Generic status of Winitia (Annonaceae, Miliuseae) reaffirmed by molecular phylogenetic analysis, including a new species and a new combination from Thailand Author Chaowasku, Tanawat Herbarium, Division of Plant Science and Technology, Faculty of Science, Chiang Mai University, 239 Huay Kaew Rd., Chiang Mai 50200, Thailand. & Research Center in Bioresources for Agriculture, Industry, and Medicine, Chiang Mai University, 239 Huay Kaew Rd., Chiang Mai 50200, Thailand. & Corresponding author: tanawat. chaowasku @ cmu. ac. th tanawat.chaowasku@cmu.ac.th Author Aongyong, Kithisak Sichon, Nakhon Si Thammarat 80120, Thailand. & Email: siamocananga @ hotmail. com siamocananga@hotmail.com Author Damthongdee, Anissara Herbarium, Division of Plant Science and Technology, Faculty of Science, Chiang Mai University, 239 Huay Kaew Rd., Chiang Mai 50200, Thailand. & Email: aniss. damthongdee @ gmail. com aniss.damthongdee@gmail.com Author Jongsook, Hathaichanok Herbarium, Division of Plant Science and Technology, Faculty of Science, Chiang Mai University, 239 Huay Kaew Rd., Chiang Mai 50200, Thailand. & Email: hathaichanok _ j @ outlook. com hathaichanok_j@outlook.com Author Johnson, David M. Department of Botany and Microbiology, Ohio Wesleyan University, Delaware, Ohio 43015, USA. & Email: dmjohnso @ owu. edu dmjohnso@owu.edu text European Journal of Taxonomy 2020 2020-06-04 659 1 23 journal article 21745 10.5852/ejt.2020.659 2e0a081e-74fb-486b-9bac-9a26b77b9441 2118-9773 3877044 Winitia thailandana Chaowasku & Aongyong sp. nov. urn:lsid:ipni.org:names:77209778-1 Figs 4–6 Diagnosis Morphologically similar to Winitia expansa , differs by having a non-glaucous appearance on the petal adaxial surface (glaucous in W. expansa ) and shallow pits on the adaxial surface of the inner petals (no pitted structures in W. expansa ). Moreover, its inflorescences are mostly clustered on large roots and at the unswollen base of trunks, whereas the inflorescences of W. expansa are mostly clustered at the swollen base of trunks. Etymology Named after Thailand , a country where this species is endemic. Type material Holotype THAILAND • Surat Thani Prov. , Phanom Distr. ; 8 May 2017 ; fl; Aongyong 9 ; holotype : CMUB ; isotypes: G , P . Paratypes THAILAND • Surat Thani Province , Phanom District ; fl; Chaowasku 51 ; CMUB • Khlong Phanom National Park ; fl; Gardner & Sidisunthorn ST0817 ; L . Description Medium-sized trees 12–14 m tall, dbh ca 27 cm . Young twigs glabrous. Petiole 6–8 mm long, grooved on upper surface, glabrous on both surfaces; leaf blade elliptic to slightly ovate, 13–17.8 × 3.7–5.8 cm , glabrous on both surfaces, in young leaves numerous black dots present on lower surface, base broadly cuneate to obtuse, apex acute-acuminate to acuminate; midrib raised and glabrous on both surfaces, in young leaves numerous black dots present on lower surface; secondary veins 8–10 per side, rather prominent on lower surface and forming loops, angle with midrib 50°–60° (at middle part of leaf blade). Flowers fasciculate, mostly clustered on large roots and at unswollen base of trunks, up to 3 flowers per fascicle, possibly unisexual [only male flowers found]; peduncle when present inconspicuous; pedicel 7–15 mm long, appressed-puberulous, bracts 2(–3), triangular, placed at base, sometimes a bit higher for upper one. Sepals basally connate, triangular-ovate to broadly triangular-ovate, 4.5–5.1 × 3–5 mm , outside appressed-puberulous, inside and margin glabrous. Outer petals ovate to broadly ovate, 10–11 × 9–10 mm , indumentum similar to sepals, outside with scattered warts, inside non-glaucous, apex between acute and obtuse; inner petals elliptic, 9–10 × 6 mm , glabrous on both sides and margin, inside non-glaucous and with shallow pits, apex obtuse to rounded. Torus elongated hemispherical in male flowers, glabrous. Stamens 32–39 per male flower, 1.8–2 mm long, tightly packed, each not bending inward, connective apex ± truncate, not covering thecae; female flowers not found. Monocarps unknown. Fig. 4. Flowers and floral organs of Winitia thailandana Chaowasku & Aongyong sp. nov. A–B . Flower. C . Flower with petals removed. D . Stamen, abaxial (above) and adaxial (below) sides. E . Back side of flower, showing sepals (abaxial side). A, B from Gardner & Sidisunthorn ST0817 (L), photographs by S. Gardner; C–E from Aongyong 9 (CMUB). Fig. 5. Holotype of Winitia thailandana Chaowasku & Aongyong sp. nov. at CMUB. Distribution, habitat, and phenology Surat Thani Province , Phanom District ( Fig. 6 ); occurs in evergreen forests among rugged limestone outcrops; at an elevation of ca 400 m ; flowering material collected in May and June. Field notes Flowers orange-pink. Notes The new species is so far known only from Phanom District. We observed only three individuals, which occur among limestone outcrops beside a trail surrounded by a rubber tree plantation. In Khlong Phanom National Park where this species has also been reported ( Gardner et al. 2015 ) less than ten individuals were found (pers. comm., S. Gardner). Based on our observations and estimations, we believe at least the category “endangered: EN D” ( IUCN 2012 ) is applicable. Fig. 6. Distribution of Winitia in Thailand. Winitia expansa Chaowasku (■), Winitia longipes (Craib) Chaowasku & Aongyong comb. nov. (●), and Winitia thailandana Chaowasku & Aongyong sp. nov. (▲). Key to genera in the sageraeoid clade 1. Plants bisexual or monoecious. Leaf midrib sunken on adaxial side, leaf venation (especially secondary veins) generally indistinct .............................................. Sageraea Dalzell ( Dalzell 1851 ) – Plants monoecious. Leaf midrib raised on adaxial side, leaf venation (especially secondary veins) distinct ............................................................................................................................................... 2 2. Flowers dimorphic (in the same individual male flowers smaller with shorter pedicels, female flowers larger with longer pedicels); male and female flowers allocated spatially differently (male flowers ramiflorous, female flowers cauliflorous); petals greenish yellow to cream at maturity, each stigma bilobed (± heart-shaped), torus conical-cylindrical to cylindrical in male flowers; monocarps light brown at maturity ................ Stelechocarpus Hook. f. & Thomson ( Hooker & Thomson 1855 ) – Flowers monomorphic; male and female flowers intermixed and clustered along trunks, at swollen or unswollen base of trunks, and/or on large roots; petals ± rose-colored at maturity, each stigma with multiple (Ż 5) columnar lobes, torus ± hemispherical in male flowers; monocarps ± blackish brown at maturity ........................................................ Winitia Chaowasku ( Chaowasku et al. 2013 )