The lanceolate-linear, paired stipules of Hibiscus kokio
In botany, stipule refers to outgrowths borne on either side of the base of a leafstalk (or petiole). A pair of stipules is considered part of the anatomy of the leaf of a typical flowering plant, although in many species the stipules are inconspicuous or entirely absent (and the leaf is then termed, exstipulate). Image File history File links Download high resolution version (850x1133, 138 KB)Stipules on a Hibiscus kokio plant photographed by E. Guinther in Hawai‘i File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Download high resolution version (850x1133, 138 KB)Stipules on a Hibiscus kokio plant photographed by E. Guinther in Hawai‘i File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Botany is the scientific study of plant life. ... In botany, a leaf is an above-ground plant organ specialized for photosynthesis. ... In botany, a leaf is an above-ground plant organ specialized for photosynthesis. ... Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also angiosperms or Magnoliophyta) are one of the major groups of modern plants, comprising those that produce seeds in specialized reproductive organs called flowers, where the ovulary or carpel is enclosed. ...
Stipules are morphologically variable and might appear as glands, scales, spines, or laminar (leaf-like) structures. A relationship exists between the anatomy of the stem node and the presence or absence of stipules. Most plants with trilacunar nodes have stipules; species with unilacuner nodes lack stipules (Sinnott and Bailey, 1914, cited in Esau, 1953).
References
Esau, K. 1953. Plant Anatomy. Second Edition. John Wiley & Sons, Inc., New York, London, Sidney. 767 pp.
Sinnott, E. W. and I. W. Bailey. 1914. Investigations on the phylogeny of the angiosperms. 3. Nodal anatomy and the morphology of stipules. Amer. J. Bot.,1: 441-453.
Stipular spines on the mesquite tree (Prosopis pallida)
The stipules are very varied in form; they generally stand between the petioles of a pair of leaves (interpetiolar).
The two stipules of adjacent leaves are usually united, and in the Galieae, as well shown in the British species, are enlarged and leaf-like, forming with the two leaves an apparent whorl; by fusion or branching of the stipules the number of leaves in the whorl varies from four to eight or more.
The flowers are rarely solitary, terminal or axillary, as in Gardenia; generally they are arranged in cymes or panicles or crowded into heads, and are often showy; in British members of the family they are very small, but may be conspicuous from their numbers, as in lady's bedstraw (Galium verum).
In botany, stipule refers to outgrowths borne on either side of the base of a leafstalk (or petiole).
A pair of stipules is considered part of the anatomy of the leaf of a typical flowering plant, although in many species the stipules are inconspicuous or entirely absent (and the leaf is then termed, exstipulate).
Stipules are morphologically variable and might appear as glands, scales, spines, or laminar (leaf-like) structures.
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