A Systematic Study on Vitex Tourn. (Verbenaceae) in Sabah And Sarawak, Malaysia
This thesis comprised a systematic study of the genus Vitex Tourn. (Verbenaceae) in Sabah and Sarawak, Borneo. The study was mainly based on 1,064 herbarium specimens obtained from seven herbaria. Additional information on the species was also gathered from some field observations of natural popu...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10013/1/FH_2000_4_IR.pdf |
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| Summary: | This thesis comprised a systematic study of the genus Vitex Tourn. (Verbenaceae)
in Sabah and Sarawak, Borneo. The study was mainly based on 1,064 herbarium
specimens obtained from seven herbaria. Additional information on the species
was also gathered from some field observations of natural populations, with the
incorporation of new characters such as inflorescence architecture and its degree
of hairiness, epidermal structures of leaves through the scanning electron
microscopy. The genus Vitex comprises 12 species i.e. V. trifolia, V. ovata, V.
neg undo, V. cannabifolia, V. pinnata, V. quinata, V. parviflora, V. gamosepa/a, V.
vestita, V. secundiflora, V, longipes and V. f1ava; the latter three species are
endemic to Borneo. Taxonomic evidences were obtained based on the
morphology, anatomy, palynology, ecology and distribution of the taxa, which were
finally subjected to numerical methods. The vegetative morphological characters
found to be diagnostic where growth form, habit and buttress formation; leaf
characteristics such as arrangement, shape, apex, base, margin, number of
secondary nerves, petiole and petiolule length, texture, the adaxial and abaxial
surface, size length and width; reproductive characters includes inflorescence
characteristics such as position, architecture, length and width; flower characteristics such as perianth and colour of petals, and of calyx, fruiting calyx;
and, fruit features such as size and seeds. |
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