Two new species of Begonia (sect. Platycentrum, Begoniaceae) from the Central Highlands of Vietnam: B. villosula and B. lophura Author Hoang, Thanh Son 0000-0003-0351-929X Institute of Applied Technology, Thu Dau Mot University, Binh Duong Province 820000, Vietnam hoangthanhson@tdmu.edu.vn Author Lin, Che-Wei 0000-0002-8564-5793 Herbarium of Taiwan Forestry Research Institute, Taiwan Forestry Research Institute, No. 53, Nan-Hai Road, Taipei 100, Taiwan varalba@gmail.com text Phytotaxa 2021 2021-07-09 510 3 263 274 http://dx.doi.org/10.11646/phytotaxa.510.3.6 journal article 305306 10.11646/phytotaxa.510.3.6 64a298b6-5ba6-4f8a-b372-524b516ba330 1179-3163 5426458

TABLE 1. Comparison of Beg oni a villosula T.S.Hoang & C.W.Lin, thomsonii A. DC. and B. villifolia Irmsch.

	B. villosula (Figures 2, 3)	B. thomsonii	B. villifolia
Aerial stem	seen only at anthesis	seen only at anthesis	year-round
Leaf
vestiture
adaxial	densely minutely raised cones topped, hirsute	relatively flat, villous	flat, villous
margin	crenate to crenulate	entire with teeth at end of veins to denticulate	irregularly serrate, shallowly lobed
Staminate flower
pedicel vestiture	hirsute	villous	villous
Tepal size (mm)
outer	10–15 × 8–12	8–13 × 5–8	12–29 × 8–22
inner	10–13 × 4–6	4–9 × 2–4	26–27 × 17
number of stamens	80–120	35–70	ca. 400
Pistillate flower
number of tepals	4	5	5
ovary vestiture	hirsure	villous	villous