Laxoplumeria

Morales, J. Francisco & Morais, Isa Lucia De, 2018, Studies in the Neotropical Apocynaceae LII: A synopsis of Laxoplumeria with three new species, Phytotaxa 343 (1), pp. 35-46 : 36

Key to the species of Laxoplumeria

1. Petioles 50–62 mm; corolla tube 2.9–3.1 mm ......................................................................................................... L. longipetiolata

- Petioles 10–38 mm; corolla tube 3.5–7 mm ..................................................................................................................................... 2

2. Leaves pseudoverticillate to verticillate, blade elliptic; corolla lobes 2.6–2.8 mm ..................................................... L. verticillata

- Leaves alternate, blade obovate to elliptic-obovate; corolla lobes 6–17 mm ................................................................................... 3

3. Corolla lobes 15–17 mm long; pedicels 6–10 mm; nectary covering completely the ovary; petioles 10–16 mm long ..................... .......................................................................................................................................................................................... L. aberrans

- Corolla lobes 6–7.5 mm long; pedicels 1.5–3 mm; nectary ca. 1/5 of the ovary length; petioles 10–38 mm long ......................... 4

4. Leaf blade with 11–16 pairs of secondary veins; inflorescences 3–4 cm long; calyx lobes 1.5–1.6 mm; seeds 2–2.2 cm long ......... ........................................................................................................................................................................................ L. baehniana

- Leaf blade with 18–22 pairs of secondary veins; inflorescences 11–22(–25) cm long; calyx lobes 0.5–0.9 mm; seeds 0.9–1.3 cm long................................................................................................................................................................................ L. tessmannii