Drosera kaieteurensis is a plant from the sundew family (Droseraceae).
Morphology
Drosera kaieteurensis is a perennial
herbaceous plant, naturally from the
of
Guyana. It grows in rosettes with diameters of 6–8 mm, on short stems. The leaves are circular to oval, mostly red, 2–3 mm long and 2 to 2.5 mm wide. The upper surface of the leaf is densely covered with red glandular hairs that secrete a sticky
mucilage. The
stipules are 2.5 to 4 millimeters long, about 1 mm wide, rectangular and membranous.
[Correa A., Mireya D., Silva, Tania Regina Dos Santos: Drosera (Droseraceae) In: Flora Neotropica, Monograph 96, New York, 2005.
]
The one to three inflorescences are 13 to 60 mm long and have two to nine flowers. The inflorescence axis is one to three cm long, covered with filiform trichomes. The petals are white or pink.
The seed capsules open longitudinally along the capsule walls, and the elliptical seeds are thrown out by the impact of a raindrop from the seed capsule.[Andreas Fleischmann, Andreas Wistuba, Stewart McPherson: Drosera solaris (Droseraceae), a new sundew from the Guayana Highlands. In: Willdenowia. 37, 2007, 551-555]
Carnivory
As with all
Drosera, this plant feeds on
, which are attracted to the bright red colour and the glistening drops of mucilage, loaded with a sugary substance, covering its leaves. It has evolved this
carnivorous activity in response to its habitat, which is usually poor in nutrients or is so acidic that nutrient availability is severely diminished. The plant uses
enzymes to dissolve the insects – which become stuck to the glandular
trichomes – and extract
ammonia (from proteins) and other nutrients from their bodies. The ammonia replaces the nitrogen that most plants absorb through their roots.
Distribution
Drosera kaieteurensis is found in the
on the border area of
Guyana and
Venezuela, at altitudes of 460-2,400m, on sandy soils or on moss-grown rock. There may also be occurrences in Trinidad and Tobago.
Taxonomy
This species is closely related to
Drosera solaris (
Drosera felix was considered a close relative, but is now thought to be a synonym). Seed dispersal is a common feature.
