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| Camchaya bolavenensis Noyori, Komada, Soulad. & Tagane, in Noyori, Komada, Souladeth & Tagane, 2022. |
Abstract
A new species Camchaya bolavenensis (Asteraceae: Vernonieae: Centrapalinae) from Dong Hua Sao National Protected Area located in Bolaven Plateau, southern Laos, is described and illustrated. It resembles C. gracilis and C. thailandica in morphology but distinguished by its basally decumbent stem, margin of lamina with distinct (1–)2–3 teeth, 2–4 mm long on each side, invisible secondary veins, and a capitulum with 10–30 of florets.
Keywords: Asterales, Compositae, Dong Hua Sao NPA, flora of Laos, Indochina, taxonomy
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| Camchaya bolavenensis Noyori, Komada, Soulad. & Tagane. A. Flowering plant; B. Capitula; C. Long section of floret, lateral view; D. Phyllaries, inner (left), middle (middle) and outer (right); E. Achene. Materials all from Tagane et al. L2011 (KYO). |
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| Camchaya bolavenensis Noyori, Komada, Soulad. & Tagane. A. Habit; B. Lower leaf surface; C. Capitula, lateral view; D. Capitula, apical view; E. Capitula; F. Floret; G. Anthers; H. Styles and stigmas; I. Hexaporate pollen. Materials A–E & G–H from Souladeth et al. L3349 (KAG), F from Tagane et al. L2011 (KYO) and I from Tagane et al. L2011 (KAG). |
Camchaya bolavenensis Noyori, Komada, Soulad. & Tagane, sp. nov.
Diagnosis:—Camchaya bolavenensis is morphologically similar to C. thailandica Bunwong et al. (2012: 53) of Thailand and C. gracilis of Thailand and Laos in the point that all of them have terminal and axillary capitulescences and phyllaries without marginal spines. However, C. bolavenensis is distinguished from these two by its basally decumbent stem (vs. entirely erect), margin of lamina with distinct (1–)2–3 teeth which is 2–4 mm long (vs. entire or serrate with 5–10 teeth less than 1 mm long), invisible secondary veins (vs. prominent and clearly visible abaxially), and 10–30 florets per capitulescence (vs. 50–70 florets).
Distribution:—Laos (Champassak Province, Bolaven Plateau).
Habitat and ecology:—Camchaya bolavenensis grows on wet thin soil over large and exposed sandstone boulders, where it grows with sphagnum moss (Sphagnum sp.), Canscora andrographioides Griff. ex Clarke (1875: 431), Eriocaulon cormosum Souladeth et al. (2020: 2), Eriocaulon sp. and some species of Poaceae. Flowering specimens were collected in December.
Etymology:—The specific epithet bolavenensis refers to the type locality, Bolaven Plateau.
Vernacular name:—Mouk Nong Luang (ມຸກຫນອງຫລວງ), suggested here.
Wataru Noyori, Natsuki Komada, Phetlasy Souladeth and Shuichiro Tagane. 2022. Camchaya bolavenensis (Asteraceae: Vernonieae), A New Species from Bolaven Plateau, southern Laos. Phytotaxa. 536(1); 1-6. DOI: 10.11646/phytotaxa.536.1.1