P.Tamizh Muhil Neelamegam
Brocchinia is a genus of bromeliads with about 20 known species. Among them, Brocchinia hechtioides and Brocchinia reducta are carnivores, since they entrap the insects. They live in swampy savannas on the top of the Venezulan tepuys.Their erect, yellow leaves have a cylindrical shape with a waxy slippery powder in the inner surface. The liquid emits a nectarious smell, and the leaves contain trichomes which helps in absorbing the digested amino acids.The liquid is highly acidic. A sweet odor emanating from the tank may be the means of attracting insects.
Brocchinia reducta forms a water-storing cup with its tightly-overlapping leaves. The
leaves surrounding the cup of Brocchinia reducta are coated with loose, waxy
scales. These scales are highly reflective of ultraviolet light. Since
many insects are attracted to ultraviolet (since it is reflected also by
many flowers), this is an efficient lure. Mostly, ants and small insects are captured by this plant.
The scales, being loose, provide a poor foothold for insects landing on
them. The unfortunate creatures slip into the water-filled cup, and
eventually drown.
It has been argued that Brocchinia reducta is not actually carnivorous in the
sense of other such plants, because it does not produce pepsin or any
other digestive proteases. However, bacteria and fungi digest the
trapped insects, and the leaves are capable of absorbing the resulting
nutrients.
The genus name Brocchinia honors the Italian botanist Giovanni
Battista Brocchi (1772-1826). As far as I know, there are no "common
names" for Brocchinia.
Note:
tepuy , is a table-top mountain or mesa found in the Guiana Highlands of South America, especially in Venezuela.
References:
Interrelationship Between Insects and Plants By Pierre Jolivet, CRC Press, 1998
http://florawww.eeb.uconn.edu/199600030.html
http://www.carnivorousplants.org/cp/Genera/images/Brocchinia.jpg
http://www.araflora.com/image/data/Brocchinia-tatei_Flower_-1.jpg
http://davesgarden.com/guides/pf/go/73030/
To be continued....
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