arts or _induviae_.

_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.

_Inversed_ or _Inverted_, where the apex is in the direction opposite to
that of the organ it is compared with.

_Involucel_, a partial or small involucre, 76.

_Involucellate_, furnished with an involucel. _Involucrate_, furnished
with an involucre.

_Involucre_, a whorl or set of bracts around a flower, umbel, or head,
&c., 74, 75.

_Involute_, in vernation, 72; rolled inwards from the edges, 97.

_Irregular Flowers_, 86, 91.

_Isos_, Greek for equal in number. _Isomerous_, the same number in the
successive circles or sets. _Isostemonous_, the stamens equal in number
to the sepals or petals.

_Jointed_, separate or separable at one or more places into pieces, 64,
&c.

_Jugum_ (plural _Juga_), Latin for a pair, as of leaflets,--thus
_Unijugate_, of a single pair; _Bijugate_, of two pairs, &c.

_Julaceus_, like a catkin or _Julus_.

_Keel_, a projecting ridge on a surface, like the keel of a boat; the
two anterior petals of a papilionaceous corolla, 92.

_Keeled_, furnished with a keel or sharp longitudinal ridge.

_Kermesine_, Carmine-red.

_Kernel_ of the ovule and seed, 110.

_Key_, or _Key-fruit_, a Samara