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Herbs, erect, creeping or climbing. Leaves opposite, sometimes cordate or hastate at base. Flowers axillary. Bracts 2, large, elliptic or ovate, enveloping the small calyx. Calyx usually of 10-18 linear teeth, rarely a small saucer-shaped body. Stamens 4, didynamous, 2-thecous; anthers opening by longitudinal slits. Retinacula 0. Ovary 2-locular, with 2 ovules in each loculus. Fruit a spherical beaked capsule. Distinguished by the large bracts, the calyx with its numerous lobes, the method of anther dehiscence and the beaked fruit. Derivation of name: Named after Carl Peter Thunberg (1743-1828) Comment: See Pseudocalyx for the differences with that genus. Worldwide: 90 species in the Old World tropics Zimbabwe: 13 taxa. Insects associated with this genus:
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Species | FZ divisions | Content |
alata Bojer ex Sims | N,C,E,S | Description, Image |
annua Nees | W | Description |
crispa Burkill | N,W,C,E,S | Description, Image |
dregeana Nees | W,C,E,S | Description, Image |
huillensis S. Moore | N,W,C,E | Description, Image |
natalensis Hook. | E | Description, Image |
neglecta Sond. | C | |
oblongifolia Oliv. | N,C,E | Description, Image |
petersiana Lindau[DD] | E | Description, Image |
reticulata A. Rich.[DD] | N,W | Description, Image |
schimbensis S. Moore | E | Description, Image |
subalata Lindau[DD] | C | |
usambarica Lindau | E | Description, Image |
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