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Figure 2. Micrographic features of <i>A. Cordifolia</i>: stomata (A), crystal fiber fragments (B), elongated palisade cells (C) and epidermal cell fragments (D).

Figure 3. Microscopic features of <i>A. boonei</i>: hexagonal isodiametric epidermal cells (A), spiral vessel fragments (B), unicellular non-glandular trichomes with a finely granular surface (C), and elongated fiber fragments (D).

Figure 4. Microscopic features of <i>Ficus vallis-choudae</i>: smooth unicellular trichomes (A), punctate vessel fragments (B), parenchyma fragments (C), and palisade cell fragments (D).

Figure 5. Microscopic properties of <i>Musanga cercopioides</i>: crystalline fibers (A), fragments of hexagonal epi-dermal cells (B), numerous unicellular branched or arborescent trichomes(C) and fragments of spiral vessels (D).

Figure 6. Microscopic profile of <i>Macaranga spinose</i>: oxalate calcium crystals (A), long smooth unicellular trichomes (B), spiral vessels (C) and fragments of palisade cells (D) and also polygonal epidermal cells.

Figure 7. Microscopic profile of <i>Pycnathus angolensis</i>: punctate vessel fragments (A), suber fragments (B), epidermal cells (C) and fiber fragments (D) and several distinct stomata.

Figure 8. Microscopic features of <i>Cola acuminata</i>: diacytic stomata (A) and fragments of spiral vessels (B).

Figure 9. Microscopic characteristics of <i>Trilepisium madagariensis</i>: paracytic stomata (A), lower epidermal cells (B), upper epidermal cells (C) and fiber fragments (D).

Figure 10. TLC chromatogram of the methanolic extracts of the plants at 366 nm [System: Ethyl acetate/formic acid/acetic acid/water (100: 11:11: 27), Detection: Neu reagent].

Figure 11. TLC chromatogram of the methanol extracts of the plants studied in the visible [System: Ethyl ac-etate/Methanol/Water (100: 13.5: 10), Detection: sulfuric alcohol].

Figure 12. TLC chromatogram of ethyl acetate extracts of the plants studied in the visible [System: Tolu-ene/Ethyl acetate (9: 1 v/v), Detection: Sulfuric anisaldehyde]

Figure 13. TLC chromatogram of the methanolic extracts of the plants studied in the visible [System (Ethyl acetate/formic acid/water (100: 10: 40 v/v), Detection: phosphoric vanillin]

Figure 14. TLC chromatogram of methanolic extracts of the studied plants at 366 nm [System (Ethyl ace-tate/Methanol/Water (100: 13.3: 10 v/v), Detection: alcoholic KOH]

Figure 15. TLC chromatogram of the methanol extracts of the studied plants [System (Toluene/Ether (1: 1 v/v), Detection: alcoholic KOH]