Research Article

1. —331—
Adinandra hongiaoensis (Theaceae), A New Species from
Lam Dong, Vietnam
Hoang Thanh Son
a,* and Luong Van Dung
b
a
Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Ha Noi, 10999 VIETNAM;
b
Biology Department, Dalat University, Dalat, 61999, VIETNAM
*Corresponding author: hoangsonfsiv@gmail.com
(Accepted on May 10 2014)
Adinandra hongiaoensis H. T. Son & L. V. Dung (Theaceae), a new species from Hon
Giao, Bidoup Nui Ba National Park, Lam Dong Province, is described and illustrated. It
is similar to Adinandra poilanei Gagnep, but differs from that by leaf blade size (35–45 ×
8–12 cm), cordate leaf base, shorter pedicel, petal pubescent abaxially.
Key words: Adinandra, Adinandra hongiaoensis, new species, Theaceae, Vietnam.
J. Jpn. Bot. 89: 331–334 (2014)
Jack (1822) established the genus Adinandra
with a single species A. dumosa from Sumatra
and Malay Islands. There are about 85 species
mainly distributed in Bangladesh, Cambodia,
China, India, Indonesia, Southern Japan, Laos,
Malaysia, Myanmar, New Guinea, Philippines,
Sri Lanka, Thailand, China and the African
tropical forest (Min & Bruce 2007). The genus
is characterized by sepals 5, persistent; petals 5,
imbricate; stamens from 15–60 in 1–5 whorls;
connate or distinct filaments, adnate to the base
of sepals; filiform anther trichomes, connecting
with an apiculum; ovary (2–)3–5-loculed; ovules
20–100 per locule; style l, simple or apically
3–5-lobed; fruit many-seeded, with a persistent
style (Humbert 1941, Min and Bruce 2007).
Eleven species of the genus Adinandra occur
in Vietnam, including: A. annamensis Gagn.,
A. dongnaiensis Gagn., A. caudata Gagn., A.
glischroloma Hand-Mazz., A. hainanensis Hay.,
A. integerrima T. And. ex Dyer, A. microcarpa
Gagn., A. millettii Benth. & Hook. f. ex Hance,
A. megaphylla Hu.; A. poilanei Gagn., and A.
rubropunctata Merr. & Chun. (Ho 1999, Nguyen
Tien Ban et al. 2003), of which A. megaphylla
Hu is listed in the Vietnam Red Book (2007).
During botanical expeditions (2006–2009)
in Hon Giao, Bidoup - Nui Ba National Park,
Lam Dong Province, specimens of one very
distinctive Adinandra species with the character
of leaves and fruits were collected at the altitude
of 1600 m a.s.l., which probably represented
Table 1. Morphological comparison between Adinandra hongiaoensis and
A. poilanei Gagnep.
A. hongiaoensis A. poilanei
Leaf blade size 35–45 × 8–12 cm 16–25 × 5–7.5 cm
Petiole length 0.2–05 cm 1 cm
Leaf blade base cordate cuneate
Pedicel length less than 1 cm 2–3 cm
Petals pubescent on back side glabrous on back side

2. 332 植物研究雑誌 第 89 巻 第 5 号 2014 年 10 月
Fig. 1. Adinandra hongiaoensis H. T. Son & L. V. Dung. A. Leafy branch. B. Leaf blade. C. Flower buds. D. Flower.
E. Calyx and style. F. Petal (back side view). G. Petal (front side view). H. Stamens. I. Fruits. K. 5 locules with
many seeds inside. L. Seeds.

