; on Pacific and Atlantic Slopes, but not in Jalisco ...................................................................................................................... T. alba

- Corolla tube greater than 1 cm long ; suprastaminal corona absent; anthers not exserted; follicles fusiform; endemic to Jalisco ...... ...................................................................................................................................................................................... T. chamelensis

11. Suprastaminal corona altenate the anthers ......................................................................................................................... T. citrifolia

- Suprastaminal corona opposite the anthers ................................................................................................................ T. amygdalifolia

12. Sepals not foliose, 2–5(–6) mm long................................................................................................................................................13

- Sepals foliose, 7–20 mm long..........................................................................................................................................................15

13. Corolla tube not twisted around the anthers, infrastaminal appendages absent, corolline corona absent; follicles fusiform.............. ...................................................................................................................................................................................... T. chamelensis

- Corolla tube twisted around the anthers, infrastaminal appendages present, corolline corona present; follicles obliquely ellipsoid...........................................................................................................................................................................................................14

14. Corolla tube 1.1–1.3 cm long; endemic to Colima .......................................................................................................... T. stenoptera

- Corolla tube 2.1–2.6 cm long; endemic to Oaxaca .......................................................................................................... T. oaxacana

15. Sepals strongly unequal; flowers hypocrateriform...........................................................................................................................16

- Sepals subequal; flowers slightly urceolate......................................................................................................................................17

16. Blades usually with domatia in the axils of secondary veins; stamens inserted near the middle of the tube. Follicles 4.5–9 × 4–7 cm, warty ................................................................................................................................................................. T. donnell –smithii

- Blades without domatia; stamens inserted above the middle of the tube. Follicles 2.5–3.9 × 1–1.9 cm, smooth or slightly striate ... ...................................................................................................................................................................................... T. ochoterenae

17. Corolla tube 2–2.5 cm long, with stamens inserted near the middle.................................................................................... T. hannae

- Corolla tube 1.1–1.3 cm long, with stamens inserted near the base..................................................................................... T. venusta