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.. Leaves alternate, crowded towards
Trang 1Ardisia 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 Th e, 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 Th eir 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
fi eld work in northern and central Vietnam, numerous
specimens of Ardisia were collected During the course
of identifying these collections based on herbarium
vouch-ers, including types from HN, IBSC, and photographs
of the types from L, NY and P, 3 unique specimens were
discovered Th is 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
impri-mis infl orescentiis corymboso-paniculatis, fl oribus in ramulis
ultimis subumbellatim dispositis, lobis calycis oblongo-ellipticis
non tegentibus diff ert
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
ever-green submontane forests and high plant diversity Th e
new species is named for the locality in which it occurs
Description
Small tree, 2 – 4 m high, glabrous throughout; branches terete Leaves alternate, crowded towards apex of branch-lets; petioles 1.0 – 1.5 cm long, canaliculate; leaf blade obovate – elliptic, 9 – 16 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 Infl ore-scence lateral, corymbose-paniculate, branched once Peduncle 4.0 – 6.5 cm long, slightly compressed; branches 1.5 – 2.5 cm long, each bearing 3 to 4 subumbellate fl owers Pedicels 8 – 16 mm long Calyx ca 5 mm long; tube ca 1 mm long; lobes ca 3 mm wide, rounded at apex, sparsely and minutely punctuate Corolla purplish, ca 1 cm long; tube
ca 1.5 mm long; lobes broadly ovate-elliptic, 9 6 mm, acute at apex, sparsely punctuate Anthers narrowly ovate, 3.5 – 4.0 mm long, acute at apex, opening by lateral slits;
fi lament very short, ca 1.5 mm Ovary ovoid, ca 1.5 mm in diameter, narrowed upwards to the style; style ca 7 mm long; ovules numerous, in 3 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 fl owering in May
Nordic Journal of Botany 31: 676–679, 2013
doi: 10.1111/j.1756-1051.2012.01763.x,
© 2013 Th e Authors Nordic Journal of Botany © 2013 Nordic Society Oikos
Subject Editor: John Parnell Accepted 28 August 2012
Trang 2Figure 1 Ardisia banaensis C M Hu & L K Phan sp nov (A) fl owering branch, (B) fl ower, 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 infl orescences and imbricate
calyx-lobes Th e closest affi nity of the new species is with
A polycephala Wall ex A DC., but can be easily
distin-guished from the later by its corymbiform paniculate infl
o-rescence 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 infl orescentiis terminalibus, subsessilibus, fl oribus minoribus, ovulis 6 – 8 uniseriatis diff ert
Type : Vietnam Quang Binh Province: Tuyen Hoa District,
Lam Hoa municipality, near Ca Tang bridge crossing
Trang 3Figure 2 Ardisia sadirioides C M Hu & L K Phan sp nov (A) fl owering branch, (B) fl ower 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., 2 May 2012 PVT 582
(holotype: HN, isotypes: IBSC, LE, VNM)
Etymology
Th e specifi c epithet sadirioides refers to the genus Sadiria
of Myrsinaceae, which the new species superfi cially
resem-bles by having very short and subsessile infl orescence
Description
Small shrub, ca 0.5 – 1.5 m high; branchlets subterete,
dilated at insertion, densely ferrugineous pubescent when young Leaves alternate, crowded towards apex of branchlets; petioles 6 – 10 mm long, canaliculate; leaf blade narrowly elliptic, 8 – 13 1.6 – 3.5 cm, attenuate at base, acuminate at apex, entire, fi rmly chartaceous, with adaxial surface glabrous and abaxial surface covered with
Trang 4but is easily distinguished by its subterminal infl orescences, the smaller fl owers 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., 2 May 2011 CPC 2668 (HN, IBSC,
LE, VNM)
Acknowledgements – Authors cordially thank Dr Nguyen Tien Hiep,
Director of Th e 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) Th anks 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
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 Infl orescence
terminal, subsessile; axis 5 – 10 mm long, 1 to 2 times
branched, densely ferrugineous pubescent; branches 8 – 15
(20) mm long, each bearing 3 to 5 umbellate fl owers 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 4 mm long, split to near the base; lobes ovate, ca
1.5 mm wide, acute at apex Anthers ovate – lanceolate, ca 3
mm long, apiculate, opening by lateral slits; fi lament very
short Ovary ovoid, ca 0.5 mm in diameter; style ca 2 mm
long; ovules 6 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 stratifi ed 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 fl owering in May
Similar species
Ardisia sadirioides belongs to Ardisia subgen Akosmos and
resembles A applanata C M Hu & J E Vidal in aspect