Chi Edgeworthia là một chi nhỏ thuộc họ Trầm (Thymelaeaceae), bao gồm 5 loài, phân bố ở châu Á (Bhutan, Trung Quốc, Ấn Độ, Nhật Bản, Myanmar, Nepal, Việt Nam). Trong số 5 loài thuộc c[r]
Trang 1Edgeworthia tomentosa (Thunb.) Nakai (Thymelaeaceae): A NEWLY RECORDED
SPECIES FOR THE FLORA OF VIETNAM
Nguyen Thi Van 1 , Tran Duc Binh 2 , Sy Danh Thuong 3 , Bui Hong Quang 2 *
1
Bacgiang Agriculture and Forestry University,
2 Institite of Ecology and Biological Resources - Vietnam Academy of Science and Technology,
3 TNU - University of Education
SUMMARY
Thymelaeaceae has 48 genera and ca 650 species, widely distributed in both hemispheres
Edgeworthia is a small genus of Thymelaeaceae, about 5 species, only distribution in Asia
(Bhutan, China, India, Japan, Myanmar, Nepal, Vietnam) Among 5 species, there are 3 endemic
species in China In Vietnam, this genus has only 1 species - E gardneri (Wall.) Meisn., only distribution in Khanh Hoa In this paper, E tomentosa (Thunb.) Nakai., a new record of
Thymelaeaceae, is described and color photographs from the material collected in Sang Ma Sao Village, Muong Hum Commune, Bat Xat District, Lao Cai Province, Vietnam So far, this species only distributes in China (forests, shrubby slopes and also cultivated in Fujian, Guangdong, Guangxi, Guizhou, Henan, Hunan, Jiangxi, Yunnan, Zhejiang) and Japan (cultivated and naturalized) This paper also mentions the conservation status of the species and discussion on
different morphological characters between E tomentosa and E gardneri
Key words: Edgeworthia, Edgeworthia tomentosa, Lao Cai, new record, Vietnam
INTRODUCTION*
So far, the genus Edgeworthia Meisner and
the species E tomentosa (Thunb.) Nakai
belong to Thymelaeaceae, was known
including about 4 species and distributed in
Asia (China, Japan) [3], [4], [7] So far, there
is only one species (E tomentosa (Thunb.)
Nakai.) in Vietnam [1], [5] In 2017, during
investigation in Bat Xat District, Lao Cai
Province, Vietnam, we found a Edgeworthia
plant small tree, an interesting species of
Thymelaeaceae was encountered Hence, we
report this species as a new distributional
record for the flora of Vietnam, with a single
population found in the primary broad-leaved
evergreen closed forest, nearby waterfall in
Lao Cai Province, not common in the studied
areas More extensive field surveys are
needed to find more E tomentosa populations
that probably exist somewhere in similar
habitats in this studied areas This work will
provide insight for conservation and
management of rare and threatened plant
species in Vietnam The taxonomic
description, color photographs, distribution,
*
Tel: 0982 166390; Email: bhquang78@gmail.com
ecology, phenology and conservation of this species are provided to facilitate its easy identification (fig 1) This species is morphologically most similar to E tomentosa, in having erect small tree to 2 - 3
m tall, leaves membranaceous, elliptic to obovate However, this species can be differentiated from the inflorescences; peduncle 1 - 2 cm, grayish white hirsute; bracts ca 10, pilose; flowers fragrant; calyx yellow inside, 13 - 20 × 4 - 5 mm, tube exterior densely white sericeous, lobes 4,
ovate-lanceolate, ca 3.5 × 3 mm In E
gardneri: inflorescences peduncle pendulous,
2 - 2.5 (-5) cm, white sericeous at anthesis, glabrescent; bracts caducous, leaflike, narrowly lanceolate; calyx ca 15 mm) [7] (see table 1)
MATERIALS AND METHODS
Materials: Plants mentioned in this paper
were collected during field studies in 2017 Herbarium specimens of each studied species are presently housed in Hanoi
Methods: Observations of flowers were made
mostly on living plants in their habitats Additionally, flowers were preserved in spirit
Trang 2for subsequent studies and preparation of
herbarium specimens They were fixed and
preserved in 50 - 60% ethanol Measurements
of floral parts for description were made on
both living and liquid-preserved materials
