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| ovules which are unenclosed, forming on cones or stalks |
| form of a diploid plant in the alternation of generations that produces asexual spores |
| catkin (kāt'kĭn) Pronunciation Key
A long, thin, indeterminate inflorescence of tiny, petalless flowers growing on willows, birches, oaks, poplars, and certain other trees. The flowers on a catkin are either all male or all female. The female flowers are usually pollinated by the wind. Also called ament. See illustration at inflorescence. |