New orchids in the flora of Vietnam VII (Orchidaceae: tribes Cypripedieae, Cranichideae, Orchideae, and Collabieae) Author Averyanov, Leonid V. 0000-0001-8031-2925 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Street, 197376 St. Petersburg, Russia & av _ leonid @ mail. ru; https: // orcid. org / 0000 - 0001 - 8031 - 2925 av_leonid@mail.ru Author Nguyen, Van Canh 0000-0001-9578-0342 Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam & nguyenvancanh @ tdmu. edu. vn; https: // orcid. org / 0000 - 0001 - 9578 - 0342 nguyenvancanh@tdmu.edu.vn Author Vuong, Truong Ba 0000-0003-3452-8455 Institute of Tropical Biology, Vietnam Academy of Science and Technology, 85, Tran Quoc Toan, District 3, Ho Chi Minh City, Vietnam Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam & bavuong 2019 @ yahoo. com; https: // orcid. org / 0000 - 0003 - 3452 - 8455 bavuong2019@yahoo.com Author Nguyen, Khang Sinh 0000-0001-5171-4140 Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam & nskhang @ gmail. com; https: // orcid. org / 0000 - 0001 - 5171 - 4140 nskhang@gmail.com Author Nuraliev, Maxim S. 0000-0001-8291-2633 Department of Higher Plants, Biological Faculty, M. V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, 119234 Moscow, Russia & Joint Russian-Vietnamese Tropical Scientific and Technological Center, 63, Nguyen Van Huyen Street, Cau Giay, 122000 Hanoi, Vietnam & max. nuraliev @ gmail. com; https: // orcid. org / 0000 - 0001 - 8291 - 2633 max.nuraliev@gmail.com Author Nguyen, Cuong Huu 0000-0003-2281-741X Vietnam National University of Forestry, Xuan Mai, Chuong My, Hanoi, Vietnam & nguyenhuucuong. tvr @ gmail. com; https: // orcid. org / 0000 - 0003 - 2281 - 741 X nguyenhuucuong.tvr@gmail.com Author Ormerod, Paul A. P. O. Box 8210, Cairns 4870, Queensland, Australia & wsandave 1 @ bigpond. com; https: // orcid. org / 0000 - 0002 - 2312 - 2452 wsandave1@bigpond.com Author Maisak, Tatiana V. Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Street, 197376 St. Petersburg, Russia Author Diep, Dinh Quang Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam Author Lyskov, Dmitry F. Department of Higher Plants, Biological Faculty, M. V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, 119234 Moscow, Russia & Joint Russian-Vietnamese Tropical Scientific and Technological Center, 63, Nguyen Van Huyen Street, Cau Giay, 122000 Hanoi, Vietnam Author Nong, Duy Van Tay Nguyen Institute for Scientific Research, Vietnam Academy of Science and Technology, Dalat, Vietnam text Phytotaxa 2023 2023-10-11 619 4 255 276 http://dx.doi.org/10.11646/phytotaxa.619.4.1 journal article 10.11646/phytotaxa.619.4.1 1179-3163 8430545 Goodyera umbonata Aver., V.C.Nguyen & Ormerod , sp. nov. ( Fig. 2 ) Diagnosis :—The new species differs from the morphologically closest Goodyera rhombodoides , G. thailandica and G. yamiana in smaller flowers, obliquely spatulate to narrowly obovate petals with truncate apices, cymbiform epichile with thin plicate margin, and prominent umbo at epichile center. Type :— VIETNAM . Dak Lak Province : M’Drak District , Chu Mu Mountain , February 2022 , Nguyen Van Canh AL 1545 ( holotype LE01169141 https://en.herbariumle.ru/?t=occ&id=141019, drawing LE01124095 https:// en.herbariumle.ru/?t=occ&id=168135) . Etymology :—The species name refers to the umbo-like callus on the lip epichile which distinguishes the new species from all its congeners. FIGURE 1. Paphiopedilum barbigerum var. barbigerum . A. Flowering plant in natural habitat. B & C. Flowers, front view. Specimen: L.T.Van, K.S.Nguyen AL 1605 . Myrmechis urceolata . D. Flattened flowering and fruiting plants. E & F. Apical part of floriferous stem with flowers. G & H. Flowers and flower buds, side and front view. Specimen: T.B.Vuong, N.T.Luan AL 1237 . Peristylus affinis . I. Flattened plant. J. Portion of inflorescence. K. Flower, side view. L. Detached flower, side view, with sepals removed. M. Detached flower, sagittal section. N. Detached flattened sepals, petals and lip. Specimen: S.K.Nguyen, T.H.Nguyen, M.H.Giang NSK 950 . Photos by L.T.Van & K.S.Nguyen (A–C), T.B.Vuong (D–H) and K.S.Nguyen (I–N); photo correction and design by L.Averyanov and T.Maisak. FIGURE 2. Goodyera umbonata . A. Flowering plant. B. Portion of inflorescence. C. Floral bract, adaxial side. D. Flattened median sepal and petals, adaxial side. E. Median sepal, adaxial side. F. Lateral sepals, adaxial side. G. Petals, adaxial side. H. Lip, view from above and from below. I. Lip, side