Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo (Gesneriaceae), a new species from South China Author Wen, Fang Guangxi Key Laboratory of Functional Phytochemicals Research, Guilin Botanic Garden, Guangxi / Institute of Botany, Yanshan District, Guilin, CN- 541006, Guangxi, China. wenfang760608@139.com Author Wei, Yi-Gang Guangxi Key Laboratory of Functional Phytochemicals Research, Guilin Botanic Garden, Guangxi / Institute of Botany, Yanshan District, Guilin, CN- 541006, Guangxi, China. text Candollea 2014 2014-07-01 69 1 9 19 journal article 3107 10.15553/c2014v691a2 d9ca8942-545a-47a2-ab7b-ff599c44434b 2235-3658 5761846 Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo , spec. nova ( Fig. 1-2 ). Typus : CHINA . Guangdong : Yinpingzui nature reserve in Dongguan city, grows in crevices of granite cliffs under subtropical evergreen broad-leaved forests and shrubs , ca. 276 m , 22º53’N , 114º14’E , 3.VIII.2009 , Fang Wen 100803 ( holo- : IBK ! ; iso- : IBK !) . A Primulina eburnea , P. dryas , P. napoensis et P. spec. nov. differt bractis rhombiformis, sub angulo ca. 45 ° abientibus, calyx lobis late lanceolatis, corolla 4.5-5.5 cm longa, filamentis ca. 20 mm longis, pistillo 3.5-4.2 cm longo, dense villoso, eglandulato. Perennial herbs. Short somewhat succulent stems , 1-1.5 cm long, 1.1-1.2 cm in diameter, internodes indistinct. Leaves 6-10, basal or in whorls of three arranged at the top of stem; leaf lamina fleshly chartaceous, ovate-elliptic, 7-15 X 6-10.5 cm , base slightly oblique or symmetrical, broadly cuneate to cordate, margin irregularly obtuse-serrate, apex acute, sparsely strigose on both sides, 3-4-nerved on each side; petiole compressed, 2.5-6.5 X 0.7-1 cm , pubescent and sparsely strigose. Cymes axillary, 3-5 or more, 3-5-flowered or more; peduncle 10.5-16 cm long, 1.7-2.3 mm in diameter, densely erectly long pubescent; bracts 2, opposite, rhombic, 2.1-4.5 X 1.2-1.6 cm , pubescent outside, nearly glabrous inside, positioned at ca. 45° angle, margin entire, apex acute; pedicel 8- 17.5 mm long, densely long pubescent. Pedicel 1.2-2.2 cm , puberulent and glandular puberulent. Calyx 5-parted to the base, lobes equal, broadly lanceolate, ca. 5 X 1.8-2.2 mm , pubescent outside, nearly glabrous inside. Corolla 4.5-5.5 cm long, orifice 9- 1.1 mm in diameter, purple, lilac or fuchsia, the colour of the throat pale purple with two yellowish brown stripes, tubular, the upper part of the interior of the corolla with two dark brown stripes; interior yellowish brown, tube swollen, outer side densely erect-pubescent, inner glabrous; limb distinctly 2-lipped, adaxial lip 2-parted to the middle, lobe ca. 1 cm long, triangular; abaxial lip 3-parted to the base, lobes oblong, 1.2-1.3 cm long. Stamens 2, adnate to ca. 2.3 cm above the corolla base; anthers reniform, ca. 5 mm long, slightly constricted at the middle, glabrous; filaments ca. 2 cm long, pubescent, geniculate at the middle; staminodes 2 with broad base, gradually narrowed to apex, curved in upper part, apex capitate, 8-9 mm long, glabrous; disc annular, brown, ca. 1 mm high. Pistil 3.5-4.2 cm long, densely pubescent, eglandular; ovary linear; style 4-5 mm long. Stigma 2-lobed, 2.5-3 mm long. Capsule and seeds not seen. Etymology. – The specific epithet is derived from the type locality, Dongguan City, Guangdong. Phenology . – Flowering in August. Fig. 1. – Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo. A. Habit ; B. Opened corolla with stamens and staminodes; C. One calyx lobe; D. Calyx and pistil. [Fang Wen 100803, IBK] [Drawing: Wen-Hong Lin] Fig. 2. – Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo. A. Natural hillside habitat; B. Natural habitat; C. Plant in natural habitat; D. Plant with cymes and flowers in cultivation; E. Frontal view of cyme and flowers; F. Anatomical dissections of the cyme, showing bracts, pistil and opened corolla; G. Lateral view of flower, calyx and pistil; H. daxial and abaxial views of calyx lobes. [ D-H: Fang Wen 100803, IBK] [Photos: A-C: Fang Wen; D-E: Shi-Liang Mo; F-H: Wen-Hong Lin] Fig. 3. – Distribution of Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo ( H ), P. eburnea (Hance) Y. Z. Wang (in the elliptical area), P. dryas (Dunn) Mich. Möller & A. Weber ( s ), P. napoensis (Z. Y. Li) Mich. Möller &. Weber ( F ) and P. spec. nov. ( u ) in China. Distribution and habitat. – Primulina dongguanica only grows on a mountainside in the Yinpingzui nature reserve, Guangdong (Dongguan) of China ( Fig. 3 ), at an altitude of 276 m . All plants are growing in damp and dark crevices of granite cliffs near a stream. Conservation. – The only known population is located near a road, and human activities can potentially jeopardize the existence of this species. In WEI & al. (2010) , we had assigned the IUCN Category EN B2b (ii, iii, iv). Recently, in November 2012 , we revisited the type locality again, and found to our surprise the site destroyed due to road building work. Less than 50 individuals only survived. According to IUCN red list categories ( IUCN, 2001: 16-18 ; PULLIN, 2004 ), we therefore appraised P. dongguanica as Critically Endangered, CR B2ab (i, iii, v) + C2a (ii). Morphological relationships. – Primulina dongguanica F. Wen, Y. G. Wei & R. Q. Luo is morphologically similar to P. eburnea (Hance) Y. Z. Wang ( Fig. 4 ), P. dryas (Dunn) Mich. Möller & A. Weber ( Fig. 5 A-D), P. napoensis (Z. Y. Li) Mich. Möller & A. Weber ( Fig. 5 E-H) and P. spec. nov. ( Fig. 6 ), but differs from above-mentioned species in bract morphology and position, calyx lobes shape, filament and pistil length and indumentum, and flowering time ( Table 1 ).