_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, 122. _Kidney-shaped_, resembling the outline of a kidney, 53. _Labellum_, the odd petal in the Orchis Family. _Labiate_, same as _bilabiate_ or two-lipped, 92. _Labiatiflorous_, having flowers with bilabiate corolla. _Labium_ (plural, _Labia_), Latin for lip. _Lacerate_, with margin appearing as if torn. _Laciniate_, slashed; cut into deep narrow lobes or _Laciniæ_. _Lactescent_, producing milky juice, as does the Milkweed, &c. _Lacteus_, Latin for milk-white. _Lacunose_, full of holes or gaps. _Lacustrine_, belonging to lakes. _Lævigate_, smooth as if polished. Latin, _Lævis_, smooth, as opposed to rough. _Lageniform_, gourd-shaped. _Lagopous_, Latin, hare-footed; densely clothed with long soft hairs. _Lamellar_ or _Lamellate_, consisting of flat plates, _Lamellæ_. _Lamina_, a plate or blade, the blade of a leaf, &c., 49. _Lanate_, _Lanose_, woolly; clothed with long and soft entangled hairs. _Lanceolate_, lance-shaped, 52. _Lanuginous_, cottony or woolly. _Latent buds_, concealed or undeveloped buds, 30. _Lateral_, belonging to the side. _Latex_, the milky juice, &c., of plants, 135. _Lax_ (_Laxus_), loose in texture, or sparse; the opposite of crowded. _Leaf_, 49. _Leaf-buds_, 31. _Leaflet_, one of the divisions or blades of a compound leaf, 57. _Leaf-like_, same as _foliaceous_. _Leathery_, of about the consistence of leather; coriaceous. _Legume_, a simple pod which dehisces in two pieces, like that of the Pea, 122. _Leguminous_, belonging to legumes, or to the Leguminous Family. _Lenticular_, lens-shaped; i. e. flattish and convex on both sides. _Lappaceous_, bur-like. _Lasio_, Greek for woolly or hairy, as _Lasianthus_, woolly-flowered. _Lateritious_, brick-colored. _Laticiferous_, containing latex, 135. _Latus_, Latin for broad, as _Latifolius_, broad-leaved.