leaf morphology

7/18/2019 Leaf Morphology

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LEAF

MORPHOLOGY



MORPHOLO

GY

Morphology is a branch of biologydealing with the study of the formand structure of organisms and theirspecic structural features.

This includes aspects of the outwardappearance(shape,structure,colour,p

attern), i.e.External morphologyas well as the form and structure ofthe internal parts i.e. Internal

morphology or Anatomy.



WHAT IS A

LEAF Leaf is an organ of vascularplant and is the principal

lateral appendage of thestem. The leaves and stem

together form a shoot.Foliage is a mass noun thatrefers to leaves collectively.



LEAFMORpHOLOGY

A !tr"#t"rally #ompletelea$ #on!i!t! o$ a Petiole%lea$ !tal&'( a

Lamina%lea$ )la*e' an*

Stip"le!%!mall !tr"#t"re!

lo#ate* to either !i*e o$the )a!e o$ the petiole'

The petiole me#hani#allylin&! the lea$ to the plantan* pro+i*e! the ro"te $ortran!$er o$ ,ater an*!"gar! to an* $rom thelea$. The lamina i!typi#ally the lo#ation o$the ma-ority o$photo!ynthe!i!.



M!

"#$%&

T'"$"F

T%

EPIERMIS* The

epi*ermi! i!the o"terlayer o$ #ell!#o+ering thelea$. It i!

#o+ere* ,itha ,axy#"ti#le ,hi#hi!

impermea)le to li/"i*,ater an*,ater +aporan* $orm!

the

%+'%#ML

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1ROSS SE1TIO2 OF ALEAF



MESOPHYLL3 Mo!t o$ the

interior o$ thelea$ )et,een the"pper an* lo,erlayer! o$

epi*ermi! i! aparen#hyma%gro"n* ti!!"e' or#horen#hyma

ti!!"e #alle* theme!ophyll. Thi!a!!imilationti!!"e i! the

primary lo#ationo$

SPO2GYMESOPHYLL1ELLS



- % ' (

The +ein! are the +a!#"larti!!"e o$ the lea$ an* arelo#ate* in the !pongy layer

o$ the me!ophyll. Thepattern o$ the +ein! i!#alle* 6enation. Inangio!perm! the +enationi! typi#ally parallel inmono#otyle*on! an* $orm!an inter#onne#ting net,or&in )roa*7lea+e* plant!.

A +ein i! ma*e "p o$ a

+a!#"lar )"n*le. At the #oreo$ ea#h )"n*le are #l"!ter!o$ t,o *i!tin#t type! o$#on*"#ting #ell!3

8. 9YLEM3 #ell! that )ring,ater an* mineral! $rom



;ASI1LE

AFTY PE

S

Fern! ha+e $ron*! 1oni$er lea+e! are

typi#ally nee*le or

!#ale7!hape* Angio!perm%<o,eringplant' lea+e!3 the!tan*ar* $orm in#l"*e!!tip"le!( a petiole an* alamina.

Ly#ophyte! ha+ingmi#rophyll lea+e!.

Sheath lea+e!% type$o"n* in mo!t gra!!e!an* many other

mono#ot!' Other !pe#iali=e*

lea+e! %!"#h a! tho!e o$2epenthe!( a pit#herplant'



I6IS

IO2SOF

TH

T,o )a!i# $orm! o$ lea+e!#an )e *e!#ri)e*#on!i*ering the ,ay the)la*e%lamina' i! *i+i*e*. Asimple leaf has anundivided blade. Ho,e+er(the lea$ !hape may )e$orme* o$ lo)e!( )"t thegap! )et,een lo)e! *o notrea#h to the main +ein. A compound leaf has afully subdivided blade, ea#h lea<et o$ the )la*e)eing !eparate* along amain or !e#on*ary +ein.

;e#a"!e ea#h lea<et #an



1

HAR

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ERI

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Petiolated leaves have a petiole an* are !ai* to )epetiolate.

Sessile leaves do not 3the )la*e atta#he!

*ire#tly to the !tem.S")petiolate lea+e! arenearly petiolate( orha+ing an extremely!hort petiole an* appear!e!!ile.

In #laping or decurrentleaves(the )la*e partiallyor ,holly !"rro"n*! the!tem( o$ten gi+ing theimpre!!ion that the!hoot gro,! thro"gh the

lea$. In !ome A#a#ia !pe#ie!(

!"#h a! the &oa tree( thepetiole! are expan*e* or)roa*ene* an* $"n#tionli&e lea$ )la*e! >the!e

are #alle* phyllo*e!.

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leaf morphology

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