GLOSSARY — : 793 
Inpu’stuM.—An outgrowth of the lower epidermis of many ferns that covers the 
cluster of sporangia. 
INEQUILAT’ERAL.—Having unequal sides. 
InFrer’10R.—Applied to an ovary when the other floral parts are inserted above it. 
INFLORESs’CENCE.—The arrangement of the flowers on the stem of a plant. 
INFUNDIB’ULIFORM.—Funnel shaped. 
InNATE’.—Applied to anthers that are attached by their base to the summit of the 
filament. 
INTEG’UMENT.—A covering. 
INTERCEL’LULAR.—Between the cells. 
INTERFASCIC’ULAR Cam’pruM.—Applied to a cambium layer which extends from 
one fibrovascular bundle to another in the stems of Dicotyledons and 
Gymnosperms. 
INTER’NAL GLANDs.—More or less globular or elliptical shaped secretion reservoirs. 
INTER’NAL PHLoem (Intraxylary Phloem).—A strand of phloem on the inner face 
of the xylem, as found in bicollateral bundles. 
In’TERNODE.—That portion of the stem between two nodes. 
INTERRUP’TEDLY-PIN’NATE.—Applied to a pinnate leaf that has either smaller or 
larger leaflets between those of usual size. 
In’TINE.—The inner coat of the pollen grain. 
In’tRA.—A prefix meaning within. 
INTRAPET’IOLAR.—Applied to stipules that are between the petiole and the stem; 
also to buds that are beneath or inside of the base of the petiole. 
IntRorsE’.—Applied to anthers that face toward the gynoecium. 
InTUssusceP’TION.—The formation of additional particles of protoplasm between 
those already present. 
In’uLin.—A carbohydrate isomeric with starch found in the cell sap of the Compos- 
ite, Lobeliacez and some other families, from which it crystallizes in 
lumps (in air-dried material) or in sphaerocrystals (in alcohol-preserved 
material). 
In’voLucreE.—A whorl (or whorls) of bracts subtending a flower or flower cluster. 
Invot’uceL.—A secondary involucre. 
In’voLute.—Applied to the arrangement of leaves within a bud when they are 
rolled inward from both sides. : 
IrrirAsit.1ry.—That property of living matter whereby it responds to a stimulus. 
Iso’prAMET’RIC.—Applied to cell having nearly the same length, breadth and thick- 
ness. 
Isoc’amy.—The union of sexual cells of similar form. 
Isom’EROUs.—Having the same number of parts in each whorl. 
IsostEM’oNous.—Having the stamens and petals each in one whorl and of the same 
number. 
IsrH’mus.—Applied to the constricted portion between the two half cells i in certain 
desmids. 
KARYOKINE’sIs.—Indirect nuclear division. 
KaTAs’ouisM.—Destructive metabolism. 
ac sAgiellid to a longitudinal ridge or elevation of cortical tissue of Senega 
root which extends from the crown downward. Also applied to the two 
inferior petals of a papilionaceous corolla which are more or less united into 
a body resembling the keel of a boat. 
