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Leaf architectural studies in the asteraceae 1






Pakistan Journal of Botany 14(2): 143-154

Leaf architectural studies in the asteraceae 1

Leaf architectural studies were made in 22 genera and 25 spp. belonging to 8 tribes of the Asteraceae. Leaves are oblong, ovate or elliptic; the base acute, obtuse or lobate; the apex acute, acuminate, attenuate or labate and the margin is lobed, wavy or serrate. The average size of the fully mature foliage leaves vary from species to species. The major venation pattern conforms to pinnate-craspedodromous, pinnate-camptodromous with festooned brochidodromous secondaries, acrodromous and palinactinodromous types. Marginal ultimate venation is either incomplete, looped or fimbriate. The number of primary veins vary according to the type of venation pattern. The number of secondaries on 1 side of the primary vary from species to species and even within the same species. The highest vein order occurs up to 5.degree. Areoles are formed by tertiary and higher order veins. A bundle sheath is present in some species. Loop formation, isolated free vein endings and isolated tracheids are present. Tracheids are uni, bi-or multi-seriate. Secretory cavities are present at the margins of Tagetes patula. Qualitative feature and numerical data on leaf architecture were compiled.


Accession: 005798881



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