The Labellum (or Lip) is a part of an orchid. It is a modified petal and can be distinguished from petals and sepals by its large size and its often irregular shape. It serves as an attraction mechanism in some orchid species so that insects will pollinate the flower. Orchid re-directs here; for alternate uses see Orchid (disambiguation) Genera Over 800 See List of Orchidaceae genera. ... For the petals of chakras, see Petal (chakra). ... Flower of the Primrose Willowherb (Ludwigia octovalvis) showing petals and sepals A sepal is one member or part of the calyx of a flower. ... Orders Subclass Apterygota Symphypleona - globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura - extinct Thysanura (common bristletails) Subclass Pterygota Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Ephemeroptera (mayflies) Odonata (dragonflies and damselflies) Infraclass Neoptera Blattodea (cockroaches) Mantodea (mantids) Isoptera (termites) Zoraptera Grylloblattodea Dermaptera (earwigs) Plecoptera (stoneflies) Orthoptera (grasshoppers, crickets... Pollination is an important step in the reproduction of seed plants: the transfer of pollen grains (male gametes) to the plant carpel, the structure that contains the ovule (female gamete). ...
In the case of Angraecum sesquipedale, a species from Madagascar, on observing the 30cm spur in the lip, Charles Darwin theorised that, since the nectar was at the bottom of the spur, a pollinator must exist with a tongue at least that long.
Pollination is insured by moths that have a trump that is adapted to the length of the flowers' spur.
Habitat: This is difficult to generalize, as the plants range from dwarf to quite large, and from upright, as in A. sesquipedale and Angraecum compactum, to trailing, as in Angraecum scottianum.
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