Nordic Journal of Botany 31: 676–679, 2013 doi: 10.1111/j.1756-1051.2012.01763.x, © 2013 The Authors Nordic Journal of Botany © 2013 Nordic Society Oikos Subject Editor: John Parnell Accepted 28 August 2012 Ardisia banaensis and A sadirioides spp nov (Myrsinaceae) from Vietnam Ke Loc Phan, Pham Van The and Chi-Ming Hu L K Phan, Faculty of Biology, Hanoi Univ of Science, Vietnam National Univ., Hanoi, Vietnam – P V The, Dept of Plant Resources, Inst of Ecology and Biological Resources, Hanoi, Vietnam – C.-M Hu (huqm@scbg.ac.cn), South China Botanical Garden, the Chinese Academy of Sciences, CN-510650 Guangzhou, Guangdong, PR China Two new species of Ardisia (Myrsinaceae), A banaensis C M Hu & L K Phan and A sadirioides C M Hu & L K Phan, from Vietnam are described and illustrated Their distribution, habitat, phenology and closely related species are discussed Ardisia is the largest genus in Myrsinaceae comprising about 400–500 pantropical species (Chen and Pipoly 1996), of which more than 300 are distributed in Asia (Hu 1999) According to Hu and Vidal (2004), Indochina is one of the main centers of species diversity for Ardisia with 104 species, of which 98 occur in Vietnam During recent field work in northern and central Vietnam, numerous specimens of Ardisia were collected During the course of identifying these collections based on herbarium vouchers, including types from HN, IBSC, and photographs of the types from L, NY and P, unique specimens were discovered This leads to the proposal of two new species described and discussed below Ardisia banaensis C M Hu & L K Phan sp nov (Fig 1) Ardisiae polycephalae Wall ex A DC simillima, a qua imprimis inflorescentiis corymboso-paniculatis, floribus in ramulis ultimis subumbellatim dispositis, lobis calycis oblongo-ellipticis non tegentibus differt Type: Vietnam Da Nang City: Hoa Vang District, Ba Na-Nui Chua protected area, around point, 15°59′52″N, 107°59′04″E, 1200–1500 m a.s.l., 15 May 2011 CPC 3279 (holotype: HN, isotypes: IBSC, LE, VNM) Etymology Bana is a well-known mountainous district in central Vietnam with a large area of well protected primary evergreen submontane forests and high plant diversity The new species is named for the locality in which it occurs 676 Description Small tree, 2–4 m high, glabrous throughout; branches terete Leaves alternate, Ϯ crowded towards apex of branchlets; petioles 1.0–1.5 cm long, canaliculate; leaf blade obovate–elliptic, 9–16 ϫ 3–6 cm, attenuate at base, broadly acute at apex, entire, chartaceous; punctations numerous, black, scattered, most distinct on young leaves; lateral nerves in 12 to 18 (20) pairs, with short intermediaters, angle to the midrib about 50°, arcuate upward, anastomosing at margin, reticulation of veins prominent beneath Inflorescence lateral, corymbose-paniculate, branched once Peduncle 4.0–6.5 cm long, slightly compressed; branches 1.5–2.5 cm long, each bearing to subumbellate flowers Pedicels 8–16 mm long Calyx ca mm long; tube ca mm long; lobes ca mm wide, rounded at apex, sparsely and minutely punctuate Corolla purplish, ca cm long; tube ca 1.5 mm long; lobes broadly ovate-elliptic, ϫ mm, acute at apex, sparsely punctuate Anthers narrowly ovate, 3.5–4.0 mm long, acute at apex, opening by lateral slits; filament very short, ca 1.5 mm Ovary ovoid, ca 1.5 mm in diameter, narrowed upwards to the style; style ca mm long; ovules numerous, in series on placenta Distribution, habitat and phenology Ardisia banaensis is known only from the type locality, on the mountain slopes of the Ba Na-Nui Chua protected area (around point 15°59′52″N, 107°59′04″E), Hoa Vang District, Da Nang City, Vietnam It occurs scattered in heavily disturbed closed evergreen primary and secondary seasonal tropical broad-leaved submontane forest and scrub, on very steep mountain slopes with granite mother rocks at 900–1500 m a.s.l It was found flowering in May Figure Ardisia banaensis C M Hu & L K Phan sp nov (A) flowering branch, (B) flower, with corolla and stamens removed, (C) corolla opened showing stamens, (D) corolla-lobe and stamen, (E) pistil Drawn by Liu Yunxiao from the isotype in IBSC Similar species Ardisia banaensis belongs to Ardisia subgen Tinus which is characterised by lateral inflorescences and imbricate calyx-lobes The closest affinity of the new species is with A polycephala Wall ex A DC., but can be easily distinguished from the later by its corymbiform paniculate inflorescence and the oblong-elliptic and scarcely imbricate calyx-lobes, so it is somewhat abnormal in the subgenus Tinus Ardisia sadirioides C M Hu & L K Phan sp nov (Fig 2) Ardisiae applanatae C