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| Meiogyne oligocarpa B.Xue & Y.H.Tan in Xue, Shao, Xiao, ... et Tan, 2021. |
Meiogyne oligocarpa sp. nov. (Annonaceae) is described from Yunnan Province in Southwest China. It is easily distinguished from all previously described Meiogyne species by the possession of up to four carpels per flower, its bilobed, sparsely hairy stigma, biseriate ovules and cylindrical monocarps with a beaked apex. A phylogenetic analysis was conducted to confirm the placement of this new species within Meiogyne. Meiogyne oligocarpa represents the second species of Meiogyne in China: a key to the species of Meiogyne in China is provided to distinguish it from Meiogyne hainanensis. Paraffin sectioning was undertaken to study the anatomy of the corrugations on the inner petals of Meiogyne oligocarpa to verify whether they are glandular.
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| Figure 4: Line drawing of Meiogyne oligocarpa sp. nov. (A) Flowering branch. (B) Flower, lateral view. (C) Sepals, ad- and abaxial view. (D) Outer petals, ad- and abaxial view. (E) Inner petals, ad- and abaxial view; adaxial view showing the corrugations at the base. (F) Innermost stamen, ad- and abaxial view; adaxial view showing the elongated tongue-shaped apical prolongation. (G) Outer stamen, ad- and abaxial view. (H) Carpel, showing bilobed stigma. (I) Carpel, longitudinal section, showing the biseriate ovule arrangement. (J) Fresh fruit. (K) Dried fruit, showing monocarp shallowly transversely constricted between seed. (L) Seed. Drawn by Ding-Han Cui, from C. F. Xiao C400733 (IBSC). |
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| Figure 2: Flower and fruit morphology of Meiogyne oligocarpa sp. nov. (A) Lateral view of the flower. (B) Abaxial view of the flower. (C) Adaxial view of the flower, showing corrugated structure at the base of the inner petals, and the bilobed stigma. (D) Adaxial and abaxial surface of the inner petals, showing the corrugated structure at the base of the adaxail surface of the inner petals, and the pubescent indumentum at the abaxial surface. (E) Flower with the petals removed, showing the sepals, stamens and stigmas. (F) Fruit with three monocarps. (G) Fruit with one monocarp. (H) Fruit with the pericarp removed, showing the biseriate seed arrangement. (I) Fresh Seed. (J) Dried seeds, showing the raised raphe; and the longitudinal section of the seed, showing the lamelliform endosperm ruminations (B. Yang XTBG0181, HITBC). (A, C, G by Yun-Yun Shao; B, D–F, J by Yun-Hong Tan; H–I by Chun-Fen Xiao). |
Meiogyne oligocarpa B.Xue & Y.H.Tan, sp. nov.
Diagnosis. Meiogyne oligocarpa is distinct among Meiogyne species in having a combination of characters, including up to four carpels per flower, bilobed sparsely hairy stigmas, cylindrical monocarps with a beaked apex, and seeds in two series. It is most similar to Meiogyne kanthanensis, but differs in having smaller leaves with more secondary veins, shorter pedicels, stigmas that are bilobed and distinctly less hairy, and cylindrical monocarps with a beaked apex.
Etymology. The specific epithet reflects that the flower has few carpels (1–4) and hence the fruit has few monocarps (1–3).
Bine Xue, Yun-Yun Shao, Chun-Fen Xiao, Ming-Fai Liu, Yongquan Li and Yun-Hong Tan. 2021. Meiogyne oligocarpa (Annonaceae), A New Species from Yunnan, China. PeerJ. 9:e10999. DOI:10.7717/peerj.10999
