LEAF TYPE 7
-
Upload
jeemcarlofagelapula -
Category
Documents
-
view
224 -
download
6
description
Transcript of LEAF TYPE 7
-
LEAF TYPE
-
LEAF TYPEthe pattern of division of a leaf into discrete components or segmentsCan be either:1. Simple2. Compound
-
Simpleone bearing a single, continuous blade
-
Compound leafone divided into two or more, discrete leafletsare defined based on the number and arrangement of leaflets
-
LEAF DIVISIONSA simple leaf maybe highly divided, but as long as the divisions are not discrete leaflets, it is still technically a simple leaf
-
Leaf TypesPinnately compound / Pinnate leafBipinnately compound / Bipinnate leafTripinnately Compound / Tripinnate leafPalmately Compound / Palmate leafCostapalmate leafTrifoliate /Ternately compound leafBiternately compound leafGeminate leafUnifoliate
-
Pinnately Compound / Pinnate Leafone with leaflets arranged (either oppositely or alternately) along a central axis, the rachis
-
Pinnately Compound / Pinnate LeafIMPARIPINNATE- if a pinnate leaf has a terminal blade and typically an odd number of leafletsPARIPINNATE- if it lacks a terminal leaflet and has an even number of leaflets
-
Bipinnately Compound / Bipinnate Leafis with two orders of axes, each of which is pinnate (equivalent to a compound leaf of compound leavesthe central axis of a bipinnate leaf is still termed the rachisthe lateral axes that bears leaflets are termed rachillae (singular rachilla)
-
Tripinnately Compound / Tripinnate LeafCompound leaf with three orders of axes, each pinnate
-
Palmately Compound / Palmate Leafa compound leaf in which four or more leaflets arise from a common point, typically at the end of the petiole
-
Costapalmate Leafone that is essentially palmately compound to divided, but has elongate, rachislike extension of the petiole ( the costa) as occurs in some palms
-
Trifoliate / Ternately Compound Leafwith only three leafletsmost are palmate-ternate, in which the three leaflets join at a common pointrarely, ternately compound leaves can be pinnate-ternate, in which the terminal leafleat arises from the tip of the rachis
-
Biternately Compound Leafa leaf with two orders of axes, each ternately compound
-
Geminate LeafConsisting of only two leaflets
-
Bigeminate Leafa compound leaf with two rachillae, each bearing two leaflets
-
Geminate-Pinnate Leafa compound leaf with two rachillae, each of these bearing a pinnate arrangement of leaflets
-
Unifoliate Leafa very specialized type of leaf that appears superficially to be simple, but actually consists of a single leaflet attached to the apex of a petiole, the junction between them clearly definedis interpreted as being derived by reduction of an ancestrally compound leaf
-
Heteroblasty / Heteroblastic Leafin which the juvenile leaves are distinctly different in size or shape from the adult leaves