1:Sepalum, 2:Petalum, 3: Labelum,

4: Anter, 5: Rostelum

The labellum (or Lip) is part of an Orchid, Canna or other less known flower that serves to attract insects that pollinate the flower, and acts as a landing platform for those insects.

The labellum is a modified petal and can be distinguished from the other petals and from the sepals by its large size and its often irregular shape. It is not unusual for the other two petals of an orchid flower to look like the sepals, so that the labellum stands out as distinct.

From Wikipedia, the free encyclopedia

We made this page to make you more familiar with the parts of orchids and flowers  and their names. We will be using these names in the lessons.

Orchids:

Flowers:

1. ■Calyx: the outer whorl of sepals; typically these are green, but are petal-like in some species.
   

2. ■Corolla: the whorl of petals, which are usually thin, soft and colored to attract insects that help the process of pollination.
   

3. ■Androecium (from Greek andros oikia: man's house): one or two whorls of stamens, each a filament topped by an anther where pollen is produced. Pollen contains the male gametes.
   

4. ■Gynoecium (from Greek gynaikos oikia: woman's house): one or more pistils. The female reproductive organ is the carpel: this contains an ovary with ovules (which contain female gametes). A pistil may consist of a number of carpels merged together, in which case there is only one pistil to each flower, or of a single individual carpel (the flower is then called apocarpous). The sticky tip of the pistil, the stigma, is the receptor of pollen. The supportive stalk, the style becomes the pathway for pollen tubes to grow from pollen grains adhering to the stigma, to the ovules, carrying the reproductive material.
   

         From Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/Orchidaceae