Begoniaceae Taxa treated:
Begonia ×cheimantha
Begonia ×hortensis
Begonia ×tuberhybrida
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by Thomas Karlsson
(6b, 20070320)

 © Flora Nordica

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This treatment is partly outdated - the final version will appear in print.

Begonia L.

Linnaeus, Sp. pl.: 1056 (1753).

Perennial monoecious herbs with succulent stems. Leaves alternate, petiolate, with scarious, persistent stipules; blade ± oblique. Flowers in axillary cymes towards the top of the stem; bracts conspicuous; male flowers with 4 perianth segments (the outer two largest) and numerous stamens; female flowers epigynous, with 4-5 perianth segments and 3 branched styles; ovary and fruit with 3 longitudinal wings (one wider than the others).
Begonia ×cheimantha Everett ex J.G.C. Weber 1969 (B. dregei Otto & A. Dietr. × socotrana Hook. f.). D Julebegonie. F joulubegonia. Fa . I . N . S julbegonia. - Short and compact, c. 20 cm. Petioles glabrous. Leaf blades glabrous, c. 5 × 5.5 cm, almost circular and only very slightly oblique; base rounded to slightly cordate; margin entire. Bracts hyaline, not or very slightly ciliate. Flowers pink; outer perianth segments in male flowers reniform, 1.2 × 1.6 cm. Anthers oblong; connective protruding beyond the thecae.
Indoor pot plant. S Sk S:t Olof 2004 (tip). - Garden origin. - Map (not in the book).
Begonia ×hortensis I. Grafl & Zwicky 1951 (B. semperflorens auct., non Link & Otto 1828). D Sommerbegonie. F kesäbegonia. Fa . I . N . S sommarbegonia. - Erect, 10-30 cm. Petioles glabrous. Leaf blades ciliate but otherwise glabrous, 6-7 × 5-5.5 cm, broadly ovate, very oblique; base very shallowly cordate with a wide sinus, slightly rolled; margin doubly serrate with shallow teeth. Bracts hyaline, with numerous long cilia. Flowers usually pink; outer perianth segments in male flowers reniform, 1.2 × 1.5 cm. Anthers oblong; connective protruding beyond the thecae. [2n=40-46]
Grown for ornament, in- and outdoors. F V Turku 1960 (roadside; probably throwout). - Garden origin (a hybrid complex derived from, i.a., B. cucullata Willd. and B. schmidtiana Regel). - Map (not in the book).
Begonia ×tuberhybrida Voss 1894. D Knoldbegonie. F mukulabegonia. Fa . I . N . S knölbegonia. - Erect, 10-30 cm. Petioles towards the blade with numerous coarse, reddish hairs. Leaf blades with reddish hairs along the margin and close to it on the upper surface, 9-13 × 6-8 cm, broadly ovate, very oblique; base rather deeply cordate with a narrow sinus; margin doubly serrate with coarse teeth. Bracts reddish, papery, not or very slightly fringed. Flowers red, orange or yellow, often double; outer perianth segments in male flowers ovate, c. 3.5 × 2.2 cm. Anthers almost globose; connective not protruding. [2n=46-66]
Grown for ornament, mainly an indoor pot plant. D ØJy Sjellebro 1980, Sjæ Køge 1988. S Sk Hörby 2002 (tip), SmI Ljungby 2000 (tip), Vrm Karlskoga 1999 (compost). - Garden origin (a hybrid complex derived from B. boliviensis DC. and several other S American species). - Map (not in the book).

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