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| Aristolochia yachangensis B.G.Huang, Yan Liu & Y.S.Huang in Luo, Ni, Jiang, ... et Huang, 2020. |
Abstract
Aristolochia yachangensis B.G.Huang, Yan Liu & Y.S.Huang, a new species from limestone areas in Guangxi, China, is described and illustrated. It is morphologically most similar to A. fangchi Y.C.Wu ex L.D.Chow & S.M.Hwang, A. petelotii O.C. Schmidt and A. championii Merr. & Chun in shape of leaf blade, anther, gynostemium and inflorescence on old woody stems. However, it can be easily distinguished from the latter by shape of inflorescence, length of upper and lower portions of perianth tube, colour of the limb and throat. A table and a key to distinguish the new species from other morphologically similar Aristolochia species are also provided.
Keywords: Aristolochia, limestone flora, new taxa, north-western Guangxi, taxonomy
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| Figure 2. Aristolochia yachangensis B.G.Huang, Yan Liu & Y.S.Huang, sp. nov. A habitat B flowering branch C flowers (front view) D flower (lateral view) E flower bud F longitudinally dissected flower (showing the inside structure) G longitudinally dissected flower (dorsal view) H old phase of gynostemium (vertical view) I old phase of anthers and gynostemium (lateral view) J ovary K young capsule L mature capsule. Photographed by Shuwan Li. |
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| Figure 2. Aristolochia yachangensis B.G.Huang, Yan Liu & Y.S.Huang, sp. nov. A habit B flowering branch C flower (front view) D longitudinally dissected flower (showing the inside structure) E anthers and gynostemium (lateral view) F old phase of gynostemium (vertical view) G capsule. Drawn by Wenhong Lin (IBK). |
Aristolochia yachangensis B.G.Huang, Yan Liu & Y.S.Huang, sp. nov.
Diagnosis: Aristolochia yachangensis is morphologically similar to A. fangchi Y.C.Wu ex L.D.Chow & S.M.Hwang, A. petelotii O.C.Schmidt and A. championii Merr. & Chun, but can be distinguished from them by stems irregularly striate, sparsely yellowish-brown pubescent or glabrous; leaf blade 1.5–3 cm wide; cymes on old woody stems; basal portion of perianth tube 2–3 cm long, shorter than the upper; limb yellow, with dark purple mural–like stripes; throat yellow; capsule ellipsoid.
Detailed morphological comparisons amongst the four species of A. yachangensis, A. championii, A. petelotii and A. fangchi are summarised in Table 1.
Etymology: The specific epithet is derived from the type locality, Yachang Orchid National Nature Reserve, Guangxi, China. The Chinese name is given as “雅长马兜铃”.
Ya Jin Luo, Shi Dong Ni, Qiang Jiang, Bo Gao Huang, Yan Liu and Yu Song Huang. 2020. Aristolochia yachangensis, A New Species of Aristolochiaceae from Limestone Areas in Guangxi, China. PhytoKeys. 153: 49-61. DOI: 10.3897/phytokeys.153.52796
