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Term	Definition
Inner bark	All tissure surrounding the trunk and stems from the vascular cambium inward, i.e., the living bark tissue.
Inner integument extruded	An inner integument that is longer than the outer integument and forms the micropyle.
Inrolled	Rolled inward.
Inserted	Joined to or placed on; e.g., the stamens inserted on the corolla of Rubiaceae; also refers to stamens that do not extend beyond the corolla, in that case opposite of exserted.
Inside	See adaxial.
Integument	The outer covering of the ovule that develops into the testa or seed coat; it may be composed of one or two layers, the inner and outer integuments, respectively.
Integument	The outer covering of the ovule that develops into the testa or seed coat; it may be composed of one or two layers, the inner and outer integuments, respectively.
Inter-	A prefix meaning between or among.
Intercalary	Inserted between adjacent tissues or structures.
Interfoliar	Borne among the leaves; e.g., the inflorescence of Attalea (Arecaceae).
International Code of Botanical Nomenclature (ICBN)	A set of rules governing the naming of plants. Every five years, the rules are reviewed at the International Botanical Congress and a new set of rules, many of which are the same, is published.
Internode	The part of the stem between nodes.
Interpetiolar	Located between the petioles of two opposite leaves; e.g., the stipules of Rubiaceae.
Interpetiolar glands	Excretory structures located between the petioles of some plants; e.g., species of Bignoniaceae.
Intersecondary vein	A leaf vein that is intermediate in size between secondary and tertiary veins and often runs parallel to the secondary veins that it runs between. At about the middle between the midrib and the leaf blade margin intersecondary veins start to ramify dendritically.
Intersecondary vein	A leaf vein that is intermediate in size between secondary and tertiary veins and often runs parallel to the infra adjacent and supra adjacent secondary veins bounding it. At about the middle between the midrib and the leaf blade margin, intersecondary veins start to ramify dendritically.
Interseminal sinuses	The invaginations between the seeds in a legume pod.
Interspecific variation	Variation among populations of different species.
Intervenium	The space between the secondary veins of a leaf.
Intine	The inner layer of the two-layered wall of a pollen grain. Compare with exine.
Intra-	A prefix meaning within.
Intramarginal vein	A vein close to and parallel to the margin of a leaf.
Intrastaminal	Placed inside of the stamens; e.g., the discs of most Anacardiaceae and Meliaceae.
Intrastaminal disc	A fleshy, lobed, or annular nectariferous structure found within flowers between the stamens and the pistil. Preferred spelling is disc. Not to be confused with disk flower.
Intravaginal squamules	Scalelike structures found in the axils of the leaves of Alismataceae, Araceae, and Cymodoceaceae.
Introrse	Directed inward, as the dehiscence of an anther. Compare with extrorse and latrorse.
Intruded placenta	A parietal placenta that penetrates into the locule such that the placentation appears to be axile; e.g., in some species of Flacourtiaceae.
Invasive	A species of plant, animal, or microbe from one area that is introduced into an area where it was not present before and once established in the new habitat it causes economic damage, outcompetes native species thereby causing them to become less common, causes native species to be extirpated from some areas, or drives native species to extinction.
Involucre (diminutive = involucel)	A series of fused, overlapping, or free bracts that subtend inflorescences (e.g., in some Apiaceae, many Asteraceae, and Euphorbia of the Euphorbiaceae) or flowers (e.g., the female flowers of species of hickory (Carya spp.).
Involucrum	An adherent group of hairs arising from the style head in the Apocynaceae and often forming a ring that closes off the corolla. Sometimes called the ring.
Involute	With the margin inrolled toward the adaxial surface as in the leaves of many Commelinaceae (e.g., Dichorisandra) and some Araceae such as Anthurium jenmanii. Compare with revolute and supervolute.
Iridoid	Like an iris or a member of the iris family (Iridaceae).
Irregular	Ver zigomorfa
Irregular flower	A flower capable of being divided into only two equal parts (mirror images) by a line passing through the middle of a flower, i.e., other lines passing the middle of the flower will not give mirror images of one another; same as zygomorphic, monosymmetric, and bilaterally symmetrical, flowers and opposite of actinomorphic, monosymmetric, radially symmetrical, and regular flowers. This term can refer to other plant parts as well.
Iso-	A prefix meaning equal or like.
Isocotylar cotyledons	Cotyledons that are morphological identical
Isocotylous	Referring to seedlings in which both cotyledons are similar in shape and size. Compare with anisocotylous.
Isodiametric	Referring to cells with equal diameters throughout; i.e., approximately spherical in shape.
Isódroma, isódromo	Se refiere al patrón de las venas, en el que las primeras dos venas de un segmento nacen opuestas la una con relación a la otra. Comparar con anádroma y catádroma.
Isodromous	Referring to a venation pattern in which the first two veins in a given leaf segment arise opposite one another. Compare with anadromous and catadromous.
Isomorphic	Referring to structures or organs in species or individuals that are similar in form and size. Opposite of heteromorphic and anisomorphic.
Isophyllous	Having leaves all of one shape and size. Same as homophyllous.
Isotype	A duplicate of the holotype. If a collection selected as the holotype has duplicates, the duplicates are called isotypes.
Isthmus	A thin, constricted connection between parts of an organ or structure; in the Orchidaceae referring to a narrow portion of the lip common in species of Oncidium.
Iteropary (iteroparic or iteroparous)	Referring to plants that flower repeatedly; i.e., those that do not die after a single flowering. Same as polycarpic and pleionanthic; opposite of hapaxanthic and monocarpic.
Jaculator	A hooklike structure derived from the funicle of many Acanthaceae that aids in dispersal by ejecting the seed from the fruit. Same as retinaculum.
Jardín de hormigas	Una bola de raíces habitada por hormigas que se forma en ciertas especies de plantas epífitas.
Jugum (plural = juga)	A pair of leaflets on a pinnately compound leaf.
Keel	Ridged like the bottom of a boat; same as carinate.The two lower, united petals of the flower of most species of Fabaceae subfamily Papilionoideae.
Keeled	Bearing a keel, same as carinate.

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