ACACIA POLYACANTHA PDF

Attachments 5. Requesting you to help in identifying the attached tree. It was planted. The tree was roughly 20 feet in height and its whitish bark was flaking. My guess is Acacia polyacantha Syn.

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Stipules are not spinescent. Small, actinomorphic, bisexual Flowers in elongated spikes. Description Acacia polyacantha subsp. RSA Tree No. Family: Fabaceae or Leguminosae. Pea, bean or legume family. The Fabaceae are recognisable by their fruit and by their pinnately compound Leaves. Leaves may also be simple and usually have stipules — some of which may be spinescent.

Leaflets are usually entire. Flowers are bisexual and bracteate. Regular flowers usually have sepals and the same number of petals. Irregular flowers have sepals and 5 or less petals. Stamens have anthers that have 2 pollen sacs and there are usually at least twice the number of stamens as petals — often The superior Ovary has one locule that may contain 1 or more ovules.

The Stigma and Style are simple. The single carpel develops into the Fruit, which is usually a pod. This pod dehisces on both sides and may break into segments. Seeds vary. In the genus Vachellia, the inflorescence is capitate head like and spinescent stipules are present.

In the genus Senegalia — stipules are not spinescent and the inflorescence is usually a spike. Name derivation: Acacia — typically thorny. Senegalia — from Senegal. These plants usually do not have spinescent stipules. Conservation Status: L C. Least Concern. Assessment: W. Foden and L. It tends to be flaky or peels off in thick corky flakes and loose strips.

This feature is most noticeable when the tree has lost its leaves photo These paired thorns are wide apart and up to 1,5cm long photo under leaves. Individual, persistent down pointing Thorns may also appear on the trunk photo Photo: D Becking.

Walter Sisulu NBG. Leaves This tree has bipinnate Leaves Compound: twice pinnate. They are up to 24cm long. The Rachis axis bearing flowers or leaflets is hairy and has glands towards the end of the leaf photo The Petiole leaf stalk is up to 4cm long and has a wide base.

It is wider than the petiole. The centre of the gland may be red or brown photo The linear Stipules basal appendage of the petiole are not spinescent and soon shed. Photo: David Becking. Flowers The new leaves and Flowers appear at the same time. Most are bisexual and actinomorphic Regular, symmetrical. Perianth, the calyx and corolla, are divisible into 3 or more identical sectors. Here the Calyx is up to 2,5mm long and the Corolla is up to 3mm long.

A mass of free exserted sticking out Stamens protrudes through the calyx. Each stamen has a white filament and a yellowish anther giving an overall creamy white appearance to the flower.

There is single Pistil the female element of the flower composed of the ovary, style and stigma present and the single, thin white Style eventually elongates from the superior ovary extending beyond the anthers photo It ends in a small, single, concave Stigma, which becomes receptive after the plants own pollen is shed.

This procedure helps to prevent self-pollination. Fruit The dehiscent Fruit is a hairless, straight, flat, light brown to reddish, coriaceous Pod, which is up to 18cm x 2,1cm. The pendulous pods photo 95 taper towards both ends. Each pod contains from 3 to 10 flattish Seeds. Larvae of the scarlet Butterfly Axiocerses tjoane feed on the Leaves.

The tree Roots have compounds that repel animals e. Ethnobotany The Wood is termite resistant and strong. Heartwood is dark brown and not much used. The Bark can be used for tanning leather. The Gum a water-soluble sugary polysaccharide that is exuded to seal wounds and prevent infection by bacteria and fungi and helps prevent trees from freezing can be used as glue and in confectionary. Silk can be harvested from their tough cocoons. See web references for more details.

This fast-growing tree is easily raised from Seed but needs to be protected from frost for the first year or two. It has invasive roots and should be kept away from buildings.

The wood is used in local medicine and is believed to have magical properties. References Burrows, J. Trees and Shrubs Mozambique. Publishing Print Matters Pty Ltd. Noordhoek, Cape Town. Coates Palgrave, M. Struik, Cape Town. Lawrence, G. M, Tenth Printing Ross, J. A conspectus of the African Acacia Species. Botanical Research Institute. Palmer, E. Schmidt, S. Lotter, M.

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