Begonia rotundilimba S.H.Huang & Y.M.Shui

Averyanov, Leonid V., Nuraliev, Maxim S., Konstantinov, Eugene L., Maisak, Tatiana V., Kopylov-Guskov, Yury O., Lyskov, Dmitry F., Quang, Bui Hong, Kuznetsov, Andrey N., Kuznetsova, Svetlana P., Nguyen, Khang Sinh & Shui, Yu-Min, 2021, New and noteworthy species of Begonia (Begoniaceae) from Vietnam and Laos, Phytotaxa 522 (2), pp. 75-93 : 85

4. Begonia rotundilimba S.H.Huang & Y.M.Shui (1994: 335, Fig. 3 ) ( Fig. 4 )

Ku (1999: 187), Shui et al. (2002: 317, 2019b: 218, Fig. 47D, E), Huang & Shui (2006: 171, Fig. 49), Gu et al. (2007: 196), Shui & Chen (2017: 246).

B. sect. Platycentrum ( Klotzsch 1855: 243) de Candolle (1859: 134).

TYPE:— CHINA. [Yunnan Province:] Pingbian Xian, Timi , 1600–1800 m, April 1959, Exped. Univ. Yunnan 59-8 ( YUKU [as YUNU]).

Ecology and phenology:— Evergreen forests, shrublands, shady moist environments, at 500–1800 m a.s.l. Flowering in April–October, fruiting from July.

Distribution: — China: Yunnan Province (Pingbian); northern Vietnam: Lao Cai Province (Bat Xat Nature Reserve) and Son La Province (Ta Xua Nature Reserve).

Note:— The species is reported here from Vietnam for the first time.

Specimens examined:— VIETNAM. Lao Cai Province : Bat Xat District, Bat Xat Nature Reserve, Y Ty Commune, 22°36’06.5’’N 103°39’03.2’’E, elev. 1420 m, 30 July 2019, Bui Hong Quang, Tran Duc Binh VN-RU 153 ( HN; MW: MW0757744 ; photos LE: LE 01093238 http://en.herbariumle.ru/?t=occ&id=96050) ; Son La Province: Bac Yen District, Ta Xua Nature Reserve, forest margin, 21°18’44’’N 104°31’49’’E, elev. 1340 m, 06 October 2019, Nuraliev M. S., Kopylov-Guskov Yu. O., Lyskov D. F. 2835 ( MW: MW0757091 ; photos LE: LE01093020 http:// en.herbariumle.ru/?t=occ&id=43975) ; Son La Province: Phu Yen District, Ta Xua Nature Reserve, forest on slope, 21°21’31’’N 104°39’47’’E, elev. 930 m, 09 October 2019, Nuraliev M. S., Kopylov-Guskov Yu. O., Lyskov D. F. 2892 ( MW: MW0757092 ; photos LE: LE01093021 http://en.herbariumle.ru/?t=occ&id=43976) .

Figures

FIGURE 3. Begonia maculifolia. A. Habit. B. Rhizome with petiole bases and young inflorescences.C, D. Leaf blade, adaxial and abaxial surfaces. E. Staminate flower, front view. F. Androecium, front view. G. Staminate flower, back view. H–J. Pistillate flower, side, front and back views. K. Dried capsule, front view. Nuraliev 2463a (holotype; A, H–J) and Nuraliev, Kuznetsov, Kuznetsova 2414 (paratype; B–G, K). Photos and design by M. Nuraliev.

FIGURE 4. Begonia rotundilimba. A. Habit. B, C. Leaf blade, adaxial and abaxial surfaces. D. Part of inflorescence. E. Staminate flower, front view. F–H. Pistillate flower, front, back and side views. Nuraliev, Kopylov-Guskov, Lyskov 2835 (A–E) and Nuraliev, Kopylov- Guskov, Lyskov 2892 (F–H). Photos and design by M. Nuraliev.