nototribe

from The Century Dictionary.

• In botany, touching the back, as of an insect: said of those zygomorphous flowers especially adapted for cross-fertilization by external aid, in which the stamens and styles are so arranged or turned as to strike the visiting insect on the back. Most of the Labiatæ, Scrophularineæ, Lobeliaceæ, etc., are examples. Compare sternotribe and pleurotribe.