hypogeal. Said of seeds (as garden pea) in which the cotyledons remain under ground in germination. See [epigeal].
imperfect flowers lack either stamens or pistils.
incomplete flowers lack one of the parts or series, as the calyx, corolla, stamens, or pistil.
indeterminate. See [centripetal].
indusium. The scale or lid covering a sorus, in ferns and allied plants.
inflorescence. Properly, the mode of flowering (page 160), but sometimes used in the sense of a flower-cluster.
involucre. A set or whorl of leaves or bracts beneath a flower or a cluster of flowers; sometimes looks like an outer or extra calyx.
irregular flowers have some members of one or more of the series unlike their fellows.
key fruit. See [samara].
labiate. Lipped; that is, divided into parts, as the lips of a mouth. Said usually of corollas that are lobed into two parts.