Euclea crispa

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Blue guarri
Euclea crispa, habitus, b, Uniegeboutuine.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Ericales
Family: Ebenaceae
Genus: Euclea
Species:
E. crispa
Binomial name
Euclea crispa
Synonyms
  • Euclea lanceolataE.Mey. ex A.DC [1]

Euclea crispa, [note 1] commonly known as the blue guarri, [note 2] is an Afrotropical plant species of the family Ebenaceae. The hardy and evergreen plants may form a dense stand of shrubs, [2] or grow to tree size. It is widespread and common in the interior regions of southern Africa, [3] and occurs northward to the tropics. Though some are present near the South African south and east coasts, [4] they generally occur at middle to high altitudes. [5] It is readily recognizable from its much-branched structure and dull bluish foliage colour. Those bearing lanceolate leaves may however resemble the Wild olive, [3] another common species of the interior plateaus.

Contents

Range and habitat

It is native to central South Africa (where one of 35 native ebony species), [6] Lesotho, Eswatini, the Zimbabwean plateau and Eastern Highlands, [3] Angola, Zambia, Malawi [2] and uplands of tropical Africa. [4]

It is found in open or thick bush along stream banks, [7] woodland, kloofs, hillsides, open forest, along forest margins and regularly in sheltered rocky places. [3] [5] It is rare in the lowveld where it is limited to rocky areas, or areas of higher rainfall. [8]

Habit

It is a rounded, dense and bushy shrub or tree, [7] reaching a height of 2 to 6 metres [7] (rarely 8 to 20 metres), [2] [3] [4] with a spreading, often symmetrical crown. It is slow-growing like its congeners, and becomes frost and drought resistant with age. [6] In Zimbabwe it is a shrub of 1 to 2 m tall, [2] forming small, dense colonies, or a small tree. [5]

Description

Bole and bark

The bole is single or multi-stemmed and up to 30 cm in diameter. [3] The wood is dark brown, hard and close-grained. [4] The bark varies from grey [7] to brown or blackish, [3] and is smooth in young trees, but rougher in older trees. [2]

Foliage

The plants carry a dense canopy of simple leaves of a dull grey-green colour and a rigid, leathery lineament. [3] Variation in terms of colour, shape, texture and arrangement is however considerable. [3] Foliage colour varies from a greyish green to distinctly blue, and the leaf shape varies from lanceolate to obovate. [3] New branches and foliage are covered in rust-brown scales (gland granules), [2] [9] while mature leaves may be hairy or glabrous. [8] Leaves may be opposite, sub-opposite or rarely alternate. [2] The slender petiole is 1.5 to 2 mm long, [2] and the leaves measure up to 5 x 1.5 cm. [8] The leaf veins are clear and transparent against light, unlike the opaque venation of Wild olive trees. [3] [7] Leaves may also resemble those of the Natal guarri, a species of generally lower altitudes, but the latter's leaves have a finely hairy stalk. [4]

Flowers

The fragrant flowers are produced in summer, from October to February. [5] They are small, waxy, pendulous, yellow [8] to greenish-white and borne in axillary pseudo-racemes, [3] [8] holding 3 to 10 flowers each. [2] Their bell-shaped corollas are deeply lobed, [2] [9] and the ovaries are densely covered in bristles. [2]

Fruit

The roundish, pea-sized berries (4 to 5 mm in diameter) [8] are considered palatable when ripe. [7] They are single-seeded and borne on female trees only. [9] As they ripen, they turn from green to reddish brown, and eventually to black. [2] [5] [7] They are somewhat or very hairy when green, [2] but more or less glabrous when mature. [8] Saplings can be grown quite easily from fresh, plump seed, that is sown soon after harvesting. [6]

Subspecies

var. crispa

var. ovata

Species interactions and uses

Lichens often grow on older bark. [6] Bees are attracted to the sweet scent of the summer flowers, and larvae of the moths Ectoedemia crispae and Graphiocephala barbitias feed on the leaves. The fruit are eaten by birds and mammals, including antelope, vervet monkeys, [6] mongooses and rats, [4] while the bark and leaves are browsed by Black rhino. [9] A dye extracted from the roots is used for baskets, mats and wool. [9] A medicinal infusion of the root is also used for various ailments, [6] and the fruit or bark are used as a purgative. [3]

Notes

  1. crispa = "curled", referring to the leaf margins that may be rolled under or wavy
  2. The Khwe appelation "Gwarri" is also the origin of the Afrikaans and Xhosa loan words, "Ghwarrie" and "umGwali", respectively.

