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| Cheilocostus candidus Škorničk., Böhmová & H.Ð.Trần, in Leong-Škorničková, Böhmová & Trần, 2022. |
Abstract
Cheilocostus candidus sp. nov. (Costaceae), a basally flowering spiral ginger with cream white flowers from southern Vietnam, is described and illustrated here. A new combination, Cheilocostus tonkinensis (Gagnep.) Škorničk., is proposed here and the lectotype is designated. A key to Cheilocostus in Vietnam is included.
Keywords: Asia, Cheilocostus candidus, Cheilocostus tonkinensis, Costus, Hellenia, lectotype, spiral gingers
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| Cheilocostus candidus Škorničk., Böhmová & H.Ð.Trần sp. nov. A habit B leaves C detail of young stem with pulvini and bases of leaf blades D detail of young and old stems covered with leaf sheaths E detail of lower surface of the leaf blade. Based on plant used to prepare the type specimen Leong-Škorničková GRC-421, photo by Jana Leong-Škorničková. |
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| Cheilocostus candidus Škorničk., Böhmová & H.Ð.Trần sp. nov. A old and young inflorescence B flower C flower dissection (from left): bract, bracteole, calyx, ovary, dorsal corolla lobe, two lateral corolla lobes, floral and staminal tube with stamen attached, labellum D detail of floral (ft) and staminal tube (st) with stamen attached from side and dorsal view E detail of floral and staminal tube dissected with stamen attached to dorsal half (inset: detail of stigma). Based on plant used to prepare the type specimen Leong-Škorničková GRC-421, photo by Jana Leong-Škorničková. |
Cheilocostus candidus Škorničk., Böhmová & H.Ð.Trần, sp.nov.
Diagnosis: Similar to Ch. tonkinensis by its inflorescence appearing at the base of the leafy shoots, but differs by its unbranched or very sparsely branched stems, densely puberulent leaf sheaths, densely puberulous lower side of lamina and cream-white flowers (compared to densely branched stems, glabrous leaf sheaths, glabrous lamina on both sides and yellow flowers with red markings on basal part of the labellum).
Etymology: The specific epithet refers to the white colour of the flower.
Jana Leong-Škorničková, Alžběta Böhmová and Hữu Đăng Trần. 2022. A New Species and New Combination in Basally Flowering Vietnam Costaceae. PhytoKeys. 190: 103-111. DOI: 10.3897/phytokeys.190.76494