Begonia vivipara Aver., Nuraliev & Y.M.Shui, 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 : 86

6. Begonia vivipara Aver., Nuraliev & Y.M.Shui , sp. nov. ( Fig. 6 )

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

Diagnosis:— Remarkable in producing bulbils at junction of petiole and leaf blade; most close to B. longialata K.Y.Guan & D.K.Tian (2000: 132) , differing in petiole 5–10 cm long, shallowly lobed leaf blade 8–12 cm long and wide and setose on both sides and margin, staminate flowers with pedicel 12–22 mm long and tepals subequal in length, pistillate flowers with pedicel 0.4–1.2 cm long and with 4 tepals, styles 2.2–3 mm long. Also the new species is similar to B. macrotoma Irmscher (1951: 41) , differing in its abaxially hairy leaf blade, glabrous peduncle, abaxially glabrous outer tepals of staminate flowers and all tepals of pistillate flowers, staminate flowers with outer tepals 10–15 mm long and 16–21 mm wide, pistillate flowers with 2 or 3 styles.

TYPE:— LAO PDR. Champasak Province: at the base of Tad Tayicseau Waterfall , 15°05’02.9’’N 106°35’28.8’’E, at elevation 725 m a.s.l., lithophyte on stream rocks along shady river slopes, 07 December 2017 , E. Konstantinov , T. Vongsa , K 418 (holotype LE: LE01057897 http://en.herbariumle.ru/?t=occ&id=8387) .

Figures

FIGURE 6. Begonia vivipara. A. Habitat. B, C. Flowering plants in natural habitat. D. Central part of leaf. E. Leaf base with bulbil at adaxial side. F. Intact inflorescence branch with open staminate flowers. G. Flattened plant and detached floriferous stem prior to preparation of the herbarium holotype specimen. H. Inflorescence with open staminate flowers and preanthetic pistillate flowers (left); staminate flower, front view (right). I. Flattened inflorescence branch with pistillate flowers and a separate pistillate flower. J. Fresh and dry fruits and cross section of ovary (near the base). K. Cross section in the ovary base showing placentation. Photos made from the plant used for preparation of the holotype herbarium specimen Konstantinov, Vongsa, K 418 by E. Konstantinov, correction and design by L. Averyanov and T. Maisak.