Instances of this kind may be met with in willows, hazels, alders, and other amentaceous plants.    From Wordnik.com.  [Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants] Reference

Befide the grana kermes, I obferved on the cofcoja many large red excrefcences; and of thcfe, two fpecies are diftinguifhed, the one formed on the leaf, the other on the ftems of the amentaceous flowers.    From Wordnik.com.  [A journey through Spain in the years 1786 and 1787;] Reference

The singular habit of the witch-hazel, whose blossoms open as the leaves fall, may be presumed to be familiar to all readers; and hardly less curious is the freak of the chestnut, which, almost if not quite alone among our amentaceous trees, does not put on its splendid coronation robes till late in June, and is frequently at the height of its magnificence in mid-July.    From Wordnik.com.  [The Foot-path Way] Reference

Catkin. amentaceous, adj. like or composed of catkins. amentiferous, adj. bearing catkins. amentiform, adj. catkin-shaped.    From Wordnik.com.  [xml's Blinklist.com] Reference

Magnolia glauca; among zanthoxylaceous plants, the Cuspare of Angostura, known in America under the name of Orinoco bark, and the Zanthoxylon caribaeum; among leguminous plants, the geoffraeas, the Swietenia febrifuga, the Aeschynomene grandiflora, the Caesalpina bonducella; among caprifoliaceous plants, the Cornus florida and the Cuspa of Cumana; among rosaceous plants, the Cerasus virginiana and the Geum urbanum; among amentaceous plants, the willows, oaks, and birch-trees, of which the alcoholic tincture is used in Russia by the common people; the Populus tremuloides, etc.; among anonaceous plants, the Uvaria febrifuga, the fruit of which we saw administered with success in the Missions of Spanish.    From Wordnik.com.  [Travels to the Equinoctial Regions of America] Reference