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| Oreocharis thanhii T.P.A. Tran, K.S. Nguyen & K. Tan, in Tran, Nguyen, Tan et Averyanov, 2023. Photos by D.D. Thanh & K.S. Nguyen |
Abstract
Oreocharis thanhii, a new species from Lai Chau Province, Northwest Vietnam, is described and illustrated. It is morphologically most similar to O. obliqua in purple flower, slender cylindrical corolla tube, and free anthers but differs from the latter by having fewer lateral veins, simple cyme or simple dichasium inflorescence, glandular-puberulent filaments and styles. Besides providing a detailed description and preliminary conservation status of this novelty, its key discriminative characteristics with related species are also presented in this paper.
Keyword: Endemism, Indochina, Lai Chau province, Oreocharis blepharophylla, Oreocharis obliqua, Trichosporeae
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| Reproductive morphology of Oreocharis thanhii. A–C: Flower, front, back and side view. D: Portion of flower, longitudinal cut. E: Dissected flower, showing opened corolla and pistil. F: Stamens and staminode. G: Pistil and calyx lobes. H: Disc. I: Mature capsule. Photos and design by K.S. Nguyen. |
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| . Illustration of Oreocharis thanhii in nature and its type specimen. A: Plants in nature. B–C: Flattened flowering plant. D: Rhizome and roots. E: Abaxial and adaxial surfaces of petiole. F: Portion of adaxial and abaxial leaf surface. G: Flower, side view. Photo A by D.D. Thanh, B–G and design by K.S. Nguyen |
Oreocharis thanhii T.P.A. Tran, K.S. Nguyen & K. Tan,
sp. nov.
Diagnosis: differs from its morphologically closest
Oreocharis obliqua in having lateral veins 5–6 (vs. 7–11)
pairs, simple cyme or simple dichasium with usually 2–4
flowers (vs. usually compound dichasium with 5–11
flowers), filaments and styles glandular-puberulent (vs.
glabrous), and mature capsule 14–16 (vs. 25–30) mm long.
Etymology: The species epithet “thanhii” refers to the
collector name Dinh Danh Thanh. In this context, the
Vietnamese name “Nhạc Ngựa Thành” is proposed.
Thi Phuong Anh Tran, Khang Sinh Nguyen, Ke Tan and Leonid V. Averyanov. 2023. Oreocharis thanhii (Gesneriaceae), A New Species from Northwest Vietnam. Taiwania. 68(3); 275-280.
