Ethnobotany, Phenology and Conservation of Four Species of The Genus Sansevieria Thunb: Case of Nakuru and Maragua Districts, Kenya
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Date
2005
Authors
Khalumba, Mercelyne Luxen
Journal Title
Journal ISSN
Volume Title
Publisher
Kenyatta University
Abstract
Many people especially in developing countries rely on wild collected plants for
construction, fuel wood, medicine and many other purposes. Today there is often a
decrease in the availability of wild plants resources due to increased human and animal
populations and the effect of competition with other forms of land use. The destruction of
the ecosystem and loss of genetic wealth are depriving man of the natural condition of
life. The erosion of biodiversity is an irreversible process, and this has resulted in
worldwide call for the conservation of biodiversity. Approximately 75 species constitute
Sansevieria Thunb, a tropical terrestrial genus of Ruscaceae. About 41 of these species
are found in East Africa, 21 in Kenya while 9 are endemic in Kenya. Information on
ethnobotany, phenology and conservation status of these species in Kenya is limited and
in order to conserve wild plants they must carefully documented. It is in this light that the
study of ethnobotany, phenology and conservation of the four Sansevieria species was
considered important for investigation. The study was designed to find out: the use-value,
the phenological pattern, indicator species and threats to conservation status of
Sansevieria sufJruticosa. N.E Br., Sansevieria parva. N.E Br Sansevieria rafjillii N.E Br
and Sansevieria ehrenbergii Schweinf.ex Bak growing naturally in Nakuru and Maragua
districts. Data was collected by means of a questionnaire and observation schedules using
random sampling technique. Data gathered was analyzed using descriptive and inferential
statistics. From field survey S .parva is highly valued for fodder for both domestic and
wild animals; S. sufJruticosa and S. ehrenbergii are valued for fibres and soil
conservation. The results indicate that leaves of S. sufJruticosa and S. ehrenbergii are
valued for treatment of ear-ache and open fresh wounds while their rhizomes are used to
treat snakebite and stomach ulcers. The Common method of extraction is squeezing the
extracts to the affected area. The rhizome of S. rafjillii was reported to be poisonous. The
results indicate that the three Sansevieria fibres can be used in briquette production and
weaving (51 %). The study found out that the commonest plant species associated with
Sansevierias are: Opuntia vulgaris (88%), Aloe nyeriensis (83%), Euphorbia
candelabrum (78%), Cissus quadrangularis (68%) and Aloe graminacollii (67%) and
they belong to the following families, Cactaceae, Aloaceae, Euphorbiaceae, and
Vitaceae. Field observation indicated that there was poor no regeneration from seeds.
Field observation indicated that there was low regeneration level at a rate of S.
ehrenbergii (5%) and S. raffillii (13%) young shoots per quadrat from the rhizome and
none from seeds during the study period. The leaf size structure revealed that there were
many mature plants S. ehrenbergii (90%), S. rafjillii (86%) compared to juvenile ones
(10% and 14% respectively) in the quadrats studied. The results also indicated that man is
the main threat of Sansevieria species in the field, destroying over (80%), due to
settlement, clearance for agricultural land and felling of firewood tree species. The
information from this study could be useful in designing intervention conservation
programmes and sustainable utilization of Sansevieria species. More research is needed to
determine chemical compounds which lead to treatment of diseases such as ear-ache,
snake bite remedy, skin infection and treatment of fresh wounds. Effective conservation
would be achieved by having more research on Sansevieria products .The focus should
be, on production of certain fibre products, better technologies for sustainable briquette
production.
Description
A Thesis Submitted in Partial Fulfilment of the Requirement for the Award of Degree of Master of Environmental Studies (Agroforestry and Rural Development) In the School of Environmental and Human Sciences of Kenyatta University, 2005