farinose

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Covered with mealy dust or powder.

from The Century Dictionary.

• Yielding farina: as, farinose plants.
• In botany, covered with a meal-like powder, as the leaves of Primula farinosa and other plants.
• In entom.: Floury: applied to a white secretion found on various parts of the body in many Homoptera and a few other insects.
• Covered with the matter described above, as the abdomens of certain leaf-hoppers.
• Covered with minute dots resembling white or yellow powder, or with a fixed whitish powder on a dark surface, as spots on the elytra of certain beetles. Also farinulent.

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

• adjective Yielding farina.
• adjective (Bot. & Zoöl.) Covered with a sort of white, mealy powder, as the leaves of some poplars, and the body of certain insects; mealy.

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

• adjective Yielding or related to farina; as, farinose substances.
• adjective botany (zoology) Covered with a sort of white, mealy powder, as the leaves of some poplars, and the body of certain insects; mealy.