I

imbricate: of perianth parts, having the edges overlapping in the bud. cf. valvate.

imparipinnate: having an uneven number of pinnae, by virtue of having one terminal pinna. cf. paripinnate.

incised: cut deeply, sharply and often irregularly (an intermediate condition between toothed and lobed).

included: enclosed, not protruding.

incrassate: thickened; of a pollen grain, with thickened margins around the apertures.

incumbent: of the orientation of an embryo, with the cotyledons lying face to face and folded downwards beside the radicle; of anthers, lying against the inner face of the filament.

incurved: bent or curved inwards or upwards; of leaf margins, curved towards the adaxial surface.

indefinite: variable in number; numerous; of stamens, more than twice as many as the petals or sepals; of an inflorescence, not terminating in a flower (i.e. having a continuing, terminal growing point).

indehiscent: not opening at maturity.

indeterminate: of an inflorescence, when the floral axis is not terminated by a flower, ie a racemose inflorescence. cf. monopodial.

indumentum: the epidermal appendages, e.g. hairs or scales, collectively.

induplicate: folded inwards so that the outer faces of the margins are in contact.

indurated: hardened.

indusium: tissue covering the sorus of a fern; a hollow pollen-cup surrounding the stigma in Goodeniaceae.

inferior: of an ovary, at least partly below the level of attachment of the other floral parts. cf. superior.

inflexed: bent sharply upwards or forwards. cf. deflexed.

inflorescence: the group or arrangement in which flowers are borne on a plant.

infraspecific: of lower taxonomic rank than species.

infructescence: the grouping or arrangement in which fruits are borne on a plant.

insectivorous: catching, and ostensibly feeding on, insects.

inserted (on): attached to; arising from.

integument: a covering; one of the outer layers of tissue of an ovule.

intercalary: between two points.

intercalary growth: extension or growth from an intercalary meristem, i.e. neither from the apex nor the base.

intercalary inflorescence: an inflorescence that either arises in an internodal position, or one originally terminal but ceasing to be so when vegetative growth subsequently resumes from the stem apex.

internode: the portion of a stem between the level of insertion of two successive leaves or leaf pairs (or branches of an inflorescence).

interpetiolar: of stipules, between the petioles of two opposite leaves. cf. intrapetiolar.

interrupted: of an inflorescence, having the flowers unevenly distributed along the axis, with conspicuous gaps.

interstaminal corona: in Asclepiadaceae, fleshy lobes, often connate into a tube, attached to the base of the staminal column in the interstaminal areas. see gynostegial corona.

intramarginal: situated inside but close to the margin, e.g. of a vein in a leaf.

intrapetiolar: between a petiole and the subtending stem. cf. interpetiolar.

introduced: not indigenous; not native to the area in which it now occurs. cf. adventive, naturalised.

introrse: of anthers, dehiscing towards the centre of the flower. cf. extrorse.

involucre: a group of bracts enveloping a condensed inflorescence; a layer of tissue enveloping particular structures, e.g. an archegonium in Bryophyta, sporangia in Hymenophyllaceae.

involucel: involucre of bractlets surrounding a secondary inflorescence such as the base of an umbellule.

involute: rolled inwards; of a leaf, with the margins rolled towards the adaxial surface. cf. revolute.

irregular: see zygomorphic.

isobilateral (= isolateral): having structurally similar upper and lower surfaces. cf. dorsiventral.

isotype: a specimen which is a duplicate of the holotype, i.e. part of the same collection. cf. type.

Back to Glossary Index

J-K

juvenile: of leaves, formed on a young plant and different in form from the adult leaves.

karyoevolution: evolutionary change in the chromosome set, expressed as changes in number and gross structure of the chromosomes; (more broadly), evolutionary relationships between taxa as indicated by karyotype differences.

karyotype: the gross morphology of the chromosome set, described in terms of number, length, centromere position, etc.

keel: a ridge like the keel of a boat; in Fabaceae, a boat-shaped structure formed by fusion of the two anterior petals of a flower.

keeled: of leaves, petals or bracts, folded and ridged along the midrib.

Kingdom (= regnum): the most inclusive taxonomic rank recognised by the International Code of Botanical Nomenclature (some authors have used the informal rank of Domain above that of Kingdom).

kwongan: low sand heath or sand plain sclerophyllous vegetation common in south-western W.A.

Back to Glossary Index


Copyright

This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Australian Biological Resources Study. Requests and inquiries concerning reproduction and rights should be addressed in the first instance to the Executive Editor - Flora. These pages may not be displayed on, or downloaded to, any other server without the express permission of ABRS.


.

Last updated on 13 May 1999.

Australian Biological Resources Study