Pavetta polyantha (Hook.f.) Wall. ex Bremek. (Rubiaceae): A NEW RECORD TO THE FLORA OF VIETNAM

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Nguyễn Tiến Thanh Tùng và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 187(11): 169 - 172

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Pavetta polyantha (Hook.f.) Wall. ex Bremek. (Rubiaceae): A NEW RECORD TO THE FLORA OF VIETNAM

Nguyen Tien Thanh Tung², Tran Duc Binh¹, Sy Danh Thuong³, Bui Hong Quang^1,2*

1Institute of Ecology and Biological Resources - VAST,

2Graduate University of Science and Technology - VAST,

3 TNU-University of Education

ABSTRACT

Pavetta polyantha (Hook.f.) Wall. ex Bremek., a new record for the flora of Vietnam belong to Rubiaceae, is studied and described. Before, this species only distribited in China (Guangdong, Guangxi, Guizhou, Yunnan), Bhutan, India, Indonesia, Myanmar, Philippines. In this paper, we discrible fully about original reference and relevant references, type, morphological characteristics, distribution, ecology, picture, the table compares the characteristics to the nearest species (Pavetta swatowica Bremek.). Pavetta polyantha is similar to P. swatowica but difference by the size and type of hair in petiole; shape and size of leaf; type of inflorescence, position of inflorescence, type of hair in inflorescence and the size of peduncle; character of corrola and size of style.

Keywords: new record Pavetta, Pavetta polyantha, Rubiaceae, Vietnam

INTRODUCTION^*

Pavetta L. (Rubiaceae) is a genus of over 340 species distributed from Africa through Arabia, India and South-East Asia to tropical Australia [1], [2], [3], [4], [6]. In Vietnam, the genus Pavetta was taxonomically studied by several authors [7], [8], [9] and currently 19 species has been reported [7], [8]. After examining all the specimens of Pavetta from Vietnam kept at HN, specimens collected in 1964 from Dan Khao Mountain, Vang Leng Village, Tung Chung Pho Commune, Muong Khuong District, Lao Cai Province, the north of Vietnam, are found to be different from known Vietnamese species by leaf blade drying membranous, narrowly obovate or lanceolate, 9-13 x 3.5-4.7 cm, with several bacterial nodules, adaxially glabrescent, abaxially puberulent at least along veins, base cuneate or acute, apex acuminate; secondary veins 6-8 pairs. Further studies reveals that it represent a new recorded species from Vietnam, Pavetta polyantha (Hook.f.) Wall.

ex Bremek., and is closed to Pavetta swatowica Bremek., in the leaf blade drying membranous, narrowly obovate or lanceolate.

*Tel: 0982 166390; Email: bhquang78@gmail.com

The present study gives the species description and photographed (Fig. 1).

Furthermore, a comparison of diagnostic characters between this species and a related species, Pavetta swatowica Bremek. is made.

(Table 1).

MATERIALS AND METHODS

Materials: This study is mainly based on examination of all the specimens of Pavetta examined using light microscope. Photographs of the type specimens of Pavetta polyantha was kept in the Kew herbbarium (K).

Methods: We have applied the morphological comparison method in this study, according to Pham Hoang Ho [7], Tran Ngoc Ninh [9].

RESULTS AND DISCUSSION Taxonomic Treatment

Pavetta polyantha (Hook.f.) Wall. ex Bremek., Repert. Spec. Nov. Regni Veg. 37:

103. 1934; Chen T, Taylor C.M. et al. in Wu

& Raven (eds.), Fl. China 19: 330, 2011.

TYPE: India, Meghalaya, Mt Sillet, Wallich, N., 6176 (K000031477) K– Photo!). – Pavetta indica L. var. polyantha J. D. Hooker, Fl. Brit. India 3: 150. 1880.

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Shrubs, 1-3 m tall; young branches compressed to subterete, glabrescent or puberulent. Petiole 10-30 mm, puberulent;

leaf blade drying membranous, narrowly obovate or lanceolate, 9-13 x 3.5-4.7 cm, with several bacterial nodules, adaxially glabrescent, abaxially puberulent at least along veins, base cuneate or acute, apex acuminate; secondary veins 6-8 pairs; stipules ovate-triangular, 5-7 mm, puberulent or glabrescent, shortly aristate. Inflorescences terminal on developed branches, laxly corymbose, ca. 9 x 15 cm, many flowered, strigillose to glabrescent; peduncle 1.5-2 cm;

pedicels 3-5 mm. Flowers pedicellate. Calyx with hypanthium portion ellipsoid, 1-1.2 mm, densely strigillose; limb 1-1.5 mm, sparsely strigillose, lobed for up to 1/2. Corolla white, outside glabrous; tube 19-22 mm, bearded in throat; lobes narrowly ligulate, 6-7 mm, obtuse to rounded. Style ca. 30 mm. Drupe globose, ca. 8 mm, glabrous. (Fig. 1).

Distribution: China (Guangdong, Guangxi, Guizhou, Yunnan), Bhutan, India, Indonesia, Myanmar, Philippines, Vietnam (Lao Cai Province).

Ecology: Sparse forests, streamsides; 900-1200 m

Specimens examined: VIET NAM, Lao Cai Province, Muong Khuong District, Tung Chung Pho Commune, Vang Leng Village, DKSVT 3256, 29^th December, 1964 (HN!).

Notes: P. polyantha is superficially similar to P. swatowica., a wide spread species on the from Dan Khao Mountain, Vang Leng Village, Tung Chung Pho Commune, Muong Khuong District, Lao Cai Province, the north of Vietnam, and might be mistaken for completely separate taxon at first sight. The differences between the two taxa are presented in Table 1.

