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Issue: Vol. 718 No. 3: 23 Sept. 2025
Type: Article
Published: 2025-09-23
DOI: 10.11646/phytotaxa.718.3.8
Page range: 244-248
Abstract views: 707
PDF downloaded: 11

Argostemma wardii (Rubiaceae), a new species from Ayeyarwady Region, Myanmar

Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences & Centre for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China; Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation, Mengla 666303, Yunnan, China
Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences & Centre for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China; Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation, Mengla 666303, Yunnan, China
Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences & Centre for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China; Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation, Mengla 666303, Yunnan, China
Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin 15013, Nay Pyi Taw, Myanmar
Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin 15013, Nay Pyi Taw, Myanmar
Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences & Centre for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China; Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation, Mengla 666303, Yunnan, China
Argostemmateae coffee family flora plant taxonomy Southeast Asia Eudicots

Abstract

Argostemma wardii Y.H.Tan & D.L.Quan, a new species of Rubiaceae is described and illustrated from Ayeyarwady Region, southern Myanmar. This species is closely similar to A. kurzii but can be distinguished by its typically having 2-paired leaves that are thinly papery and spatulate, lanceolate, or elliptic in shape, with bases that are attenuate, cuneate, or asymmetrical. Additionally, A. wardii has larger stipules (5–15 × 10–30 mm vs. 1 × 2–5 mm), fewer inflorescences (1 or rarely 2 vs. 1–4), shorter peduncles (1.5–6.5 cm vs. 4–12 cm), a fleshy calyx (vs. chartaceous), subtle corolla venation (vs. conspicuous), and larger bracts (2–7 × 5–12.5 mm vs. 2–3.5 × 3–5 mm) and corollas (2 × 4–4.5 mm vs. 1.5 × 2–2.5 mm), along with longer corolla tubes (0.5–1 mm vs. 0.4–0.6 mm) and anthers (2–2.5 mm vs. 1 mm).

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How to Cite

Quan, D.-L., Xie, X.-C., Yang, B., Swe, Y., Htwe, K.M. & Tan, Y.-H. (2025) Argostemma wardii (Rubiaceae), a new species from Ayeyarwady Region, Myanmar. Phytotaxa 718 (3): 244–248. https://doi.org/10.11646/phytotaxa.718.3.8