全 文 ：植 物 分 类 学 报 44 (5): 595–597(2006) doi:10.1360/aps050138
Acta Phytotaxonomica Sinica http://www.plantsystematics.com
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Received: 16 September 2005 Accepted: 27 September 2005
Clematis hagiangensis N. T. Do, a new species of
Ranunculaceae from Vietnam
Nguyen Thi DO
(Institute of Ecology and Biological Resources, Vietnam National Centre for Natural Science and Technology, Hanoi, Vietnam)
Abstract Clematis hagiangensis N. T. Do, a new species of the Ranunculaceae, is described
from Vietnam. In floral structure this new species is related to the American species of sect.
Aspidanthera subsect. Dioicae, but differs in its simple leaves and ovate or broadly ovate
sepals. This section is newly recorded in the Eurasian continent.
Key words Clematis, Clematis sect. Aspidanthera, Ranunculaceae, new species, Vietnam.

In 2005, while examining some undetermined specimens of the genus Clematis L.
collected from Ha Giang Province, Vietnam, I found out a gathering of several specimens with
staminate flowers. According to the works on Vietnam flora by Gagnepain (1907, 1938) and
the recent revision of sect. Aspidanthera of the genus by Wang (2004), I realized that it
represents a new species, and also the only Eurasian member of sect. Aspidanthera. In the
present paper this curious unisexual species is described.
Clematis hagiangensis N. T. Do, sp. nov. Fig. 1.
Species nova ob floris structuram eis subsect. Dioicarum (Prantl) W. T. Wang sect.
Aspidantherae Spach fortasse affinis, a quibus foliis omnibus simplicibus, sepalis ovatis vel
late ovatis differt.
Liana lignosa. Caules usque ad 3 m longi, ramis longitudinaliter vadoseque 6-sulcatis
sparse puberulis. Folia simplicia, opposita; laminae chartaceae, ovatae vel ovato-lanceolatae,
4–7 cm longae, 2.5–4.2 cm latae, apice acuminatae, basi rotundatae vel subtruncatae, margine
1–2-denticulatae vel integrae, supra glabrae, subtus ad nervos basales depresse puberulae,
nervis basalibus 5 subtus prominentibus; petioli 2–4 cm longi, puberuli. Cymae staminatae
axillares, 1(–2)-florae; pedunculi 1.3–3 cm longi, cum bracteis pedicellisque dense puberuli;
bracteae oppositae, lineares, 3 mm longae, 1 mm latae. Flos staminatus ca. 1.8 cm in diametro:
pedicellus ca. 1.6 cm longus; sepala 4, viridula, leviter ascendentia, ovata vel late ovata, 1–1.2
cm longa, 5–6 mm lata, apice acuta, intus glabra, extus fulvo-depresso-puberula, ad marginem
velutina; stamina numerosa, glabra, filamentis linearibus 3–4 mm longis, antheris luteolis
anguste oblongis 1.2–2 mm longis apice obtusis. Flos pistillatus ignotus.
Woody vine. Stems up to 3 m long; branches longitudinally, shallowly 6-sulcate, sparsely
puberulous. Leaves simple, opposite; leaf blades chartaceous, ovate or ovate-lanceolate, 4–7×
2.5–4.2 cm, apex acuminate, base rounded or subtruncate, margin 1–2-denticulate or entire,
adaxial surface glabrous, abaxial surface only on basal veins puberulous, basal veins 5,
abaxially prominent; petioles 2–4 cm long, puberulous. Staminate cymes axillary,
1(–2)-flowered; peduncles 1.3–3 cm long, together with bracts and pedicels densely
puberulous; bracts opposite, linear, 3×1 mm. Staminate flower ca. 1.8 cm in diam.: pedicel
ca. 1.6 cm long; sepals 4, greenish, slightly ascending, ovate or broadly ovate, 1–1.2×0.5–0.6
cm, inside glabrous, outside fulvous-appressed-puberulous, on margin densely velutinous,
apex acute; stamens numerous, glabrous; filaments linear, 3–4 mm long; anthers yellowish,
narrowly oblong, 1.2–2 mm long, apex obtuse. Pistillate flower unknown.
Vietnam. Ha Giang Prov.: Quen Ba, Bat Dai Son Mount., alt. 1100–1200 m, 2000-04-05,
Acta Phytotaxonomica Sinica Vol. 44 596

Fig. 1. Clematis hagiangensis N. T. Do. A, staminate flowering branch; B, staminate flower; C, stamen.
Drawn by Y. B. Sun from the type gathering, D. Harder & L. V. Averyanov 5177.
No. 5 Nguyen Thi Do: Clematis hagiangensis N. T. Do, a new species of Ranunculaceae from Vietnam 597
D. Harder & L. V. Averyanov 5177 (holotype, HN; isotypes, HN, MO, PE).
In floral structure, this new species is related to the members of subsect. Dioicae (Prantl)
W. T. Wang, sect. Aspidanthera Spach, but differs in its simple leaves and ovate or broadly
ovate sepals. In the species of the American subsect. Dioicae, the leaves are usually
compound, and only in Clematis dimorphophylla W. T. Wang and C. variifolia W. T. Wang
both simple and compound leaves are present, and the sepals are oblong, oblanceolate, or
narrowly ovate (Wang, 2004).
Acknowledgements I thank Prof. WANG Wen-Tsai of the Institute of Botany, the Chinese
Academy of Sciences, for assistance with the Latin description of the new species, and to Mr.
SUN Ying-Bao for preparation of the drawing.
References
Finet E A, Gagnepain F. 1907. Ranunculaceae. In: Lecomte H ed. Flore générale de l’Indo-Chine. Paris:
Masson et Cie. 1: 1–11.
Gagnepain F. 1938. Ranunculaceae. Supplément a la Flore générale de l’Indo-Chine. Paris: Masson et Cie. 1:
2–17.
Wang W-T (王文采 ). 2004. A revision of Clematis sect. Aspidanthera s.l. (Ranunculaceae). Acta
Phytotaxonomica Sinica (植物分类学报) 42: 1–72, 97–135.
越南铁线莲属一新种
Nguyen Thi DO
(Institute of Ecology and Biological Resources, Vietnam National Centre for Natural Science and Technology, Hanoi, Vietnam)

摘要 本文描述的产于越南的毛茛科Ranunculaceae铁线莲属Clematis一新种C. hagiangensis N. T. Do是
欧亚大陆第一个具单性花的种, 在花构造方面与单性铁线莲组单性铁线莲亚组sect. Aspidanthera Spach
subsect. Dioicae (Prantl) W. T. Wang的种类近缘, 但叶均为单叶, 萼片呈卵形或宽卵形而不同。在单性铁
线莲亚组的种, 叶通常为复叶, 只在C. dimorphophylla W. T. Wang和C. variifolia W. T. Wang同时为单叶
和复叶, 此外萼片呈长圆形、倒披针形或狭卵形。
关键词 铁线莲属; 单性铁线莲组; 毛茛科; 新种; 越南