GLOSSARY OF BOTANICAL TERMS. 



415 



Hypodermal. — Beneath the epidermis j 

 belonging to the hypoderma. 



Hypog.-eal, or HypoGjEOUS. — Growing un- 

 derground. 



Hypogynous. — Underneath the pistils. Ap- 

 plied to stamens or other floral organs that 

 are free from the pistil and inserted on the 

 receptacle beneath it. 



Hyponasty. — Curvature produced by- 

 growth on the under side of an extended 

 organ. 



Hypsophyll. — A bract. 



TDIOBLAST.— A single cell which inform, 

 size or contents differs considerably from 

 the surrounding cells of a tissue. 



Imbricate. — Applied to that arrangement 

 of leaves or floral organs in the bud, in 

 which they overlap like shingles on a roof. 



Immersed. — Applied to leaves or other 

 organs when they grow wholly under 

 water. 



Impari-pinnate. — Pinnate, with an odd 

 leaflet at the apex. 



Inequilateral. — Unequal-sided, as the 

 bases of some leaves. 



Incised. — Gashed, or sharply and rather 

 deeply cut. Applied to leaf margins, etc. 



Included. — Applied to stamens or pistils 

 that do not project beyond the corolla, 

 but are contained within it. 



Inclmbent. — Applied to cotyledons when 

 the radicle is folded back so as to be in 

 contact with the outer face of one of them. 



Indefinite. — Not limited. Applied to 

 petals and other organs when too numer- 

 ous to be conveniently counted. Also 

 applied to inflorescence in the same sense 

 as indeterminate, q. v. 



Indehiscent. — Not splitting open. Applied 

 to certain fruits, etc. 



Indeterminate. — Applied to that type of 

 inflorescence in which the flowers are the 

 products of axiliary buds and the inflor- 

 escence is centripetal. 



Indigenous. — Native to the country. 



Induplicate. — Applied to that form of 

 valvate aestivation in which the margins of 

 the leaves are indexed or folded inward. 



Indusium. — A membrane which in many 

 cases covers the fruit-dots or sori of 

 Ferns. 



Inferior. — Applied to an ovary which has 

 an adherent calyx. 



Inflorescence. — The arrangement of 

 flowers in clusters. (See Anthotaxy). 



Infra-axillary. — Below the axil. 



Infundibuliform. — Funnel-shaped. 



Innate. — Applied to anthers which are 

 attached by their base to the apex of the 

 filament. 



Inosculating. — The same as Anastomos 

 ing. 



Insertion. — The place or manner of attach- 

 ment of a part or organ on the organ which 

 bears it. 



Inter-fascicular. — Between the bundles. 

 Inter-fascicular cambium is that portion 

 of the cambium zone which lies between 

 the fibro-vascular bundles in the stems of 

 Gymnosperms and Dicotyledons. 



Internal Cell Formation. — That mode 

 of cell division in which new cells are 

 formed within the walls of an old cell. 



Internode. — That portion of a stem which 

 lies between the points of insertion of two 

 successive leaves or of two successive 

 whorls of leaves. 



Interruptedly-pinnate. — App ied to a 

 pinnate leaf that has small leaflets inter- 

 mixed with larger ones. 



Interstitial. — Situated between. Applied 

 to that form of growth which consists in 

 the interposition of new particles between 

 old ones instead of in additions to the 

 surface. 



Intine. — The inner coat of the pollen-grain. 



Introse. — Applied to stamens that face in- 

 ward or toward the pistil. 



Inulin. — A principle isomeric with starch, 

 which replaces that substance in many 

 Compositae and some other plants. 



Involucre. — The name applied to the whorl 

 or whorls of bracts at the base of a flower 

 cluster. 



Involucel. — A secondary involucre, as the 

 whorl of bractlets that subtend the umbel- 

 lets of many of the L'mbelliferae. 



Involute. — A form of vernation in which 

 the leaves are rolled inward from their 

 edges. 



Irritability. — The property of responding 

 to stimulus. 



Isogamous.— A term used to designate that 

 mode of reproduction in which the uniting 

 gametes are of equal size. The same as 

 conjugating. 



Isomerous. — Having an equal number of 

 parts in the successive whorls. 



Isostemenous. — Having the stamens of the 

 same number as the petals. 



