Begonia rigidifolia ssp. sonhungii (sect. Petermannia, Begoniaceae), a new subspecies from limestone hills in Central Vietnam Author Lin, Che-Wei Herbarium of Taiwan Forestry Research Institute (TAIF), Taiwan Forestry Research Institute, No. 53, Nan-Hai Road, Taipei 100, Author Phan, Luong-Cong-Son 0000-0002-7239-4331 89 Tran Van Du Street, My An Ward, Ngu Hanh Son District, Da Nang City, Vietnam. congphan 0212 @ gmail. com; https: // orcid. org / 0000 - 0002 - 7239 - 4331 hungocnguyen 01 @ gmail. com; https: // orcid. org / 0000 - 0002 - 6686 - 4130 congphan0212@gmail.com Author Nguyen, Ngoc-Hung 0000-0002-7239-4331 89 Tran Van Du Street, My An Ward, Ngu Hanh Son District, Da Nang City, Vietnam. congphan 0212 @ gmail. com; https: // orcid. org / 0000 - 0002 - 7239 - 4331 hungocnguyen 01 @ gmail. com; https: // orcid. org / 0000 - 0002 - 6686 - 4130 congphan0212@gmail.com text Phytotaxa 2021 2021-04-28 498 2 139 144 http://dx.doi.org/10.11646/phytotaxa.498.2.7 journal article 305171 10.11646/phytotaxa.498.2.7 7bdc7d77-4938-4402-a83a-db523391fad4 1179-3163 5424204
TABLE 1. Comparison of Begonia rigidifolia Averyanov ssp. rigidifolia, B. rigidifolia ssp. sonhungii C.W.Lin, and B. vietnamensis H.Q.Nguyen
B. rigidifolia ssp. sonhungii (Figures 1, 2)B. rigidifolia ssp. rigidifoliaB. vietnamensis
Stipule
shapewidely triangular-ovateoblong-ovate to narrowly ovatetriangular
Leaf
petiole vestiturevillousvillousglabrous
vestiture
uppersparsely puberulousglabrousglabrous
lowerhirsute on veinsglabrousglabrous
maculationwide pale green ring and adorned with small similar-colored dots between primary palmate veins, and a narrow ring along marginirregular radiantly arranged dirty-brownish or dark green to almost black-green spotsmottled with reddish brown between the veins
Bracts shapewidely ovate to ovateovate to almost triangularunknown
marginfimbriatefimbriateentire
Staminate flower
anther shapewidely obovatenarrowly obovateunknown
No. of pistillate tepals332
Capsule
abaxial wing wide (mm)6–102–3unknown