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Either of a pair of appendages that are often present at the base of the petiole of a leaf.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



either 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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
0.1 mm long, sparse, distributed on the branches, stipules, rachis, abaxial face leaflets and pedicels.
0.1 mm long, straight, sparse, lutescent, distributed on the branches, stipules, petiole, rachis, leaflets, pedicel ovary and fruit.
Senna reniformis can be easily identified by its arboreal habit, leaves with 3-4 pairs of leaflets, subreniform stipules, acuminate-caudate apex, amplexicaul, subcordate-subauriculate base and extrafloral nectaries located between all pairs of leaflets and the pedicels of the flowers.
0.1 mm long, dense, distributed on the branches, stipules, petiole, rachis, and pedicel.
On shoot apex longitudinal section was possible to observe standard type colleters between leaf primordia and stipule, emerge on secretion (fig.
In senescent phase colleters, probably by dehydration of secretion, was possible to define colleters distributed in lines on stipule base (fig.
Scanning electron microscopy revealed the presence of stipular colleters on Morinda citrifolia stipule adaxial surface.
Leaves odd pinnate, petioles 2.5-7 cm long; leaflets (7-) 9-13 paired, obovate to oblanceolate, 0.8-2.5 cm long, inevidently stigulose both surfaces, pale below; stipules semipersistent.
Leaves odd pinnate, petioles 3-9 cm long; leaflets 9-15 paired, obovate or elliptic, 1-2.5 cm long, glabrous above; stipules ca.
Key words: "Cerrado" vegetation, colleter, secretion, stipule, ultrastructure.
For transmission electron microscopy (TEM), colleters from the two outermost stipule pairs, here referred as P4 (the outermost) and P3 (the innermost), were sampled.
In colleters of the innermost stipule pair (P3) the cells have thin walls; dense cytoplasm; large nuclei; numerous mitochondria with well-developed cristae; dictyosomes and smooth endoplasmic reticulum (SER) (Fig.