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| Erythroxylum austroguangdongense C. M. He, X. X. Zhou & Y. H. Tong, in He, Zhou, Ye, Chen et Tong, 2022. 南粤古柯 || DOI: 10.3897/phytokeys.202.84688 |
Abstract
Erythroxylum austroguangdongense (Erythroxylaceae), a new species from Guangdong Province, China, is described and illustrated. This new species is morphologically most similar to E. calyptratum, but is distinguished by the leathery leaf blade with fewer pairs of secondary veins and flowers borne on leafless nodes of the basal part of the current branch with much longer pedicels and sub-rectangular petal appendages. This is the second native species of Erythroxylum recorded from China.
Keywords: Coca family, morphology, taxonomy
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| Erythroxylum austroguangdongense A flowering branches B leafy branches C female flowers D male flower E stipule, showing fimbriate margin F flower bud, showing calyx G petals, adaxial (left), lateral (middle) and abaxial (right) view H androecium I staminodes and pistil J cross section of ovary, showing one fertile locule (low right) K–L fruits. Scale bars: 3 mm (H); 2 mm (E–G, I); 1 mm (J). Photographs A–B by Xin-Xin Zhou D, K by Wei-Jun Chen H by Xue-He Ye and others by Chun-Mei He. |
Erythroxylum austroguangdongense C. M. He, X. X. Zhou & Y. H. Tong, sp. nov.
Diagnosis: Most similar to E. calyptratum Komada & Tagane in having reddish brown to grayish brown branches with dense lenticels, and white petals with appendages, but distinguished by the leathery (vs. thinly chartaceous) leaf blade with fewer pairs of secondary veins (6–8 pairs vs. 11–15 pairs), and flowers borne on leafless nodes of the basal part of current branch (vs. in leaf axils) with longer pedicels (1–1.5 cm vs. 5.2–7 mm) and sub-rectangular petal appendage (vs. bilobed appendage with each lobe consisting of a short anterior auricle and a large posterior auricle). A more detailed comparison of the two species is shown in Table 1.
Etymology: The species epithet is named after the distribution area of this new species, South Guangdong.
Vernacular name: 南粤古柯 (Chinese pinyin: nán yuè gŭ kē).
Chun-Mei He, Xin-Xin Zhou, Xue-He Ye, Weijun Chen and Yi-Hua Tong. 2022. Erythroxylum austroguangdongense (Erythroxylaceae), A New Species from Guangdong, China. PhytoKeys. 202: 133-138. DOI: 10.3897/phytokeys.202.84688
