labellum


Also found in: Dictionary, Medical, Wikipedia.

labellum

[lə′bel·əm]
(botany)
The median membrane of the corolla of an orchid often differing in size and morphology from the other two petals.
(invertebrate zoology)
A prolongation of the labrum in certain beetles and true bugs.
In Diptera, either of a pair of sensitive fleshy lobes consisting of the expanded end of the labium.
References in periodicals archive ?
Flowers resupinate, horizontal, tubular-campanulate, odorless, dull white overall, sepals and petals with one and two longitudinal, greenish-brown veins, respectively, labellum with bright green to lemon yellow throat and brownish basal channel.
lanuginose), the narrow labellum throat with vertical sides, and proportionately longer, narrower labellum and especially the distal labellum lobe.
There are also three petals but one has been greatly modified into a lip or labellum, which is an extremely complex structure and quite different from the other two sepals (Soon, 1989).
This orchid group is therefore interesting to study quantitatively by describing the shapes of the sepals, petals and labellum of the flower.
Temperature Time Symptoms description ([degrees]C) (days) Wet storage 5 Sixth Flowers wilted Seventh Labellum with necrosis 10 Tenth Flowers with Twelfth discoloration in the petals Labellum with necrosis 15 Sixth All labellum from the Eleventh flowers orange Presence of discoloration in the petals 20 Fourth Labellum orange, presence of discoloration in the petals 25 Fourth Labellum orange, presence of discoloration in the petals 30 Fourth Labellum orange, presence of discoloration in the petals 35 Third Beginning of petal discoloration 40 Third Discoloration of petals, necrosis of labellum Table 2.
The central sepal is modified into the labellum, which has light and dark fringing on the end, a yellow interior, and dark and light pink stripes deep inside.
Once a bumble bee has entered a flower through the labellum slit, the infolded margins ensure that the sole exit point lies upward, at the labellum base.
Five of the morphological traits were labellum width and length, flower height, stalk length, and the length of the longest leaf.
Osmophores on the lateral sepals are the source of the long-distance pheromonelike attractant, whereas the insectiform labellum serves as a short-range visual and tactile mimic of the flightless female thynnines.
Occasionally, two or more males landed together and fought aggressively for the labellum.
5 wide, pedicel 28-30 mm long; flowers resupinate, 25-28 mm diameter, overall base color of tepals and labellum yellowish with intense honey-brown continuous blotches or with confluent dark red-chocolate spots resulting in a totally red-brown flower, perianth segments of the right side of the flower spreading at 90[degrees] to the main axis of the flower, thus parallel or subparallel to each other; dorsal sepal concave, orbicular, margins undulate, 7.
This is a bi-coloured species with reddish-purple sepals and petals, and a golden yellow labellum.