Category: I
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Isobilateral
With structurally similar upper and lower surfaces.
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Iso
Isotype.
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Isandrous
With the number of stamens equal to the number of petals or sepals [unusual term]; With stamens of equal length.
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Irregular flowers
Those of which the parts of the calyx or corolla are dissimilar in size or shape (i.e. asymmetrical or zygomorphic flowers). This name is given when members of the same sort as, for instance, the petals are unlike in shape or size. One which is not radially symmetrical, with all peta ls equal, but only…
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Iridiform
(Of leaves) resembling an Iris, with a flat leaf whose two folded halves have fused so that the vascular bundles point both ways.
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Iridescent
Many-coloured, with rainbow sheen. With an oily or metallic gloss, referring to the rainbow colouring it may produce.
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Iridaceous
Shaped like an Iris leaf, i.e. long, narrow and acute.
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Involute
(Of leaf margins) rolled inwards and upwards towards their upper/adaxial surface. Mushroom cap with inrolled margin. Grown inwards from the edges.
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Involucre
A series of bracts (the phyllaries), usually close together and appressed, below or around a compact head of flowers (as in Compositae/Asteraceae). A whorl of bracts below an inflorescence (such as found on a sunflower). One or more whorls of minute leaves. A set of separate or fused bracts associated with a fruit, as in…
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Involucrate
With an involucre (a cluster of bracts).