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| Argyreia subrotunda Q.R.Liu & M.L.Zhang, in Zhang, He et Liu, 2023. |
Abstract
Argyreia subrotunda, a new species from Yunnan Province, China, is described and illustrated. The new species resembles A. fulvocymosa and A. wallichii, but differs from these in the flowers with an entire or shallowly lobed corolla, as well as smaller elliptic bracts, lax flat-topped cymes and shorter corolla tubes. An updated key to the species of Argyreia from Yunnan province is also provided.
Keywords: Argyreia subrotunda, flora of Yunnan, morphology, new taxon, taxonomy
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| Argyreia subrotunda Q.R.Liu & M.L.Zhang, sp. nov. A stem with leaves and inflorescences B bract (outside) C bract (inside) D sepals from outer (left) to innermost (right) E opened corolla showing mid-petaline bands F opened corolla with stamens G pistil H fruit with persistent sepals I seed (adaxial surface) J seed (lateral surface). All drawn by Quan-Ru Liu from voucher specimens M. L. Zhang BNU2021YN074 (BNU!) (A–G), X. B. Guo BNU2021YN081 (BNU!) (H–J). |
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| Argyreia subrotunda Q.R.Liu & M.L.Zhang, sp. nov. A plant habit B inflorescence C flower in frontal view D fruit with persistent sepals E seeds: adaxial surface (left); lateral surface (right). Scale bar: 5 mm. Photographs A–C, E by Mao-Lin Zhang, D by Xi-Bing Guo. |
Argyreia subrotunda Q.R.Liu & M.L.Zhang, sp. nov.
Diagnosis: A. subrotunda is unique, a small-flowered type with an entire or shallowly lobed corolla as well as exserted stamens and pistils (included in dry specimens), smaller elliptic bracts, and outer sepals ovate-circular. It is similar to A. wallichii in indumentum features (whitish tomentose) and fruit types (red globose berry), but differs by its smaller elliptic bracts (vs. ovate-oblong), lax flat-topped cymes (vs. compact capitate) and shorter corolla tubes (2–2.5 cm vs. 4–5 cm). Additionally, A. subrotunda is similar to A. fulvocymosa in leaf shape (broadly ovate-circular to nearly circular) and inflorescence (flat-topped cymes), but the latter is covered with densely yellowish villus and has a distinctly 5-lobed corolla, which is very easy to distinguish (Table 1).
Etymology: The specific epithet refers to the leaf shape, which is near-round.
Chinese name: 近圆叶银背藤
(Jìn Yuán Yè Yín Bèi Téng).
Mao-Lin Zhang, Yi He and Quan-Ru Liu. 2023. A New Species of Argyreia (Convolvulaceae) from Yunnan, China. PhytoKeys. 225: 199-209. DOI: 10.3897/phytokeys.225.100646
