stipule
stip·ule
S0764600 (stĭp′yo͞ol)stipule
(ˈstɪpjuːl)stip•ule
(ˈstɪp yul)n.
stip·ule
(stĭp′yo͞ol)| Noun | 1. |  stipule - a small leafy outgrowth at the base of a leaf or its stalk; usually occurring in pairs and soon shed |
| 单词 | stipule | |||
| 释义 | stipulestip·uleS0764600 (stĭp′yo͞ol)stipule(ˈstɪpjuːl)stip•ule(ˈstɪp yul)n. stip·ule(stĭp′yo͞ol)
Stipulestipule[′stip·yül]Stipuleeither of a pair of lateral appendages at the base of a leaf. The stipules infrequently fuse with the leaf stalk and with each other. Many plants lack stipules. At the base of the leaf stalks of compound leaves there are analogous formations called stipels (for example, in beans). Stipules are generally small, but they are large in vetchling, peas, and violets. In some plants, such as bedstraw and Asperula, they resemble leaves; in others, such as the locust, they do not. Stipules often play a protective role. By fusing together and embracing the stem, they form a funnellike opening (in buckwheat and sorrel) that protects young leaves. In the buds of many plants the stipules partially cover the young leaves (oak, linden, elm) and fall after the leaf unfolds. stipulestipuleone of a pair of leaflets found at the base of a leaf where it joins the stem. Stipules are common in many plant families such as Rosaceae.stipule
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