Begonia gracilifolia Y.M.Shui, Nuraliev & Aver., 2021

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 : 79

2. Begonia gracilifolia Y.M.Shui, Nuraliev & Aver. , sp. nov. ( Fig. 2 )

B. sect. Petermannia ( Klotzsch 1854: 124) de Candolle (1859: 128).

Diagnosis:— Similar to B. rubrosetosa Aver. in Averyanov & Nguyen (2012: 20) and B. saolaensis Y.M.Shui, T.A.Le & C.T.Vu in Shui et al. (2019a: 61), differing in glabrous stem, petiole, leaf blade, pedicel and ovary, stipules 4–8 × 1.5–3 mm, narrowly oblong-lanceolate leaf blade, tepals of staminate flowers 2–3.5 mm long, tepals of pistillate flowers 3–4.5 mm long and abaxially hairy, styles 1 mm long.

TYPE:— VIETNAM. Quang Nam Province: Nam Giang District, Song Thanh Nature Reserve , in the forest, river bank, 15°33’55’’N 107°23’15’’E, elev. 1000 m, 27 April 2019, Nuraliev M. S. 2425 (holotype MW: MW0595740 ; isotypes E, MW: MW0595741 ; photos LE: LE01093019 http://en.herbariumle.ru/?t=occ&id=43974) .

Figures

FIGURE 2. Begonia gracilifolia. A. Habit. B. Leaf blade, abaxial surface. C. Inflorescence. D. Staminate flower, front view. E, F. Pistillate flowers, front views. G. Pistillate flower, back view. H, I. Pistillate flower, oblique and side views. J. Cross section of ovary. K. Dehisced fruit, side view. Nuraliev 2425 (holotype). Photos and design by M. Nuraliev.