3. October 2014 The Journal of Japanese Botany Vol. 89 No. 5 333
undescribed species. In October, 2009, more
specimens including leaves, fruits and flowers of
the same trees were collected. After examining
the specimens and comparing with the extant
species in Vietnam, we come to the conclusion
that the specimens collect from Hon Giao are
similar to Adinandra poilanei Gagn. (Gagnepain
1938) in certain characters and represents an
undescribed species. The main differences
between the new species and A. poilanei are
summarized in Table 1.
Adinandra hongiaoensis H. T. Son & L. V.
Dung, sp. nov. [Fig. 1]
Similissima Adinandrae poilanei Gagnep.,
sed quod per modum laminis magnis (35–45 ×
8–12 cm), foliis basi vulgo cordatis, pedicellis
brevioribus, foliis subtus pubescentibus differt.
Type: VIETNAM. Lam Dong Province,
Bidoup Nui Ba National Park, Hon Giao peak,
elevation 1600 m a.s.l; 16 October 2009, Hoang
Son HS09 (, VAFS [Vietnamese Academy of
Forest Science, Vietnam]– holotype; DLU [Da
Lat University, Vietnam]–isotype).
Evergreen, trees are up to 10 m tall, young
branches with dense gray hairs. Petiole is very
short, almost sessile, white at the base; leaves
are alternately arranged; leaf blade is oblong or
oblong-elliptic, with the length of 30–45 and
width of 8–12 cm, green above, light green
below, grayish-yellow hairy on the low surface,
smooth on the above surface, midvein abaxially
prominent with extended in the form of wings,
lateral veins inconspicuous, leaf base obtuse
or cordate, apex acuminate, serrated margins.
Flowers axillary, solitary or paired; peduncle
0.5–0.7 cm long, dense white hairs; bracts 2,
ovate, 0.8–1.0 × 0.7–0.8 cm, outside surface
with dense feathers, sepals ovate, 1.0–1.2 × 1.3–
1.7 cm, outside grayish brown sericeous, apex
slightly acute to sub-rounded; outer sepals thick,
margins reddish hairs; inner sepals membranous,
margins entire. Petals white, oblong to oblong-
elliptic, 2.2–2.5 × 1.6–1.7 cm, apex obtuse,
adaxial pubescent. Stamens numerous, in 2
whorls, 20–24 per whorl, 1.5–1.7 cm long;
filaments 0.3–0.4 cm long, dense hairs, adnate to
base of sepals; anthers linear, 0.2–0.3 cm long.
Ovary cone shaped, locules 5 and 18–45 ovules
per locule; styles 5 lobed, shallow, 0.4–0.6 cm
long. Fruit purplish black, globose, 2–2.2 cm in
diam., pubescent, many seeds per locule. Seeds
brown-black, semicircular, kidney shaped, size
mesurement, back crease (not smooth.)
Distribution and habitat: The new species
Adinandra hongiaoensis is endemic to Bidoup –
Nui Ba National Park, in the southern highlands
of Vietnam, between 1600–2000 m a.s.l.
associated species include: Fokienia hodginsii
Henry & Tomas (Cupressaceae), Podocarpus
imbricatus Blume, Podocarpus neriifolius D.
Don (Podocarpaceae), Quercus macrocalyx
Hick. & Cam. Quercus langbianensis Hick. &
Cam. (Fagaceae) and Camellia sp. (Theaceae).
Etymology: The specific epithet hongiaoensis
derived from the type locality ‘Bidoup–Nui Ba
National Park’.
The authors would like to thank the
Management Board of Bidoup-Nui Ba National
Park for their kind help in locating field surveys.
We would like to thank Dr. Nguyen Hoang
Nghia (Vietnam Academy of Forest Sciences)
and Dr. Tran Van Tien (Dalat University) for
critical reading earlier version of the manuscript.
The authors are also grateful to Mrs. Luong Thi
Minh Hoa for making illustration.
References
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Gagnepain F. 1938. Adinandra. In: Lecomte P. H. (ed.),
Supplément a La Flore Générale de L’Indo-chine 1:
290. Gallice, Paris.
Humbert H. 1941. Notulae Systematicae. Tome X,
Fasicules 1 et 2: 112–116. Paris.
Ho P. H. 1999. Cay Co Vietnam (An Illustrated Flora of
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Chi Minh (in Vietnamese).
Jack W. 1822. Adinandra. Malayan Miscellanies 2(7): 49.
Ministry of Science and Technology. Vietnam Red Data
Book. Part II - Plants: 342. Ministry of Natural

4. 334 植物研究雑誌 第 89 巻 第 5 号 2014 年 10 月
H. T. Sona
，L. V. Dungb
：ベトナム Lam Dong 産の 1
新種，Adinandra hongiaoensis（ツバキ科）
ツ バ キ 科 の 1 新 種 Adinandra hongiaoensis H. T.
Son & L. V. Dung をベトナム・Lam Dong 地区の Hon
Giao, Bidoup Nui Ba 国立公園から記載した．本種は A.
poilanei Gagnep. に似るが，葉身が長さ 35–45 cm，幅
8–12 cm とより大きく，基部が心形で，花柄が短く，
花弁の背面が有毛である点で区別できる．
（a
ベトナム・Silviculture Research Institute，
b
ベトナム・Dalat University Biology Department）
Sciences and Technology, Ha Noi.
Min T. L. and Bruce B. B. 2007. Theaceae. In: Wu Z. Y.,
Raven P. H. and Hong D. Y. (eds.), Flora of China
12: 435–443. Science Press, Beijing and Missouri
Botanical Garden Press, St. Louis.
Nguyen T. B. (ed.) 2003. A List of All Plant Species in
Vietnam. 2: 341–343. Agriculture Publish House, Ha
Noi.