Related Research Articles

<i>Euclea</i> Genus of flowering plants

Euclea, from the Greek eukleia meaning "glory and fame", denotes a group of flowering plants in the Ebenaceae or ebony family. They were described as a genus by Linnaeus in 1774. The genus includes evergreen trees and shrubs, native to Africa, the Comoro Islands and Arabia. Several species are used for timber, producing a hard, dark heartwood timber similar to ebony.

<i>Protea caffra</i> Species of African sugarbush

Protea caffra, native to South Africa, is a small tree or shrub which occurs in open or wooded grassland, usually on rocky ridges. Its leaves are leathery and hairless. The flower head is solitary or in clusters of 3 or 4 with the involucral bracts a pale red, pink or cream colour. The fruit is a densely hairy nut. The species is highly variable and has several subspecies.

<i>Protea angolensis</i> Species of flowering plant

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<i>Protea gaguedi</i> Species of flowering plant in the family Proteaceae

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<i>Dalbergia obovata</i> Species of legume

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<i>Croton gratissimus</i> Species of shrub

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<i>Combretum kraussii</i> Species of tree

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<i>Erianthemum dregei</i> Species of mistletoe

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<i>Bauhinia galpinii</i> Species of legume

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<i>Erythrina zeyheri</i> Species of legume

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<i>Ficus ingens</i> Species of fig

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<i>Dalbergia armata</i> Species of legume

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<i>Trichocladus ellipticus</i> Species of plant

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<i>Boscia foetida</i> Species of tree

Boscia foetida, commonly known as the stink shepherd's tree and the smelly shepherd's bush, is an evergreen shrub or tree that is native to the warmer and drier parts southern Africa. It is found in semi-desert and arid bushveld, and in the west it occurs commonly in areas which are otherwise sparsely wooded. It is known for the particularly unpleasant smell of its flowers which appear during early spring, to which its specific name foetida alludes. Its freshly cut wood likewise has an unpleasant smell, and has traditional medicinal and magical uses, for instance as a protection against lightning. In central Botswana the village of Mopipi is named after this species.

References

  1. "Euclea crispa (Thunb.) Gürke". The Plant List 2010. Retrieved 15 November 2013.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Palgrave, Keith Coates (1984). Trees of Southern Africa. Cape Town: Struik. pp. 736–737. ISBN   0-86977-081-0.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Palmer, Eve (1977). A Field Guide to the Trees of Southern Africa. London, Johannesburg: Collins. pp. 282–284. ISBN   0-620-05468-9.
  4. 1 2 3 4 5 6 Pooley, Elsa (1997). Trees of Natal, Zululand and Transkei. Durban: Natal Flora Publications Trust. p. 398. ISBN   0-620-17697-0.
  5. 1 2 3 4 5 Hyde, Mark; et al. "Euclea crispa (Thunb.) Sond. ex Gürke subsp. crispa". Flora of Zimbabwe. Retrieved 18 November 2013.
  6. 1 2 3 4 5 6 Stoll, Nicolette (Aug 2010). "Euclea crispa (Thunb.) Gürke subsp. crispa". PlantZAfrica.com. SANBI. Archived from the original on 2 August 2016. Retrieved 15 November 2013.
  7. 1 2 3 4 5 6 7 Tree Society of Southern Africa (1974). Trees and Shrubs of the Witwatersrand. Johannesburg: Witwatersrand University Press. pp. 134–135. ISBN   0-85494-236-X.
  8. 1 2 3 4 5 6 7 Van Wyk, Piet (1984). Field Guide to the Trees of the Kruger National Park. Cape Town: C. Struik. p. 224. ISBN   0-86977-221-X.
  9. 1 2 3 4 5 Van Wyk, Braam; et al. (1997). Field Guide to Trees of Southern Africa. Cape Town: Struik. p. 340. ISBN   1-86825-922-6.