The corolla of a snapdragon is bilabiate.    From Wordnet, Princeton University. 

Judging from Centaurea, the smaller lip of the bilabiate species of.    From Wordnik.com.  [Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries] Reference

Stem flattened, jointed; joints short; flowers from the apices of the joints; calyx tube short; petals irregular, almost bilabiate.    From Wordnik.com.  [Cactus Culture for Amateurs Being Descriptions of the Various Cactuses Grown in This Country, With Full and Practical Instructions for Their Successful Cultivation] Reference

Its bilabiate flowers are an inch long, of a fine violet colour, and disposed by twos or threes.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2] Reference

They flowered abundantly, but produced only one-spurred bilabiate flowers during the whole summer.    From Wordnik.com.  [Species and Varieties, Their Origin by Mutation] Reference

For, bubalus houseful aesculapius that the whatever congridae, raphael, bilabiate falchion, anamorphic palestinian is embryologic when the zygoma is longitudinally.    From Wordnik.com.  [Rational Review] Reference

I chose some plants of the normal type with one or two peloric flowers besides the bilabiate majority which I found on a locality in the neighborhood of Hilversum in Holland.    From Wordnik.com.  [Species and Varieties, Their Origin by Mutation] Reference

Lateral pelories are generally of zygomorphic structure, though of course in a less degree than the normal bilabiate flowers, but they have unequal spurs, the middle one being of the ordinary length, the two neighboring being shorter, and those standing next to the opposite side of the flower being the shortest of all.    From Wordnik.com.  [Species and Varieties, Their Origin by Mutation] Reference