view and sagittal section. J. Artificially flattened lip, adaxial view. K. Intact column, and column with anther removed. L. Column with anther, view from above. M. Column with anther removed, view from above. N. Column and stigma, view from below. O. Anther, side view. P. Anther and pollinarium, view from below. Drawn from the type specimen ( V.C.Nguyen AL 1545 ) by L.Averyanov and T.Maisak. Description:—Terrestrial herb with creeping rhizome and ascending leafy floriferous stem. Rhizome green, fleshy, (4)5–6(8) cm long, rooting at nodes. Floriferous stem (8)10–12(14) cm tall, glabrous, with (3)4–5(6) leaves distant in lower half. Leaves petiolate, glabrous; petiole and sheath (6)8–22(26) mm long, 1–2 mm wide; leaf blade uniformly grassy green adaxially, pale green abaxially, narrowly ovate, sometimes slightly oblique, gradually tapering to the apex, acute, (2.2)2.5–4.5(5) cm long, (1)1.2–1.5(1.7) cm wide. Peduncle erect, (6)7–8(9) cm long, finely papillose to shortly hairy, with 2–3 sterile bracts; bracts greenish, cuneate, acuminate, (5)6–15(16) mm long, 0.5–1.6 mm wide, shortly ciliate or fimbriate along margin, entirely glabrous; rachis finely hairy, usually with (10)12–16(18) laxly arranged flowers. Floral bracts light green, herbaceous, broadly ovate, concave, attenuate, finely serrulate or shortly fimbriate along margin, sparsely verruculose abaxially, (4)4.5–6(7) mm long, (0.8)1–1.5(1.6) mm wide, entirely glabrous. Pedicel and ovary grassy green, cylindrical, twisted, straight to strongly curved, (3.5)4–7.5(8) mm long, 0.8–1 mm in diameter, shortly sparsely papillulate to subglabrous. Flowers resupinate, hardly opening, (2.8)3–3.5(3.8) mm long. Sepals subequal, forward directed, narrowly ovate, cymbiform, slightly cucullate, obtuse, 1- nerved, (2.6)2.8–3(3.2) mm long, (1.4)1.6–1.8(2) mm wide, adaxially glabrous, abaxially sparsely papillulate to almost glabrous; lateral sepals slightly oblique. Petals obliquely spatulate to narrowly obovate, truncate to almost rounded at apex, 1-nerved, as long as sepals, 1.2–1.4 mm wide, glabrous, slightly eroded or almost entire at apex, tightly connivent in apical half with the median sepal forming together forward directed hood. Lip (3.2)3.4–3.8(4) mm long, 2–2.4 mm wide (being flattened), distinctly divided into hypochile and epichile; hypochile rather fleshy, concave, hemispheric, cup-like, 1.5–1.6 mm across, with numerous long thick multicellular hairs inside; epichile forward directed, broadly ovate, cymbiform, 1.5–1.7 mm long, 2.2–2.6 mm wide (being flattened), entire, with thin plicate margin, at base with 2 distinct papillulate callosities and in center with prominent umbo-like callus. Column (1.5)1.6–1.8(2) mm tall, with stout, shortly cylindrical base and 2 finger-like forward directed incurved rostellar arms 0.7–0.8 mm long, bearing anther distally and elliptic verruculose stigma proximally. Anther semi-globose, (1.2)1.4–1.6(1.7) mm long, with short triangular beak at front; pollinarium with very small, narrowly elliptic viscidium and numerous polyads arranged in two rows. Capsule suberect, fusiform, slightly attenuate at apex, 8–10 mm long, 2.5–3 mm in diameter, opening by 6 slits. Ecology and phenology :—Evergreen broad-leaved submontane forests on granite. Flowers in February. Distribution :—Endemic to Vietnam ( Dak Lak Province : M’Drak District, Chu Mu Mountain). Conservation status :—The species is known from a single location with several mature individuals observed. Pending comprehensive field studies in the area of its locus classicus , we estimate the conservation status of the species as Data Deficient (DD) according to the criteria proposed by the IUCN Standards and Petitions Committee (2023) . Notes :—In its habit and floral morphology, Goodyera umbonata is somewhat similar to its SE Asian congeners G. rhombodoides Averyanov (2007: 297) , G. thailandica Seidenfaden (1969: 109) and G. yamiana Fukuyama (1936: 18) . The new species differs from them in smaller flowers, obliquely spatulate to narrowly obovate petals truncate to almost rounded at apex, cymbiform epichile with thin plicate margin, and prominent umbo at epichile center. Goodyera umbonata represents an example of strict endemics of the mountainous area surrounding Langbian Plateau (a part of the so-called Central Highlands of Vietnam : Poyarkov et al. 2021 ), which is outlined in the biogeography of Eastern Indochina as the South Annamese Floristic Region ( Averyanov et al. 2003a ,b).