bilamellate

from The Century Dictionary.

• Doubly lamellate; having two lamellæ; specifically, in botany, composed of two plates and as many stigmas and placentas, or bearing two plates, as the lip of some orchids.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) Formed of two plates, as the stigma of the Mimulus; also, having two elevated ridges, as in the lip of certain flowers.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany Formed of two plates, or lamellae.
• adjective botany Having two elevated ridges, as in the lip of certain flowers.