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Trần Đức Bình và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 180(04): 53 - 56 Aucuba robusta W. P. Fang & T. P. Soong (Aucubaceae): A NEW RECORD TO THE FLORA OF VIETNAM Tran Duc Binh1, Nguyen Thi Van2, Tran The Bach , Sy Danh Thuong3, Bui Hong Quang1* 1 1 Institute of Ecology and Biological Resources - Vietnam Academy of Science and Technology 2 Bacgiang Agriculture and Forestry University, 3TNU - University of Education SUMMARY Aucubaceae is a small family with only one genus (Aucuba), 10 species. This family distributes mainly in Bhutan, China, North India, Japan, Korea, Myanmar and Vietnam. Among 10 species, there are 7 endemic species in China. In Vietnam, this family has only 1 species - Aucuba japonica Thunb., distribution in Lang Son (Mau Son). During the investigation in Bat Xat, Lao Cai, we found A. robusta P. P. Fang & T. P. Soong. Previously, this species only distributes in Quang Tay Province (China). This is new record for the flora of Vietnam. This paper provides fully important information of A. robusta P. P. Fang & T. P. Soong such as: description, color photo, type, distribution and morphological comparison with closely species of Aucuba Thunb. in Vietnam. Keywords: Aucuba robusta, Aucubaceae, Lao Cai, new record, Vietnam INTRODUCTION* Aucuba Thunb. is a genus of 10 species and commonly distributed in the Bhutan, China, North India, Japan, Korea, Myanmar and Vietnam. This genus has some main characters such as: trees or shrubs, branches often pubescent when young, glabrous when old; leaves lanceolate to obcordate, pubescent or grabrous, margin serrate, glandular serrate or dentate, rarely entire, leathery or papery; flowers calyx lobes minute, triangular or slightly orbicular; petals free, valvate, purplish red, yellow, or green, oblong or ovate, apex acuminate or caudate; fruit a slightly cylindrical or ovoid [5]. One species and two varieties of Aucuba are distributed in Vietnam: A. japonica Thunb., A. japonica var. maculata Regel and A. japonica var. variegata Dombrain [3]. Until now, A. japonica var. maculata Regel and A. japonica var. variegata Dombrain are synonym of Aucuba japonica Thunb.. So, Acububa in Vietnam have one species is Aucuba japonica Thunb. (Table 1). During our regular survey work at Ta Giang Phinh commune, Sa Pa district, Lao Cai province and Y Ty commune, Bat Xat district, Lao Cai province in the East North of Vietnam, we encountered an interesting species of Aucuba which was identified as A. robusta W. P. Fang & T. P. Soong, previously its distribution has been known only in Guangxi of China, (previously recognized as endemic to Guangxi, China), was reported in Vietnam. This plant differs from the closely related species. After carefully studying the available literature [1], [2], [4] and consulting the type specimens housed in different herbaria. The plant was found to be different from the known Vietnamese species by shorter staminate inflorescences (2 cm long), shape leaves often oblong or lanceolate, shorter petals (2 mm). In this study, we reported A. robusta as a newly added taxon to the Flora of Vietnam and its description, habitat, color photographs and key of related taxa are provided. * Key species of Aucuba in Vietnam Tel: 0982 166390; Email: bhquang78@gmail.com MATERIALS AND METHODS Materials: All species of the Aucuba Thunb. in Vietnam through speciemens stored in the herbariums. Methods: We have applied the morphological comparison method in this study. RESULTS AND DISCUSSION 53 Trần Đức Bình và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 1. Staminate inflorescences paniculate (ca. 710 cm); apex of petals shortly acuminate (ca. 0.5 mm); petals ca. 3.5 - 4.5 mm; stamens 1.25 mm; leaves thickly leathery............. ….. .................................................... A. japonica 1. Staminate inflorescences racemosepaniculate (ca. 2 cm); apex of petals caudate (ca. 1 mm); petals ca. 2 mm; stamens 1 mm; leaves thickly papery ..................................... ...................................................... A. robusta Taxonomic Treatment: Aucuba robusta W. P. Fang & T. P. Soong, J. Sichuan Univ., Nat. Sci. Ed. 1:70, 1982; Zhengy, W. & Raven, Fl. China 14: 224, 2005. TYPE: CHINA, Guangxi: Dongnan Xian, S.S. Chang 11444 (Isotype: IBSC, K). Shrubs, to 30 - 50 cm tall; branches stout, grayish brown or grayish yellow, pubescent. Petiole stout, 1.5 - 2 cm, sparsely pubescent; leaf blade