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The foliar trichomes of Hypoestes aristata (Vahl) Sol. ex Roem. & Schult var aristata (Acanthaceae) a widespread medicinal plant species in tropical sub-Saharan Africa: with comments on its possible phylogenetic significance

DOI: 10.4067/S0716-97602010000400004

Keywords: acanthaceae, glandular trichomes, hypoestes aristata var. aristata, medicinal plant, scanning electron microscope.

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the micromorphology of foliar trichomes of hypoestes aristata var. aristata was studied using stereo, light and scanning microscopy (sem). this genus belongs to the advanced angiosperm family acanthaceae, for which few micromorphological leaf studies exist. results revealed both glandular and non-glandular trichomes, the latter being more abundant on leaf veins, particularly on the abaxial surface of very young leaves. with leaf maturity, the density of non-glandular trichomes decreased. glandular trichomes were rare and of two types: long-stalked capitate and globose-like peltate trichomes. capitate trichomes were observed only on the abaxial leaf surface, while peltate trichomes were distributed on both adaxial and abaxial leaf surfaces.


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