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| Hoya sungwookii Aver., Vuong, Nhan et V. C. Nguyen, in Tran, V.C. Nguyen, Averyanov, Truong, Dang, V.K. Nguyen, Maisak, Q.B. Nguyen et Krupkina, 2024. Photos by Van Canh Nguyen and Ba Vuong Truong |
Abstract
A new species, Hoya sungwookii, discovered in southern Vietnam near Nha Trang Town (Khanh Hoa Province) is described and illustrated. It belongs to the type section of the genus and is distinguished from the morphologically closest H. oblongacutifolia (= H. graveolens) in glabrous pedicels, smaller flower 1.1–1.4 cm across, greenish ciliate calyx, corolla abaxially light green, small green to dark green corona 4.5–5 mm in diameter, 1.6–1.8 mm tall, small, 2–2.2 mm long, corona segments, and short corona segment inner angle, not exceeding anthers. Additionally, data on ecology, phenology, distribution of newly described species are presented, as well as its evaluated conservation status and color illustrations. Taking into consideration our new data, the genus in Vietnam currently includes 45 species.
Keywords: Asclepioideae, Eastern Indochina, endemism, flora, Hoya oblongacutifolia, Hoya sect. Hoya, Khanh Hoa Province, plant conservation, plant diversity, plant taxonomy
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| Hoya sungwookii: A – plant in natural habitat in locus classicus; B – fresh flattened flowering plant; C – flattened shoot of plant in cultivation; D – intact inflorescences; E – spotted and uniform green leaves, adaxial and abaxial side; F – separated inflorescence; G – separated flowers, side view; H – pedicels with calyx and ovary; I – calyx and ovary; J – flower, frontal view; K – corolla, view from below; L–N – corona, views from above, from side, and from below; O – sagittal section of corona and ovary. Photos by Van Canh Nguyen and Ba Vuong Truong from plant used for the preparation of the holotype specimen VNM 00070356, photo correction and design by L. Averyanov and T. Maisak. |
Hoya sungwookii Aver., Vuong, Nhan et V. C. Nguyen, sp. nov.
Diagnosis. The new species is morphologically closest to Hoya oblongacutifolia, from which it differs in glabrous pedicels, smaller flower 1.1–1.4 cm across, greenish ciliate calyx, corolla abaxially light green, small green to dark green corona 4.5–5 mm in diameter, 1.6–1.8 mm tall, small corona segments, 2–2.2 mm long, and short corona segment inner angle, not exceeding anthers
Etymology. The species is named after Mr. Um Sung Wook, who first found this plant in nature and kindly shared his discovery for our study.
T. T. N. Tran, V. C. Nguyen, Leonid V. Averyanov, B. V. Truong, V. S. Dang, V. K. Nguyen, Tatyana V. Maisak, Q. B. Nguyen and Lyudmila I. Krupkina. 2024. New Species, Hoya sungwookii (Apocynaceae, Asclepiadoideae), from southern Vietnam. Turczaninowia. 27(1); 72-80. DOI: 10.14258/turczaninowia.27.1.10 http://turczaninowia.asu.ru/article/view/15065