CONCLUSION

1. Discribled morphological characteristics with figure, distribution, ecology, specimens examined of Pavetta polyantha (Hook.f.) Wall. ex Bremek

2. List mainly morphological characteristics about petiole, leaf, inflorescences, corrola, style between Pavetta polyantha and P.

swatowica

Acknowledgement

We are thankful to the herbarium of the Institute of Ecology and Biological Resources and Master's degree program of the Graduate University of Science and Technology (GUST)-Eco17.1- 2018-19.

Table 1. Morphological comparison of P. polyantha with P. swatowica Morphological

characters P. polyantha P. swatowica

Petiole 10-30 mm, puberulent 10-20 mm, pilosulous Leaves leaf blade drying membranous,

narrowly obovate or lanceolate, 9-13 × 3.5-4.7 cm

leaf blade drying thinly papery or submembranous, narrowly elliptic or oblanceolate, 10-13 × ca. 5 cm Inflorescences terminal on developed branches, laxly

corymbose, ca. 9 × 15 cm, many flowered, strigillose to glabrescent;

peduncle 1.5-2 cm

terminal on developed branches, laxly corymbose, many flowered, pubescent; peduncles 2-3 cm;

pedicels 4-6 mm Corolla white, outside glabrous; tube 19-22

mm, bearded in throat; lobes narrowly ligulate, 6-7 mm, obtuse to rounded.

white, outside glabrous; tube ca. 14 mm, sparsely tomentose inside; lobes narrowly oblong or oblong- lanceolate, ca. 6 mm.

Style ca. 35 mm ca. 30 mm

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171 REFERENCES

1. Chen T., Taylor C. M. (2011), “Pavetta. In: Wu Z. Y., Raven P. H. (Eds) Flora of China”, Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, vol. 19, pp. 330-339.

2. Govaerts R. (2003), World Checklist of Selected Plant Families Database in ACCESS: 1-216203.

The Board of Trustees of the Royal Botanic

Gardens, Kew. ‘The Plant

List’(www.theplantlist.org).

3. IUCN (2016), Guidelines for using the IUCN red list categories and criteria, ver. 12. –

<www.iucnredlist.org/documents/

RedListGuidelines.pdf>, accessed 24 Jun 2016.

4. Lo Hsien Shui (1986), “Materials for chinense Rubiacae”, Bulletin of Botanical Research, Harbin 6(4), pp. 39-40.

5. Lo Hsien Shui (1987), “Rubiacae”, Acta Botanica Yunnanica, 9(3), pp. 301.

6. Merrill Elmer Drew (1942), “Records of Indo- Chinese plants”, Journal of the Arnold Arboretum, III. 23(2), pp. 195–196.

7. Pham Hoang Ho (2003), An Illustrate Flora of Vietnam, vol. 3, Young Publishing, pp.124.

8. Pit. (1922), “Pavetta. In: Lecomte (Eds.)”, Flore Générale de L’Indochine, Paris, 3, pp. 85.

9. Tran Ngoc Ninh ( 2005), Rubiaceae. In:

Nguyen Tien Ban (Eds), Checklist of Plant Species of Vietnam, Vol. 3. Vietnamese Academy of Science and Technolology, Hanoi, pp. 1169.

Figuge 1. Specimens of Pavetta polyantha (Hook.f.) Wall. ex Bremek., collected in Lao Cai Province, Muong Khuong District, Tung Chung Pho Commune, Vang Leng Village, DKSVT 3256 HN. (Photos by

Nguyen Tien Thanh Tung)

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TÓM TẮT

Pavetta polyantha (Hook.f.) Wall. ex Bremek. (Rubiaceae):

LOÀI BỔ SUNG CHO HỆ THỰC VẬT VIỆT NAM

Nguyễn Tiến Thanh Tùng², Trần Đức Bình¹, Sỹ Danh Thường³, Bùi Hồng Quang^1,2*

1Viện sinh thái và Tài nguyên sinh vật - Viện Hàn lâm Khoa học và Công nghệ Việt Nam,

2Học Viện khoa học và Công nghệ - Viện Hàn lâm Khoa học và Công nghệ Việt Nam,

3Trường Đại học Sư phạm - ĐH Thái Nguyên

Pavetta polyantha (Hook.f.) Wall. ex Bremek., loài thực vật bổ sung cho hệ thực vật Việt Nam thuộc họ Cà phê (Rubiaceae) đã được nghiên cứu và mô tả. Trước đây, loài này chỉ được ghi nhận phân bố ở tỉnh Quảng Đông, Quảng Tây, Quý Châu, Vân Nam (Trung Quốc), Bhutan, Ấn Độ, Indonesia, Myanmar và Philippines. Trong bài báo này, chúng tôi mô tả chi tiết tài liệu gốc và các tài liệu có liên quan, mẫu type chuẩn, đặc điểm hình thái, phân bố và sinh thái, ảnh minh họa, bảng so sánh các đặc điểm với loài gần nhất (Pavetta swatowica Bremek.). Loài Pavetta polyantha có đặc điểm hình thái giống với loài P. swatowica nhưng khác nhau bởi kích thước và kiểu lông trên cuống lá; hình dạng và kích thước của lá; kiểu cụm hoa, vị trí cụm hoa, kiểu lông trên cụm hoa và kích thước của cuống cụm hoa; đặc điểm của tràng hoa và kích thước của vòi nhụy.

Từ khóa: new record, Pavetta, Pavetta polyantha, Rubiaceae, Vietnam

Ngày nhận bài: 25/10/2018; Ngày phản biện: 29/10/2018; Ngày duyệt đăng: 31/10/2018

*Tel: 0982 166390; Email: bhquang78@gmail.com