Triplostegia, Wallich ex Candolle (1830), Wallich ex Candolle, 1830

Tan, Shaolin, Fu, Qingli, Mo, Zhiqiong, Sun, Yanan, Fang, Yi & Yang, Boyun, 2024, Triplostegia alpina (Caprifoliaceae): a new species from Southwest China, Phytotaxa 640 (3), pp. 284-292 : 290

Keys

1. Taproot bifurcate, fusiformis, significantly fleshy; main taproot surface rugged; leaf sessile; corolla 4.5–10.7 mm; achene involucel apex not hooked, purple ................................................................................................................................ Triplostegia grandiflora

- Taproot bifurcate, trifurcate, or tetrafurcate, slender, slightly fleshy; main taproot surface not rugged; leaf petiolate; corolla 1.1–3.5 mm; achene involucel apex hooked, purple or greenish white ..........................................................................................................2

2. Taproot bifurcate; main taproot and lateral taproot nearly equal in size, both with numerous fine roots; achene involucel apex significantly hooked, crystal greenish white ................................................................................................ Triplostegia glandulifera

- Taproot bifurcate, trifurcate, or tetrafurcate; main taproot significantly larger than lateral taproot, main taproot with fine roots; lateral taproot glabrous white, with purple color at the upper end; achene involucel apex slightly hooked, purple ........................... ............................................................................................................................................................................... Triplostegia alpina