Argostemma wardii (Rubiaceae), a new species from Ayeyarwady Region, Myanmar Author Quan, Dong-Li 0000-0002-0749-2007 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 quandongli@xtbg.ac.cn Author Xie, Xing-Chi 0009-0000-4956-8682 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 xiexingchi@xtbg.ac.cn Author Yang, Bin 0000-0001-9791-5159 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 yangbin2018@xtbg.ac.cn Author Swe, Yadanar 0009-0003-3434-8312 Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin 15013, Nay Pyi Taw, Myanmar yadanarswe.ydns@gmail.com Author Htwe, Kaung Myat 0009-0004-9246-7640 Forest Research Institute, Forest Department, Ministry of Natural Resources and Environmental Conservation, Yezin 15013, Nay Pyi Taw, Myanmar kaungmyathtweusui@gmail.com Author Tan, Yun-Hong 0000-0001-6238-2743 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 tyh@xtbg.org.cn text Phytotaxa 2025 2025-09-23 718 3 244 248 https://doi.org/10.11646/phytotaxa.718.3.8 journal article 314472 10.11646/phytotaxa.718.3.8 eb27b73a-f3ed-4ce3-af4e-8ea3982c63e8 1179-3163 18413176

TABLE 1. Morphological comparisons of Argostemma wardii and A. kurzii (Hooker 1880, Sridith 2009).

Characters	A. wardii	A. kurzii
Stipules	5–15 × 10–30 mm	1 × 2–5 mm
Petioles	subsessile to 15 mm	subobsolete to 4 mm
Pairs of leaves	(1–) 2 pairs	1 pair (rarely 2 pairs)
Leaf shape	spatulate or lanceolate to elliptic, base attenuate to cuneate or asymmetrical	ovate, base rounded or subcordate
Leaf indumentum	adaxially sparsely strigose, abaxially glabrous	glabrous
Leaf texture	thinly papery	membranous
Inflorescences	generally 1 (rarely 2) inflorescence(s)	1–4 inflorescence(s)
Peduncles length	1.5–6.5 cm	4–12 cm
Bracts	2–7 × 5–12.5 mm	2–3.5 × 3–5 mm
Pedicels length	0.5–1.6 cm	0.5–1 cm
Calyx	fleshy	chartaceous
Corolla tube length	short to 0.5–1 mm	2.5–3 mm
Corolla	2 × 4–4.5 mm	1.5 × 2–2.5 mm
Corolla venation	inconspicuous	conspicuous
Filaments length	0.5–1 mm	0.4–0.6 mm
Anthers length	2–2.5 mm	1 mm