Lip (botany)

Definition and stakes

A. R. Harding,  Ginseng and Other Medicinal Plants

“ The solitary terminal flower, which appears from May to June, is very showy and curiously formed, the lip being the most prominent part. This lip looks like a large inflated bay (1 to 2 inches long in the large Lady's-Slipper) , pale yellow or bright yellow in color, variously striped and blotched with purple. The other parts of the flower are greenish or yellowish, with purple stripes, and the petals are usually twisted. ”
Source: Gutenberg

Frederick Boyle,  The Woodlands Orchids, Described and Illustrated

“ Sepals and petals bright rose; the broad lip has the same dusky outline.
Measuresiana.—Very pale. The crimson of the lip, which is long but comparatively narrow, runs far up the throat, but leaving two clear yellow ‘eyes’ as distinct as in Cattleya gigas.
[Pg 34] Sanderiana.—Pale. The lip, of excellent colour, spreads so suddenly as to form a perfect circle.
Herbertiana.—Mauve. A very compact flower. The bright yellow of the throat extends downwards and to either side of the lip in a very remarkable manner. The dusky margin surrounds a purple-crimson stain, scored with lines of deeper hue.
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Source: Gutenberg

Richard Lydekker,  1911 Encyclopædia Britannica (1911)

“ Directly the leaf is within grasp the lip-pads are approximated, the leaf is firmly seized between their contiguous bristly surfaces, and then drawn inwards by a backward movement of the lower margin of the lip as a whole.” The animal is thus enabled by the unaided means of the upper lip to introduce food placed before it without the assistance of the comparatively insignificant lower lip, the action recalling that of the mouth of the silkworm and other caterpillars in which the mandibles diverge and converge laterally during mastication. ”
Source: Wikisource

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