M Hu & J E Vidal subsimilis, sed ab ea inflorescentiis terminalibus, subsessilibus, floribus minoribus, ovulis 6–8 uniseriatis differt Type: Vietnam Quang Binh Province: Tuyen Hoa District, Lam Hoa municipality, near Ca Tang bridge crossing 677 Figure Ardisia sadirioides C M Hu & L K Phan sp nov (A) flowering branch, (B) flower bud, (C) corolla opened showing stamens, (D) stamens showing dorsal and ventral sides, (E) pistil Drawn by Liu Yunxiao from the isotype in IBSC upstream Gianh River, around point, 17°57′30″N, 1054°8′43″E, ca 60 m a.s.l., May 2012 PVT 582 (holotype: HN, isotypes: IBSC, LE, VNM) Etymology The specific epithet sadirioides refers to the genus Sadiria of Myrsinaceae, which the new species superficially resembles by having very short and subsessile inflorescence 678 Description Small shrub, ca 0.5–1.5 m high; branchlets subterete, Ϯ dilated at insertion, densely ferrugineous pubescent when young Leaves alternate, Ϯ crowded towards apex of branchlets; petioles 6–10 mm long, canaliculate; leaf blade narrowly elliptic, 8–13 ϫ 1.6–3.5 cm, attenuate at base, acuminate at apex, entire, firmly chartaceous, with adaxial surface glabrous and abaxial surface covered with minute, gland-like rust-coloured scales; glandular dots many, scattered, inconspicuous on both surfaces; lateral nerves in 14 to18 pairs, with short intermediaters, angle to the midrib about 45°, arcuate upward, anastomosing at margin, reticulation of veinlets inconspicuous Inflorescence terminal, subsessile; axis 5–10 mm long, to times branched, densely ferrugineous pubescent; branches 8–15 (20) mm long, each bearing to umbellate flowers and often with secondary branches equal to the pedicels near the apex Pedicels 5–10 mm long Calyx ca 1.5 mm long; lobes triangular, acute at apex, minutely ciliate Corolla almost white, ca mm long, split to near the base; lobes ovate, ca 1.5 mm wide, acute at apex Anthers ovate–lanceolate, ca mm long, apiculate, opening by lateral slits; filament very short Ovary ovoid, ca 0.5 mm in diameter; style ca mm long; ovules to 8, in one series on the placenta Distribution, habitat and phenology Ardisia sadirioides is known only from the type locality on rocky places along a river valley composed of stratified soft shale limestone near Ca Tang bridge (around point 17°57′31″N, 105°48′43″E), Lam Hoa Commune, Tuyen Hoa District, Quang Binh Province, Vietnam It occurs scattered in heavily disturbed closed evergreen primary and secondary seasonal tropical broad-leaved lowland forest and scrub at ca 60 m a.s.l It was found flowering in May Similar species Ardisia sadirioides belongs to Ardisia subgen Akosmos and resembles A applanata C M Hu & J E Vidal in aspect but is easily distinguished by its subterminal inflorescences, the smaller flowers and the fewer ovules arranged in one row on the placenta Additional specimens examined (paratypes) Vietnam Quang Binh Province: Tuyen Hoa District, Lam Hoa Commune, near Ca Tang bridge crossing upstream Gianh River, around point 17°57′31″N, 105°48′43″E, ca 60 m a.s.l., May 2011 CPC 2668 (HN, IBSC, LE, VNM) Acknowledgements – Authors cordially thank Dr Nguyen Tien Hiep, Director of The Center for Plant Conservation (CPC) and his staff members for organizing our expeditions Field work, results of which are presented in this publication, were supported from the investigation programs of the USA National Geographic Society (no 8418-08 to Prof Leonid Averyanov) and of the National Foundation for Science and Technology Development, Vietnam (no 106.11.20.09 to Prof Phan Ke Loc) Thanks also to Ms Liu Yun-Xiao (IBSC) for inking the line drawings References Chen, J and Pipoly, J J 1996 Myrsinaceae – In: Wu, Z Y and Raven, P H (eds), Flora of China 15 Science Press, Miss Bot Gard Press, pp 10–29 Hu, C M 1999 New synonyms and combinations in Asiatic Ardisia (Myrsinaceae) – Blumea 44: 391–406 Hu, C M and Vidal, J E 2004 Myrsinaceae – In: Morat, A (ed.), Flore du Cambodge, du Laos et du Vietnam Vol 32 Mus Natl Hist Nat., pp 9–152 679 ... distinguished from the later by its corymbiform paniculate inflorescence and the oblong-elliptic and scarcely imbricate calyx-lobes, so it is somewhat abnormal in the subgenus Tinus Ardisia sadirioides. .. Drawn by Liu Yunxiao from the isotype in IBSC Similar species Ardisia banaensis belongs to Ardisia subgen Tinus which is characterised by lateral inflorescences and imbricate calyx-lobes The closest... 6–10 mm long, canaliculate; leaf blade narrowly elliptic, 8–13 ϫ 1.6–3.5 cm, attenuate at base, acuminate at apex, entire, firmly chartaceous, with adaxial surface glabrous and abaxial surface covered