Fresh flowers or floral parts were found to
shrink up to ca 15 - 20% in size in the drying
process of making herbarium specimens This
was taken into account when dried herbarium
specimens were identified In describing
quantitative characters, infrequent extreme
values (i.e rarely occurring minimum and
maximum values) of a variation range are
parenthesized before and after a normal
variation range respectively
RESULTS AND DISCUSSION
Key species Edgeworthia in Vietnam
1a Leaves deciduous, absent at
flowering……… 1 E tomentosa
1b Leaves evergreen or biennial, present at
flowering……….2 E gardneri
Taxonomic Treatment:
Edgeworthia tomentosa (Thunb.) Nakai in
Bot Mag Tokyo 33: 206 1919, et in Journ
Am Arb 5: 82 1924 (Fig 1)
- E gardneri auct non Meisn: Hook f Fl,
Brit Ind 5: 195 1886, p p ; Hemsl in
Journ Linn Soc Bot 26: 396 1891
- E papyrifera (Sieb.) Sieb et Zucc in
Abh Bay Akad Wiss Math Phys 4 (3):
199 1846
Shrubs or tree to 1.5 - 2 m tall, deciduous,
branching usually trichotomous Branchlets
brown, strong, stout, usually pubescent when
young Leaves falling before anthesis; leaf
blade oblong, lanceolate, or oblanceolate, 8
-20 × 2.5 - 5.5 cm, both surfaces whitish gray
sericeous, more densely in abaxially; base
gradually narrowed, cuneate; apex apiculate;
lateral veins 10 - 13 pairs, slender, curved,
pubescent Inflorescences terminal and
axillary, capitate, 30 - 50 flowered; peduncle
1 - 2 cm, grayish white hirsute; bracts ca 10,
pilose Flowers fragrant Calyx yellow inside,
13 - 20 × 4 - 5 mm; tube exterior densely white sericeous; lobes 4, ovate-lanceolate, ca 3.5 × 3 mm Anthers subovoid, ca 2 mm Disk shallowly cup-shaped, margin irregular Ovary ovoid, ca 4 × 2 mm, apex sericeous; style glabrous, ca 2 mm; stigma globose, ca
3 mm Drupe ellipsoid, ca 8 × 3.5 mm, apex pubescent
Flowering: (Mar-April), Fruit (April-May) Distribution: North Vietnam: Lao Cai (Bat
Xat: Sang Ma Sao); South China (Fujian, Guangdong, Guangxi, Guizhou, Henan, Hunan, Jiangxi, Yunnan, Zhejiang); cultivated and naturalized in Japan
Ecology and habitat: Primary broad-leaved
evergreen closed forest, on steep shady slope, humid area, nearby waterfall, at the elevation
of 2547 m asl
Specimens examined: North Vietnam, Lao
Cai Province: Bat Xat District, 06th April,
2017, B H Quang 300 (HN), at elevation about 2547 m a.s.l around point 22°24’28.5N 103°44’58.1E, locally not common
Notes: E tomentosa is morphologically
similar to E gardneri, a rare species on the in
west north of Vietnam, and might be mistaken for the same at the first sight The main differences between the two taxa are mentioned below (Table 1)
Conservation status: So far, there is a single
distribution site recorded in Vietnam The E
tomentosa has Area of Occupancy (AOO)
estimated less than 20 km2 and number of matured individuals unknown Moreover, this species with limitation of typical habitat characterized by primary forest, on steep shady slope, humid area, nearby waterfall, at
a certain elevation (above 2000 m.a.s.l.), is not common in the studied areas Therefore, according to the IUCN Red List criteria
(IUCN, 2001) [2], E tomentosa is proposed
to be listed as Vulnerable under criterion D2
Trang 3Table 1 Morphological comparison of E tomentosa with E gardneri
Morphological
characters
Leaves Blade oblong, lanceolate or oblanceolate, 8 -
20 × 2.5 - 5.5 cm, both surfaces whitish gray sericeous, more densely in abaxially; base gradually narrowed, cuneate; apex apiculate;
lateral veins 10 - 13 pairs, slender, curved, pubescent
blade narrowly elliptic to elliptic-lanceolate, 6 - 10 × 2.5 - 3.4 cm, both surfaces appressed pubescent; base cuneate; apex acute; lateral veins 8 or 9 pairs, conspicuous
Inflorescences Peduncle 1 - 2 cm, grayish white hirsute peduncle pendulous, 2 - 2.5 (-5)
cm, white sericeous at anthesis, glabrescent
narrowly lanceolate
Calyx Calyx yellow inside, 13 - 20 × 4 - 5 mm; tube
