taxonID	type	description	language	source
E5FA26BEBE5355D98FCAE412C44014EC.taxon	etymology	Etymology. This species is currently found only in limestone areas, so we have retained the Chinese name 石山天胡荽 [Pinyin: shí shān tiān hú suī] of Hydrocotyle calcicola.	en	Wen, Jun, Zhu, Jun-Wen, Zhu, Ren-Bin, Song, Chun-Feng (2025): Taxonomic studies on the genus Hydrocotyle (Apiales) from China: The distribution and morphology of H. chiangdaoensis, with H. calcicola reduced to a synonym. PhytoKeys 255: 247-260, DOI: 10.3897/phytokeys.255.149589
E5FA26BEBE5355D98FCAE412C44014EC.taxon	description	Description. Herbs, 15 – 60 cm tall, glabrous. Stems erect or ascending, slender, branched, with ascending branches 2 – 20 cm long, rooting only at nodes of the basal stem and never elsewhere. Membranous leaves subrounded or cordate, gradually smaller above, palmately 5 – 9 - lobed, lobes usually crenate at the margin, conspicuously covered with sparse spiny hairs above towards the veins, glabrous beneath, 0.5 – 4.5 cm long, 0.7 – 4 cm wide. Petiole 0.7 – 3.5 (5) cm long, glabrous. Stipules membranous flabellate-orbiculate, 1 – 5 mm wide, palmate-dissected or irregularly. Terminal umbels cymose, umbels 2 – 3, and usually solitary at the other nodes; slender peduncles not quite equaling, 0.5 – 10 mm long; umbel 2 – 5 - flowered, sessile; bracts ovate-lanceolate, about 1 mm long; petals ovate-lanceolate, about 0.5 mm long, white, 4 or 5; membranous filaments equal to or slightly shorter than the petals; anthers ovate; style about 0.2 mm long. Mericarps broadly ovate or subcordate, 1 – 1.3 mm long, 0.8 – 1.2 mm wide, with papillose setae in the furrow or sometimes smooth on the outside, ribs conspicuously convex. The mericarps are not easy to separate when mature.	en	Wen, Jun, Zhu, Jun-Wen, Zhu, Ren-Bin, Song, Chun-Feng (2025): Taxonomic studies on the genus Hydrocotyle (Apiales) from China: The distribution and morphology of H. chiangdaoensis, with H. calcicola reduced to a synonym. PhytoKeys 255: 247-260, DOI: 10.3897/phytokeys.255.149589
E5FA26BEBE5355D98FCAE412C44014EC.taxon	distribution	Distribution. China (Yunnan: Jinghong, Lincang, Pu’er), Myanmar (Southern Shan State: Ywangan Township), and Thailand (Chiang Mai).	en	Wen, Jun, Zhu, Jun-Wen, Zhu, Ren-Bin, Song, Chun-Feng (2025): Taxonomic studies on the genus Hydrocotyle (Apiales) from China: The distribution and morphology of H. chiangdaoensis, with H. calcicola reduced to a synonym. PhytoKeys 255: 247-260, DOI: 10.3897/phytokeys.255.149589