abaxially whitish green, often oblong or lanceolate, rarely obovate-oblong, 10 - 16 × 2 - 3.7 cm, papery, adaxially sparsely pubescent, all veins raised except midvein adaxially, base cuneate, margin serrulate or denticulate with teeth ending in gland at end of vein, apex acuminate. Staminate inflorescences dark purple, ca. 2 cm. Carpellate inflorescences not seen, infructescences ca. 3.5 cm. Staminate flowers: calyx lobes 4, undulate; petals ovate, ca. 2 × 1.5 - 1.8 mm, apex caudate for ca. 1 mm; stamens ca. 1 mm. Carpellate flowers not 180(04): 53 - 56 seen. Fruit light green, dark brown when dry, oblong, ca. 1.2 cm, ca. 0.5 cm in diam., base slightly pubescent; fruiting pedicel grayish yellow, stout, pubescent, conspicuously expanded at juncture with fruit. (Fig. 1). Flowering: (Mar- April). Distribution: China (Guangxi). Vietnam Lao Cai province, Bat Xat district, Y Ty commune, Nhiu Co San mountain, primary evergreen broad-leaved humid forest on sandstone at elevation about 1931 m a.s.l. around point 22°37’35.00N 103°37’33.7E, small shrubs, to 30 - 50 cm tall, locally common. Specimens examined: VIET NAM, Lao Cai province, Bat Xat district, Y Ty: 14th April, 2017; T.T. Bach, B. H. Quang, T.D. Binh, D.H. Son, V.A. Thuong; VK 6996 (HN). Lao Cai province, Sa Pa district, Ta Giang Phinh: 06th April, 2017; B. H. Quang, N.V. Du, T.D. Binh, D.H. Son, D. Justice, B. White, A. Hill, S. McMahan, D. Hinkley; HN-UBC 163 (HN). CONCLUSION 1. Building the key to distinguish A. robusta and A. japonica. 2. The morphological characteristics and related information of the A. robusta have been described including type, fruit season, distribution, research sample, color photographs and the table compares the characteristics of A. robusta and A. japonica. Table 1. Morphological comparison of A. robusta with A. Japonica Morphological characters The color of the leaf Leaves Staminate inflorescences Apex of petals Petals Stamen A. robusta Whitish green oblong or lanceolate, rarely obovate-oblong, 10 - 16 × 2 - 3.7 cm, papery 2 cm long 1 mm 2 mm long 1 mm long A. japonica Light green narrowly elliptic to ovateelliptic, 8 - 20 × 5 - 12 cm, leathery 7-10 cm long 0,5 mm 3,5-4,5 mm long 1,25 mm long Acknowledgments We are thankful to the curators of herbarium of Institute of Ecology and Biological Resources (HN) for allowing us to study the vouchers and project on Bioprospecting on Biological Materials of Vietnam and Korea. 54 Trần Đức Bình và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ REFERENCES 1. Nguyen Tien Ban (2003), Checklist of Plant Species of Vietnam 2. Agricultural Publishing House, Hanoi, pp. 1063. 2. Fang Soong (1982), Journal Sichuan University: Natural Science Edition, vol. 1, 70. Pl. 5. fig. 1. 180(04): 53 - 56 3. Pham Hoang Ho (1999), An Illustrated Flora of Vietnam, Vol. 2, Young Publishing house, Ho Chi Minh, Vietnam, pp. 117. 4. Xiang Q. Y., David E. B. (2005), Flora of China, vol. 14, Science Press, (Beijing), pp. 222-226. 5. Xiang G. Y. (2016), The Families and Genera of Vascular Plants, vol. 14, New York Press, pp. 37-40. Figuge 1. 1. Habitas; 2. Leaves; 3. Inflorescence; 4,5,6. Flowers (All photo by Bui Hong Quang) 55 Trần Đức Bình và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 180(04): 53 - 56 TÓM TẮT Aucuba robusta W. P. Fang & T. P. Soong (Aucubaceae): MỘT LOÀI BỔ SUNG CHO HỆ THỰC VẬT VIỆT NAM Trần Đức Bình1, Nguyễn Thị Vân2, Trần Thế Bách , Sỹ Danh Thường3, Bùi Hồng Quang1* 1 1 Viện Sinh thái và Tài nguyên sinh vật - Viện HLKH&CN Việt Nam, 2 Trường Đại học Nông Lâm Bắc Giang, 3 Trường Đại học Sư phạm – ĐH Thái Nguyên Aucubaceae là họ thực vật nhỏ với chỉ 1 chi (Aucuba), khoảng 10 loài. Họ này phân bố chủ yếu ở Bhutan, Trung Quốc, bắc Ấn Độ, Nhật Bản, Hàn Quốc, Myanmar và Việt Nam. Trong số 10 loài, có 7 loài là đặc hữu của Trung Quốc. Ở Việt Nam, họ này mới ghi nhận chỉ có 1 loài là A. japonica Thunb., phân bố ở Lạng Sơn (Mẫu Sơn). Trong quá trình điều tra thực địa tại Bát Xát, Lào Cai, chúng tôi đã phát hiện được loài A. robusta P. P. Fang & T. P. Soong. Trước đây, loài này chỉ phân bố ở tỉnh Quảng Tây (Trung Quốc). Đây là loài thực vật ghi nhận mới cho hệ thực vật Việt Nam. Bài báo này cung cấp đầy đủ những thông tin quan trọng của loài A. robusta P. P. Fang &T. P. Soong bao gồm: Mô tả loài, hình ảnh màu, mẫu chuẩn, phân bố và so sánh hình thái với các loài liên quan của chi Aucuba Thunb. ở Việt Nam. Từ khóa: Aucuba robusta, Aucubaceae, 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 56