exterior densely white sericeous, lobes 4, ovate-lanceolate, ca 3.5 × 3 mm
Calyx ca 15 mm, exterior densely white sericeous; lobes 4, yellow adaxially, ovate, ca 3.5 × 2.5 mm, abaxially densely sericeous, apex acute or rounded
Ovary Ovary ovoid, ca 4 × 2 mm, apex sericeous;
style glabrous, ca 2 mm; stigma globose, ca
3 mm
Ovary ellipsoid, ca 5 mm, uniformly densely grayish white sericeous; style pubescent, ca 2 mm; stigma globose, ca 3 mm
*Morphological characters following Yinzheng et al (2013) [7]
CONCLUSION
E tomentosa, a new record for the Flora of
Vietnam, with a single population found in
the primary broad-leaved evergreen closed
forest, on steep shady slope, humid area,
nearby waterfall, at the elevation of 2547 m
a.s.l in Lao Cai Province, is preliminarily
assessed conservation status of Vulnerable
under criterion D2 (VU D2) More extensive
field surveys are needed to find more E
tomentosa populations that probably exist
somewhere in similar habitats in the studied
areas This work will provide insight for
conservation and management of rare
Acknowledgements
We are thankful to the curators of herbarium
of Institute of Ecology and Biological
Resources (HN) and herbarium of South
China Botanical Garden, (IBSC) for allowing
us to study the vouchers
REFERENCES
1 Nguyen Tien Ban (2003), Thymelaeaceae In: Checklist of Plant Species of Vietnam 2, Agricultural
Publishing House, Hanoi, pp 467-470
2 IUCN (2015), IUCN Red List Categories and Criteria, Version 3.1 IUCN Species Survial
Commission, Gland, Switzerland, and Cambridge, United Kingdom, 30 pp
3 Murata J (1999), “Thymelaeaceae” In K Iwatsuki Flora of Japan, 2c, pp 146–151
4 Nakai Takenoshin (1919), Botanical Magazine, Tokyo 33: 206
5 Pham Hoang Ho (1999), An Illustrated Flora
of Vietnam Vol 2, Young Publishing house, Ho Chi Minh, Vietnam, pp 117
6 Ministry of Science and Technology (2007),
Vietnam red list data book, part II Plant, Natural
science and Technology Publishing house, Hanoi
7 Yinzheng Wang, Michael G Gilbert, Brian F Mathew, Christopher Brickell & Lorin I Nevling (2007), “Flora of China (Clusiaceae through
Araliaceae)”, Science Press & Missouri Botanical Garden Press, Beijing & St Louis, 13, pp 1-548
Trang 4Figuge 1 1 Habitas; 2,3 Inflorescence; 4,5,6 Flowers; 7 Fruit
(All photo by Bui Hong Quang)
TÓM TẮT
GHI NHẬN MỚI LOÀI Edgeworthia tomentosa (Thunb.) Nakai
Họ (Thymelaeaceae) CHO HỆ THỰC VẬT VIỆT NAM
Nguyễn Thị Vân 1 , Trần Đức Bình 2 , Sỹ Danh Thường 3 , Bùi Hồng Quang 2*
1 Trường Đại học Nông Lâm Bắc Giang,
2 Viện sinh thái và Tài nguyên sinh vật - Viện Hàn lâm Khoa học và Công nghệ Việt Nam,
3 Trường Đại học sư phạm – ĐH Thái Nguyên
Họ Trầm (Thymelaeaceae) bao gồm 48 chi, khoảng 650 loài, phân bố rộng rãi ở cả 2 bán cầu Chi
Edgeworthia là một chi nhỏ thuộc họ Trầm (Thymelaeaceae), bao gồm 5 loài, phân bố ở châu Á (Bhutan, Trung Quốc, Ấn Độ, Nhật Bản, Myanmar, Nepal, Việt Nam) Trong số 5 loài thuộc chi này, có 3 loài là đặc hữu của Trung Quốc Ở Việt Nam, chi này chỉ có 1 loài là E gardneri (Wall.) Meisn., chỉ phân bố ở Khánh Hòa Trong bài báo này, E tomentosa (Thunb.) Nakai, một loài bổ
sung mới cho hệ thực vật Việt Nam thuộc họ Trầm (Thymelaeaceae) đã được mô tả và chụp ảnh màu từ vật liệu thu thập được ở thôn Sàng Ma Sao, xã Mường Hum, huyện Bát Xát, tỉnh Lào Cai, Việt Nam Trước đây, loài này chỉ phân bố ở Trung Quốc (trong rừng, thảm cây bụi dốc và được trồng ở một số tỉnh như Phúc Kiến, Quảng Đông, Quảng Tây, Quý Châu, Hà Nam, Hồ Nam, Giang Tây, Vân Nam, Chiết Giang) và được nhập và trồng ở Nhật Bản Bài báo cũng đề cập đến
tình trạng bảo tồn và thảo luận các đặc điểm hình thái khác nhau giữa E tomentosa và E gardneri,
cung cấp đầy đủ mô tả hình thái học, hình ảnh, phân bố và sinh thái học của loài này
Từ khóa: Edgeworthia, Edgeworthia tomentosa, Lao Cai, new record, Vietnam
Ngày nhận bài: 26/02/2018; Ngày phản biện: 12/3/2018; Ngày duyệt đăng: 27/4/2018
*
Tel: 0982 166390; Email: bhquang78@gmail.com