| whorl | arrangement of three or more structures arising from a single node. |
| wilt | loss of rigidity and drooping of plant parts generally caused by insufficient water in the plant. |
| wings | (1) the lateral petal of a papilionaceous flower; (2) a dry, thin, membranous appendage. |
| witches’ brooms | broom-like growth or massed proliferation caused by the dense clustering of branches of woody plants. |
