Searsia lucida

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Searsia lucida
Rhus lucida - leaves detail - Cape Town 8.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Anacardiaceae
Genus: Searsia
Species:
S. lucida
Binomial name
Searsia lucida
(L.) F.A.Barkley (1962-1963 publ. 1965)
Synonyms [1]
  • Rhus lucidaL. (1753)
  • Toxicodendron lucidum(L.) Kuntze (1891)

Searsia lucida, previously known as Rhus lucida, and commonly known as the varnished kuni-rhus (English) or blinktaaibos (Afrikaans). [2] [3]

Contents

Description

Leaf detail of Searsia lucida. Searsia lucida vorm lucida, vars loof, Krantzkloof NR.jpg
Leaf detail of Searsia lucida.

The tree seldom reaches a height of more than 2 metres and can spread as a shrub over several meters too.

The stems and branches are upright and erect. Young stems are red, shiny, resinous and sticky.

The leaves are shiny ("lucida" = "shiny"), trifoliate, leathery (sub-coriaceous), and a dark to olive green colour (often becoming orange before being shed).

The leaflets' shape is obovate-cuneate, often with small notches in their rounded tips. The leaflets are the same colour above and below, with a prominent central keel and fine lateral veins visible. Damaged leaf-surfaces become pale, almost white.

The leaf's petiole (stalk) is slightly winged, at least along its upper half.

It produces creamy-white flowers from June to October, in small, sparse, terminal inflorescences. The flowers are small, with petals less than 2 mm long.

It bears spherical fruits 4–5 mm in diameter, which are initially green and turn shiny brown as they mature (Oct-Nov). The fruits are eaten by birds. [4] [5]

This species closely resembles Searsia pallens and Searsia undulata , which co-occur over much of its distribution range.

The leaf of Searsia pallens also has a 10mm petiole that is slightly winged, but it has leaflets that are much longer (40mm) than they are wide (10mm). Its leaflets have 4 to 6 lateral veins per centimeter. Searsia pallens also has glossy fruits that are 4-5mm wide, but its fruits are elliptical-ovoid.
Searsia lucida in contrast, has a rounded fruit, and fewer lateral veins on its leaves (only 2 or 3 per centimeter). The leaflets of Searsia lucida are also broader and more oval in shape. [6] [7]

Distribution and habitat

This small tree has a distribution along the West Coast of South Africa from Saldanha Bay around the Cape and up the East Coast almost until the Mozambique border. Its distribution area also encompasses Lesotho and the whole of Kwazulu-Natal and stretches in an arm past Eswatini, right up the Lowveld areas of Mpumalanga and into Limpopo Province and Zimbabwe. [1]

It is found in scrub or forest areas from sea level to 2000 metres elevation.

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Branches dull brown or blackish, cylindric, pubescent or glabrous. Petiole 1·5–6·5 cm. long, almost cylindric, narrowly canaliculate and marginate above, pubescent or glabrous. Leaflets ± dull red-brown, ovate or ovate-lanceolate, acuminate, entire and ± undulate at the margin, membranous to ± rigid or subcoriaceous, glabrous or ± pubescent on the margin, midrib and nerves; median leaflet (3)6–13(16) × (1·2)2·5–4(7) cm., cuneate and frequently petiolulate at the base, the lateral ones (2)2·5–7(12) × (0·8)1·3–3·5(5·5) cm., asymmetric and slightly cuneate or somewhat rounded at the base, very shortly petiolulate to sessile; midrib slightly raised in the upper surface, very prominent below; lateral nerves arcuate, slender, raised on both sides, reticulation lax, almost invisible or sometimes conspicuous. Panicles terminal and axillary, ample, pyramidal, much branched, multiflorous, the terminal ones longer than the leaves, the axillary ones as long as the latter or somewhat longer; pedicels 1–2·5 mm. long. Male flowers: calyx-segments 0·5 mm. long, ovate, obtuse, glabrous; petals c. 1·5 mm. long, elliptic, obtuse; filaments c. 1 mm. long. Female flowers: ovary ovoid; styles reflexed; disk cupuliform, 5-lobulate; staminodes present. Drupe pinkish-yellow to reddish-brown, shining, (4)5(6) mm. in diam., globose, glabrous.

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References

  1. 1 2 Searsia lucida (L.) F.A.Barkley. Plants of the World Online . Retrieved 25 September 2023.
  2. "Searsia lucida (L.) F.A.Barkley forma lucida". Red List of South African Plants. SANBI. Retrieved 25 October 2014.
  3. Moffett, R.O. (2007) Name changes in the Old World Rhus and recognition of Searsia (Anacardiaceae). Bothalia 37(2):165–175
  4. Searsia lucida - SANBI
  5. Searsia lucida - Operation Wildflower
  6. Searsia pallens - Operation Wildflower
  7. Coates Palgrave, M. (2002) Trees of southern Africa. Struik, Cape Town.