INCLUDED, applied to the stamens when inclosed within the corolla, and not pushed out beyond its tube. INCUMBENT, cotyledons with the radicle on their back. INCURVED, bending inward. INDEFINITE, applied to inflorescence with centripetal expansion; also to stamens above twenty, and to ovules and seeds when very numerous. INDEHISCENT, not opening, having no regular line of suture. INDIGENOUS, an aboriginal native in a country. INDUPLICATE, edges of the sepals or petals turned slightly inward in æstivation. INDUSIUM, epidermal covering of the fructification in some ferns. INFERIOR, applied to the ovary where it seems to be situated below the calyx, and to the part of the flower furthest from the axis. INFLEXED, bending inward. INFLORESCENCE, the mode in which the flowers are arranged on the axis. INFUNDIBULIFORM, in shape like a funnel, as seen in some gamopetalous corollas. INNATE, applied to anthers when attached to the top of the filament. INSPISSATED, thickened or dried-up juice or sap. INTERNODE, the portion of the stem between two nodes or leaf-buds. INTERPETIOLAR, between the petioles. INTERRUPTEDLY-PINNATE, a pinnate leaf in which pairs of small pinnæ occur between the larger pairs. INTINE, the inner covering of the pollen grains. INTRAMARGINAL, within the margin. INTRORSE, applied to anthers which open on the side next the pistil. INVERSE, inverted. INVOLUCEL, bracts surrounding the partial umbel of _Umbelliferæ_. INVOLUCRE, bracts surrounding the general umbel in _Umbelliferæ_, the heads of flowers in _Compositæ_, and in general any verticillate bracts surrounding numerous flowers. INVOLUTE, edges of leaves rolled inward spirally on each side in æstivation. IRREGULAR, a flower in which the parts of any of the verticils differ in size. ISOMEROUS, when the whorls of a flower are composed each of an equal number of parts. ISOSTEMONOUS, when stamens and floral envelopes have the same number of parts or multiples. ISOTHERMAL, lines passing through places which have the same mean annual temperature. J JUGATE, applied to the pairs of leaflets in compound leaves; _Unijugate_, having one pair; _Bijugate_, two pairs, and so on. K KEEL, same as Carina. KNOTTED, when a cylindrical stem is swollen at intervals into a knob. L LABELLUM, lip. one of the divisions of the inner whorl of the flower in orchids. This part is in reality superior, but becomes inferior by the twisting of the ovary. LABIATE, lipped; applied to irregular gamopetalous flowers, with an upper and under portion separated more or less by a hiatus or gap. LACINIATE, irregularly cut into narrow segments. LACTESCENT, yielding milky juice. LACUNA, a large space in the midst of a group of cells. LAMELLÆ, gills of an Agaric; also applied to flat divisions of the stigma.