_Imbricate_, _Imbricated_, _Imbricative_, overlapping one another, like tiles or shingles on a roof, as the bud-scales of Horse-chestnut and Hickory, 27. In æstivation, where some leaves of the calyx or corolla are overlapped on both sides by others, 98. _Immarginate_, destitute of a rim or border. _Immersed_, growing wholly under water. _Impari-pinnate_, pinnate with a single leaflet at the apex, 57. _Imperfect flowers_, wanting either stamens or pistils, 85. _Inæquilateral_, unequal-sided, as the leaf of a Begonia. _Inane_, empty, said of an anther which produces no pollen, &c. _Inappendiculate_, not appendaged. _Incanous_, _Incanescent_, hoary with soft white pubescence. _Incarnate_, flesh-colored. _Incised_, cut rather deeply and irregularly, 58. _Included_, enclosed; when the part in question does not project beyond another. _Incomplete Flower_, wanting calyx or corolla, 86. _Incrassated_, thickened. _Incubous_, with tip of one leaf lying flat over the base of the next above. _Incumbent_, leaning or resting upon; the cotyledons are incumbent when the back of one of them lies against the radicle, 128; the anthers are incumbent when turned or looking inwards. _Incurved_, gradually curving inwards. _Indefinite_, not uniform in number, or too numerous to mention (over 12). _Indefinite_ or _Indeterminate Inflorescence_, 72. _Indehiscent_, not splitting open; i. e. not dehiscent, 119. _Indigenous_, native to the country. _Individuals_, 175. _Indumentum_, any hairy coating or pubescence. _Induplicate_, with the edges turned inwards, 97. _Induviate_, clothed with old and withered parts or _induviæ_. _Indusium_, the shield or covering of a fruit-dot of a Fern, 159. _Inermis_, Latin for unarmed, not prickly. _Inferior_, growing below some other organ, 96. _Infertile_, not producing seed, or pollen, as the case may be. _Inflated_, turgid and bladdery. _Inflexed_, bent inwards. _Inflorescence_, the arrangement of flowers on the stem, 72. _Infra-axillary_, situated beneath the axil. _Infundibuliform_ or _Infundibular_, funnel-shaped, 90. _Innate_ (anther), attached by its base to the very apex of the filament, 101. _Innovation_, a young shoot, or new growth. _Insertion_, the place or the mode of attachment of an organ to its support, 95, 99. _Integer_, entire, not lobed. _Integerrimus_, quite entire, not serrate. _Intercellular Passages_ or _Spaces_, 131, 143. _Interfoliaceous_, between the leaves of a pair or whorl. _Internode_, the part of a stem between two nodes, 13. _Interpetiolar_, between petioles. _Interruptedly pinnate_, pinnate with small leaflets intermixed with larger. _Intine_, inner coat of a pollen grain. _Intrafoliaceous_ (stipules, &c.), placed between the leaf or petiole and the stem. _Introrse_, turned or facing inwards; i. e. towards the axis of the flower, 101. _Intruse_, as it were pushed inwards.