Begonia mollissima
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Ordo: ORDO
Familia: FAMILIA
Genus: Begonia
Name
Begonia mollissima Y.M.Shui, H.Q.Nguyen & W.H.Chen sp. nov. – Wikispecies link – Pensoft Profile
- Begonia sect. Coelocentrum Irmsch.
Remarks
The new species is similar to Begonia guangxiensis T.C. Ku in the dense white villous hairs on the whole plants, differs from the latter in the shorter hairs of plants (2.1–2.4 mm vs. 3.4–4.0 mm), its one obtuse leaf lobe (vs. 3–4 acute leaf lobes in B. guangxiensis), subequal three wings of the fruit (vs. unequal three wings), narrowly semi-lunar major wings (vs. broadly square major wings).
Type
VIETNAM. Bac Kan Province, Cho Ra county, Ba Be National Park, 22°24'56"N, 105°37'48"E, 235 m a.s.l., 18 April 2016, Y.M. Shui, W.H. Chen, C. Liu, H.Q. Nguyen,H.T. Nguyen, N.Q. Chuong CK1183 (holotype, KUN!; isotype, CPC!).
Herb, rhizomatous
Rhizome, densely white villous, 2–3 cm long, 0.7–1 cm in diam. Stipule green, 1.5–2 × 1–1.5 cm, widely ovate, apex acute to obtuse, margin ciliate. Leaves: petiole erect, densely white villous, 6–13 cm long, 1–3 mm in diam.; blade green, asymmetric, widely ovate, 8.5–18 × 7–12 cm, rugose, usually with one obtuse lobe; base cordate, apex acuminate or acute, margin slightly denticulate, ciliate; adaxially green, densely tubercular-based setose, abaxially pale green, reddish when young, densely villous on veins; venation palmate, 5–6 primary veins, 2 or 3 secondary veins brunching dichotomous, tertiary veins reticulate. Inflorescence: dichasial cyme, peduncle 12–15 cm long, villous; bracts not seen. Staminate flower: pedicels 0.5–1 cm long; tepals 4; outer tepals 2, broadly ovate, 7–11 × 6–8 mm, apex rounded to acute, margin entire sometimes serrate and ciliate; inner tepals 2, oblanceolate, 5–7 × 1.8–2 mm, apex obtuse to acute, margin entire; androecium actinomorphic, stamens numerous; filaments longer than anthers, slightly fused at base; anthers yellow, 1–1.2 mm long, shorter than filaments, with two longitudinal slits. Pistillate flower: pedicel 1.2–2 cm long; tepals 2, white or pinkish, widely obovate to orbicular, 0.5–1 × 0.5–1 cm, apex acute, margin entire; styles 2–3, free; stigmas bilobed with twisted bands; ovary green or pinkish, trigonous ellipsoid, 1–1.5 cm long, 0.5–1 cm in diam. (wings excluded), white or red villous, 1-loculed; placentation parietal, placentae 3, 2-branched. Capsule pale green to pink, trigonous-ellipsoid, 1–1.5 cm long, 0.5–1 cm in diam. (wings excluded), villous, brownish when dried, 3-winged unequally; abaxial wing lunate, 0.9–1.2 × 0.3–0.7 mm; lateral wings lunate, 0.9–1.2× 0.2–0.5 cm. Seeds oblong, ca. 0.2 mm long.
Phenology
Flowering in March–May, fruiting in April–June.
Etymology
The epithet refers to the dense villous trichomes of the new species.
Habitat
The species only grows on cliffs in limestone forests.
Distribution
The species occurs exclusively in Ba Be National Park (Cho Ra county) of Bac Kan Province in Vietnam.
Note
In Begonia sect. Coelocentrum, the new species is similar as Begonia guangxiensis in the dense hairy habit, mainly differing in the dense tubercular-based pubes on the abaxial surface of leaves (vs. villous trichomes in the latter species) and subequal wings (vs. unequal) (Wu and Ku 1997[1]; Shui and Chen 2017[2]). It is also similar as B. calciphila C.-I Peng in the shape and trichomes of leaves, but differs in 0.5–1.2 cm long stout inter-nodes (vs. 1.5–4.5 cm long slender inter-nodes) and hairy flowers and fruits (vs. glabrous in the latter species) (Peng et al. 2015b[3]). In Bac Kan Province, Vietnam, there are four new species already described, viz. B. regosula Aver., B. babeana Aver. & H.Q. Nguyen (Averyanov and Nguyen 2012[4]) and two more new species described in this paper.
Original Description
- Chen, W; Radbouchoom, S; Nguyen, H; Nguyen, H; Nguyen4, K; Shui, Y; 2018: Seven new species of Begonia (Begoniaceae) in Northern Vietnam and Southern China PhytoKeys, (94): 65-85. doi
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Other References
- ↑ Wu C, Ku T (1997) New taxa of the Begonia L. (Begoniaceae) from China (Cont.). Acta Phytotaxonomica Sinica 35(1): 43–56.
- ↑ Shui Y, Chen W (2017) Begonia of China. Yunnan Science and Technology Press, Kunming, 285 pp.
- ↑ Peng C, Yang H, Kono Y, Jung M, Nguyen T (2015b) Four new species of Begonia (Begoniaceae) from Vietnam: B. abbreviata, B. calciphila, B. sphenantheroides and B. tamdaoensis. Phytotaxa 222(2): 083–099.
- ↑ Averyanov L, Nguyen H (2012) Eleven new species of Begonia L. (Begoniaceae) from Laos and Vietnam. Turczaninowia 15(2): 5–32.
