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      A new species of Rhododendron (Ericaceae) from Guizhou, China

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      PhytoKeys

      Pensoft Publishers

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          Abstract

          A new species of the Rhododendron (Ericaceae) in subgen. Tsutsusi sect. Tsutsusi from Puding county of Guizhou, China, is described and illustrated. The new species, R. pudingense X.Y. Dai, C.H. Yang & Y.P. Ma, is similar to R. myrsinifolium Ching ex Fang et M. Y. He and R. minutiflorum Hu, but it can be easily distinguished by its length and being pubescent on inner surface of corolla tube, sparse hairs below the middle of filament and the glabrous style.

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          Most cited references 6

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          Unusual patterns of hybridization involving a narrow endemic Rhododendron species (Ericaceae) in Yunnan, China.

          • One potential threat to rare species is genetic swamping caused by hybridization, but few studies have quantified this threat. Rhododendron cyanocarpum is a narrow endemic species that occurs sympatrically with potentially interfertile congeners throughout its range within Yunnan, China. We searched the entire distribution of R. cyanocarpum for hybrids and examined the patterns of hybridization to assess potential threat from hybridization. • In a comprehensive field survey, we detected only one instance of hybridization involving R. cyanocarpum, with R. delavayi, at Huadianba near Dali. Material of both species and putative hybrids was examined using morphology, chloroplast DNA, nuclear ribosomal DNA, and Bayesian analysis of AFLP profiles. • Of 10 putative hybrids, two were F(1)(')s and at least seven were F(2)(')s. Four backcrosses to R. delavayi were detected among material with R. delavayi-like morphology within the hybrid zone. Backcrosses to R. cyanocarpum were not detected. Therefore F(2)(')s outnumbered all other classes within the hybrid zone, a situation not previously confirmed for plants and extremely rare generally. Hybridization was asymmetrical, with R. delavayi as the maternal parent in all but one of the hybrids detected. • Although natural hybridization is common in Rhododendron, it is rare in R. cyanocarpum and is apparently not accompanied by backcrossing toward R. cyanocarpum. Hence, there is no immediate risk of genetic swamping, unless habitat disturbance increases and changes the patterns of hybridization. Our study is the first to report a plant hybrid zone dominated by F(2) hybrids. This pattern might contribute to species barrier maintenance.
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            Rhododendron longipedicellatum (Ericaceae), a new species from Southeastern Yunnan, China

            A new species of Rhododendron (Ericaceae) in sect. Vireya subsect. Pseudovireya from Malipo County, Southeast Yunnan, China, R. longipedicellatum, is described and illustrated. The new species is most similar to R. rushforthii but differs in its arrangement of leaves, the shape and color of the lamina, length of the petiole and the size of the calyx lobes. It also resembles R. trancongii and R. Datiandingense, but differs in its color and shape of the lamina, the leaf apex, lengths of the petiole, pedicel and stamens, and the indumentum of the ovary.
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              Discovery of two new populations of the rare endemic Rhododendron liboense in Guizhou, China

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                Author and article information

                Journal
                PhytoKeys
                PK
                Pensoft Publishers
                1314-2003
                1314-2011
                May 08 2020
                May 08 2020
                : 146
                : 53-59
                Article
                10.3897/phytokeys.146.51342
                © 2020

                http://creativecommons.org/licenses/by/4.0/

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