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A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS
A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS
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A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS
A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS

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A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS
A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS
Journal Article

A TAXONOMIC REVISION OF TAXA IN STYRAX SERIES CYRTA (STYRACACEAE) WITH VALVATE COROLLAS

2018
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Overview
Several taxonomic treatments of Styrax (Styracaceae) exist in regional floras of Asia, but the Asian species of the genus have not been comprehensively revised since 1907. A treatment of the Asian taxa of S. series Cyrta with imbricate floral aestivation was accomplished in 2003. To complete the taxonomic revision of S. series Cyrta, we conducted a taxonomic revision of the species of the series with valvate aestivation of the corolla lobes. Our revision comprises 11 species with a combined distribution from eastern India through southern China and Malesia, Melanesia, and Micronesia, although the group is absent from the Philippines. We resurrected S. bracteolatus, S. rubifolius, and S. warburgii as species to be recognized, and we corrected the misapplication of S. finlaysonianus, previously used for a species in S. series Benzoin. Styrax finlaysonianus and S. warburgii are segregated from the broader concept of S. agrestis recognized in prior treatments. The circumscriptions of the heretofore poorly delimited species S. confusus, S. faberi, and S. fortunei are clarified and their possible introgressants discussed. We observed unique combinations of characters in some problematic specimens whose taxonomic status remains unresolved because only single specimens with either flowers or fruits were available; at least some of these may represent undescribed species. Lectotypes are designated for Cyrta agrestis, S. argyi, S. bracteolatus, S. calvescens, S. casearifolius, S. confusus var. microphyllus, S. dasyanthus, S. dasyanthus var. cinerascens, S. faberi, S. finlaysonianus, S. formosanus, S. fortunei, S. fukienensis, S. henryi, S. henryi var. microcalyx, S. iopilinus, S. philadelphoides, S. rostratus, S. rubifolius, S. serrulatus var. agrestis, and S. virgatus. A neotype is designated for S. warburgii. Keys, descriptions, distribution maps, and conservation assessments are provided for all species. Styrax agrestis, S. bracteolatus, and S. rubifolius are rare endemics of conservation concern, with highly restricted distributions. Existen varios tratamientos taxonómicos de Styrax (Styracaceae) en floras regionales de Asia, pero las especies asiáticas del género no han sido revisadas en profundidad desde 1907. Se realizó un tratamiento de los taxa asiáticos de S. series Cyrta con estivación imbricada en 2003. Para completar la revisión taxonómica de S. series Cyrta, hicimos una revisión taxonómica de las especies de la serie con estivación valvar de la corola. Nuestra revisión comprende 11 especies con una distribución combinada desde el este de India hasta el sur de China Malasia, Melanesia y Micronesia, aunque el grupo está ausente de Filipinas. Recuperamos S. bracteolatus, S. rubifolius, y S. warburgii como especies reconocidas, y corregimos la mala aplicación de S. finlaysonianus, previamente usad para una especie en S. series Benzoin. Styrax finlaysonianus y S. warburgii son segregadas del amplio concepto de S. agrestis reconocido en tratamientos anteriores. Se clarifican las circunscripciones de las hasta ahora pobremente delimitadas especies S. confusus, S. faberi, y S. fortunei y se discuten sus posibles introgresores. Observamos combinaciones únicas de caracteres en algunos especímenes problemáticos cuyo estatus taxonómico queda sin resolver porque solo estuvieron disponibles especímenes únicos en los que estaban disponibles las flores o los frutos; al menos algunos de estos pueden representar especies no descritas. Se designan lectotipos par Cyrta agrestis, S. argyi, S. bracteolatus, S. calvescens, S. casearifolius, S. confusus var. microphyllus, S. dasyanthus, S. dasyanthus var. cinerascens, S. faberi, S. finlaysonianus, S. formosanus, S. fortunei, S. fukienensis, S. henryi, S. henryi var. microcalyx, S. iopilinus, S. philadelphoides, S. rostratus, S. rubifolius, S. serrulatusy var. agrestis, y S. virgatus. Se designa un neotipo para S. warburgii. Se aportan claves, descripciones, mapas de distribución, y evaluaciones de conservación para todas las especies. Styrax agrestis, S. bracteolatus, y S. rubifolius son endemismos raros de preocupación por su conservación, con distribuciones altamente restringidas.
Publisher
Botanical Research Institute of Texas
Subject

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