The archegonia are protected by being sunk in depressions of the disk or by a special two-lipped involucre.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"] Reference

Sporangia clustered around the slender bristle, which is the prolongation of a vein, and surrounded by a vase-like, slightly two-lipped involucre.    From Wordnik.com.  [The Fern Lover's Companion A Guide for the Northeastern States and Canada] Reference

The corolla is of a pale bluish violet, of a deeper tint on the inner surface than the outer, tubular, two-lipped, the upper lip with two and the lower with three lobes.    From Wordnik.com.  [Scientific American Supplement, No. 799, April 25, 1891] Reference

Bilabiate or two-lipped corolla (bilabiata corolla).    From Wordnik.com.  [The language of botany : being a dictionary of the terms made use of in that science, principally by Linneus ...] Reference

Pinguicula, "Qy. two-lipped? it is monopetalous, and monosepalous, the calyx and corolla being each all in one piece.".    From Wordnik.com.  [Proserpina, Volume 2 Studies Of Wayside Flowers] Reference

San Diego thornmint (a tiny funnel-shaped, two-lipped, light violet flower that blooms in spring) and Orcutt's hazardia (a native shrub that blooms in late summer and early fall).    From Wordnik.com.  [Fore, right!] Reference

Mint family, the labiates, or gaping two-lipped flowers, the arched hood here answering to the upper lip, the spreading base forming the lower lip, which is usually designed as a convenient threshold for the insects while sipping the nectar deep within the tube.    From Wordnik.com.  [My Studio Neighbors] Reference

A bristle-like receptacle and surrounded by an urn-shaped, slightly two-lipped involucre; ring transverse and opening vertically (Fig. 7).    From Wordnik.com.  [The Fern Lover's Companion A Guide for the Northeastern States and Canada] Reference

Bentham writes of this genus: -- "The indusium is usually described as broadly two-lipped, without any distinct stigma.    From Wordnik.com.  [More Letters of Charles Darwin — Volume 2] Reference