Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), a new species from Vietnam
Nguyen TTH, Le NH, Tran DB and others. PhytoKeys, September 2026.
Read the paper Free to read · doi:10.3897/phytokeys.279.203612
What this paper is about
A new species of Vincetoxicum, a milkweed relative, described from Vietnam and compared in detail against the three species it most resembles.
It differs in pedicel and petiole length, leaf size and hairiness, corolla size and color, pollinium shape, and fruit and seed length. Of interest mainly for the taxonomy of the subfamily rather than for anything in North America.
Summarised here from the abstract below. Not the authors’ words.
Abstract
Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), a new species from Vietnam, is described, illustrated, and compared with three morphologically similar species: Vincetoxicum flexuosum (R.Br.) Kuntze, V. harmandii (Costantin) Meve & Liede, and V. tengii (Tsiang) Meve & Liede. V. phucanhense differs from V. flexuosum in having shorter pedicels, very sparsely hairy sepal margins (vs. glabrous), a larger corolla, broadly elliptic pollinia (vs. globose), longer fruits, and longer seeds. It also differs from V. harmandii in having shorter petioles, smaller leaf blades, glabrous adaxial leaf surfaces (vs. hairy), and a larger corolla. In comparison with V. tengii, V. phucanhense can be distinguished by its larger corolla, corolla coloration (yellow, pink, or red vs. greenish), and broadly elliptic pollinia (vs. globose). A key to the 14 species of Vincetoxicum recorded in Vietnam is provided.
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Milkweed USA. (2026). Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), a new species from Vietnam (listing). Retrieved DATE, from https://milkweedusa.com/research/vincetoxicum-phucanhense-apocynaceae-asclepiadoideae-a-new-species-from-vietnam-2026/
"Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), a new species from Vietnam (listing)." Milkweed USA, 2026, https://milkweedusa.com/research/vincetoxicum-phucanhense-apocynaceae-asclepiadoideae-a-new-species-from-vietnam-2026/. Accessed DATE.
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title = {Vincetoxicum phucanhense (Apocynaceae, Asclepiadoideae), a new species from Vietnam (listing)},
author = {{Milkweed USA}},
year = {2026},
url = {https://milkweedusa.com/research/vincetoxicum-phucanhense-apocynaceae-asclepiadoideae-a-new-species-from-vietnam-2026/},
note = {Accessed DATE}
}