Teepically a leaf is a thin, flattened organ borne abuin the grund an specialized forphotosynthesis, but mony types o leafs is adaptit in weys naur unrecognisable in thae terms: some arenae flat (for insaumple, monysucculent leafs anconifers), some arenae abuin the grund (likebulb scales), an some dinna hae major photosynthetic function (consider for insaumplecataphylls,spines, ancotyledons).
Conversely, mony structurs o non-vascular plants, or even o somelichens, that isnaeplants at aw (in the sense o bein members o the kinrickPlantae), dae leuk an function a fair bit lik leafs. Furthermair, several structurs foond in vascular plants leuk lik leafs but arenae actually leafs; thay differ frae leafs in thair structurs an origins. Insaumples includephyllodes,cladodes, anphylloclades.[3]
