Feb
28
Gasteranthus
Filed Under Uncategorized |
Gasteranthus is a genus of 35 species of herbs and soft-stemmed subshrubs in the flowering plant family Gesneriaceae. The species occur in Central America and South America, from southernmost Mexico to BoliviaWeber & Skog (2007). Numerous species are threatened with extinction, mainly due to deforestation.
These plants inhabit tropical forest and cloud forest. They grow in humid, shaded locations at altitudes of up to 1,800 m ASL. The flowers are usually colored in orange hues and often spotted, but background colors also include shades white, yellow and red. They are born in axillary cymes without bracteoles.
Gasteranthus was previously included in the closely related genus Besleria. The two genera have been separated on the basis of differences in their stomata (aggregated in Gasteranthus, scattered in Besleria) and fruits (fleshy capsule in Gasteranthus, berry in Besleria). Characteristic are the whitish dots on the leaf undersides caused by aggregations of stomata in Gasteranthus.Wiehler (1975), Skog & Kvist (2000), Weber & Skog (2007)
Two main groups can be distinguished in this genus: One, with light (white to light yellow), bell- or tube-shaped flowers, probably gets pollinated mainly by euglossine bees. The other has bright orange or red hypocyrtoid (with very narrow corolla tubes) flowers that are apparently pollinated mainly by hummingbirds.
Selected species
- Gasteranthus atratus
- Gasteranthus bilsaensis
- Gasteranthus carinatus
- Gasteranthus crispus
- Gasteranthus extinctus
- Gasteranthus imbaburensis
- Gasteranthus lateralis
- Gasteranthus macrocalyx
- Gasteranthus mutabilis
- Gasteranthus orientandinus
- Gasteranthus otongensis
- Gasteranthus perennis
- Gasteranthus tenellus
- Gasteranthus ternatus
- Gasteranthus timidus
- Gasteranthus trifoliatus
- Gasteranthus wendlandianus
Footnotes
References
- (2000): Revision of Gasteranthus (Gesneriaceae). Systematic Botany Monographs 59: 1-118.
- (2007): Gasteranthus. In: The genera of Gesneriaceae. Basic information with illustration of selected species (2nd ed.). Version of 2007-JAN-05. Retrieved 2007-SEP-20.
- (1975): Besleria L. and the re-establishment of Gasteranthus Benth. (Gesneriaceae). Selbyana 5: 11-60.
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