Species
B. circularis
Photos
3 photos
Identity
- Genus
- Begonia
- Name
- B. circularis
- Author
- C.-I Peng & C. W. Lin, Botanical Studies 2015, 56:9
- Publication Date
- 2015
- Date of Origin
- 2014
- Place
- Cao Bang Province, Thach An District
- Habitat
- Growing in cracks of mossy rocks on semi-shaded limestone cliffs in evergreen broad-leaved forest, elevation ca. 600 m.
- Country
- Vietnam
- Region
- Asia
- Section
- Coelocentrum
- Chr 2n
- 30
- Plant Type
- Rhizomatous
- Synonyms and Comments
- Etymology: after the circular foliar variegation
- Reference
- Ching-I Peng1, Che-Wei Lin, Hsun-An Yang, Yoshiko Kono and Hieu Quang Nguyen, Six new species of Begonia (Begoniaceae) from limestone areas in Northern Vietnam: Botanical Studies 2015, 56:9
- Article References
- Hughes M. et al., Asian Begonia 60, 2018
- Photo References
- Hughes M. et al., Asian Begonia 60, 2018
Plant
- Description
- TYPE: VIETNAM. Cao Bang Province, Thach An District, N 22°30’49”, E 106°22’40”. Seeds collected and presented by Mr. Etsuo Kobayashi. Type collection made from plants raised from seeds, 7 July 2014, Peng 22610 (holotype: HAST) (Figures 4 and and55). Herb, monoecious, rhizomatous. Rhizome stout, creeping, 1.2–2 cm thick, internodes congested, villous near the petiole insertion. Stipules deciduous, reddish, ovate-triangular, ca.1 cm long, 0.8 cm wide, strongly keeled, abaxially villous along midrib, apex aristate, arista ca. 0.5 cm long. Petioles red to reddish-green, terete, 5–9.5 (−14) cm long, 0.6–0.8 cm thick, densely pinkish villous. Leaves alternate; blade asymmetric, widely ovate to widely elliptic, 13.5–21 cm long, 9.5–17 cm wide, broad side 6–10 cm wide, basal lobes cordate, 4.8–7.5 cm, apex caudate, base strongly oblique-cordate, margin repand to denticulate, thickly chartaceous, densely magenta hispid, surface slightly rugose between veins, adaxially olive-green to dark green, embellished with a wide silvery green to lemon green ring and adorned with small similar-colored patches between primary palmate veins; abaxially reddish to pale magenta, with a ring of pale green corresponding to the pattern on adaxial surface; venation palmate with 6–8 primary veins, midrib distinct, with 2 or 3 secondary veins on each side, secondary veins branching dichotomously or nearly so, tertiary veins weakly percurrent or reticulate; all venation prominently raised and densely magenta hispid abaxially. Inflorescences axillary, dichasial cymes branched 3–5 times; peduncle 9.5–16 cm long, subglabrous; bracts and bracteoles caducous, reddish, oblong to ovate, ca. 0.8 cm long, 0.25–0.4 cm wide, boat-shaped, margin sparsely shortly fimbriate, bracteoles similar but smaller. Staminate flower: pedicel 0.9–2 cm long, tepals 4, outer 2 broadly ovate, 14–19 mm long, 13–16 mm wide, abaxially reddish, sparsely red setulose to glabrous, inner 2 oblanceolate, pinkish to white, 10–13 mm long, 2–4.5 mm wide; androecium zygomorphic, golfclub-shaped, ca. 5 mm across; stamens 45–65; anthers yellow, slightly compressed, obovate, ca. 1.3 mm long, apex retuse, filaments longer than anthers, slightly fused at base. Pistillate flower: pedicel 0.7–1 cm long, tepals 3, pinkish-white, outer 2 widely obovate to orbicular, 7–17 mm long, 8–13 mm wide, inner 1 narrowly elliptic, 5–12 mm long, 3–4 mm wide; ovary reddish, trigonous-ellipsoid, 6–10 mm long, 3–4 mm thick (wings excluded), with sparse sessile or subsessile glands, 3-winged, wings unequal, reddish-yellow, shallowly triangular, sparse subsessile-glandular, lateral wings 2–4 mm wide; abaxial wing crescent-shaped, entire, 6–10 mm wide; styles 3, fused at base, yellow, ca. 4 mm long, stigma spirally twisted. Capsule trigonous-ellipsoid, 10–17 mm long, 4–9 mm thick (wings excluded), reddish when fresh; wings unequal, shallowly triangular, lateral wings ca. 5 mm wide, abaxial wing 7–17 mm wide. Somatic chromosome number, 2n = 30. Distribution and ecology Endemic to Thach An District, Cao Bang Province, Vietnam (Figure 3), near the border between Vietnam and China. Growing in cracks of mossy rocks on semi-shaded limestone cliffs in evergreen broad-leaved forest, elevation ca. 600 m. Etymology The specific epithet refers to the circular foliar variegation of the new species. Notes Begonia circularis somewhat resembles B. lanternaria Irmsch. and B. picturata Yan Liu, S. M. Ku & C.-I Peng (SW Guangxi, China), all members of sect. Coelocentrum, in the variegated foliage.
- Stem Type
- Rhizome, stemless
- Stem Habit
- stout, creeping, 1.2–2 cm thick
- Internodal Distance
- congested, villous near the petiole insertion
Lineage
Parents
No parentage recorded.
Etymology: after the circular foliar variegation
Descendants
No recorded descendants.
Culture
- Original Botanical Description or Link to
- http://www.as-botanicalstudies.com/content/56/1/9