Family:
Fabaceae Lindl.

Vachellia seyal (Delile) P.J.H.Hurter

This species is accepted, and its native range is Sahara to Eritrea and Zambia, Arabian Peninsula.

[FSOM]

M. Thulin et al. Flora of Somalia Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Tree up to 9 m high with usually flattened crown; young branchlets almost glabrous, epidermis reddish, conspicuously flaking off to expose a greyish or reddish powdery under-surface
Morphology General Bark
Bark on trunk powdery, white to greenish yellow or orange red
Morphology General Spines
Stipular spines up to 8 cm long, some sometimes basally inflated and fused into bilobed “ant-galls”
Morphology Leaves
Pinnae 3–7 pairs; leaflets 11–20 pairs, 3–8 x 0.7–1.5 mm
Morphology Reproductive morphology Flowers
Flowers bright yellow, in heads; involucel in lower half of peduncle, often subtending a few additional flowers
Morphology Reproductive morphology Flowers Calyx
Calyx 2–2.5 mm long
Morphology Reproductive morphology Flowers Corolla
Corolla 3.5–4 mm long
Morphology Reproductive morphology Fruits
Pods ± falcate and constricted between the seeds, dehiscent, 7–20 x 0.5–0.9 cm, finely longitudinally veined, glabrous
Morphology Reproductive morphology Seeds
Seeds elliptic, compressed, 7–9 x 4.5–5 mm; areole 5–6 x 2.5–3.5 mm.

[FWTA]

Mimosaceae, Hutchinson and Dalziel. Flora of West Tropical Africa 1:2. 1958

Morphology General Habit
Loosely branched, more or less flat-topped tree, to 40 ft. high
Morphology General Bark
Bark of young branchlets reddish-brown, soon flaking off to expose a powdery surface; bark of older stems covered with pale yellow to red powder, exfoliating in subrectangular pieces green at first but becoming brown
Note
Trees of similar size in the same area often show the full range of colour
Morphology Reproductive morphology Flowers
Flowers bright yellow
Morphology Reproductive morphology Fruits
Fruits split and remain on the tree.

[FZ]

Leguminosae, J.P.M. Brenan. Flora Zambesiaca 3:1. 1970

Morphology General Habit
Tree (2)3-9(12) m. high; bark on trunk powdery, white to greenish-yellow or orange-red; young branchlets with few sparse hairs to almost glabrous and with numerous reddish sessile glands (rarely, and not in our area, rather densely puberulous); epidermis of twigs becoming reddish and conspicuously flaking off to expose a greyish or ± reddish powdery bark.
Morphology Leaves Stipules
Stipules spinescent, up to 8 cm. long; “ant-galls” present or not; other prickles absent.
Morphology Leaves
Leaves often with a rather large gland on the petiole and between the top 1-2 pairs of pinnae; pinnae (2)3-7(8) pairs; leaflets (7)11-20 pairs, 3-8(10) x 0·75-1·5(3) mm., in our area sparingly ciliolate to glabrous; lateral nerves invisible beneath.
Morphology Reproductive morphology Flowers
Flowers bright-yellow, in axillary pedunculate heads 10-13 mm. in diam. borne on terminal or short lateral shoots of the current season; involucel in the lower half of the peduncle, 2-4 mm. long; apex of bracteoles rounded to elliptic, sometimes pointed.
Morphology Reproductive morphology Flowers Calyx
Calyx 2-2·5 mm. long, inconspicuously puberulous in upper part.
Morphology Reproductive morphology Flowers Corolla
Corolla 3·5-4 mm. long, glabrous outside.
Morphology Reproductive morphology Fruits
Pods dehiscent, (5)7-20(22) x 0·5-0·9 cm., linear, ± falcate, ± constricted between the seeds, finely longitudinally veined, glabrous except for some sessile glands.
Morphology Reproductive morphology Seeds
Seeds olive to olive-brown, 7-9 x 4·5-5 mm., faintly and minutely wrinkled, elliptic, compressed; areole 5-6 x 2·5-3·5 mm.

[ILDIS]

International Legume Database and Information Service

Conservation
Not Threatened
Ecology
Africa: Somalia-Masai bushland and thicket, Sudanian woodland, Zambezian wooded grassland, Somalia-Masai wooded grasslands., Sahel regional transition zone; bushland and thicket
Morphology General Habit
Perennial, Not climbing, Shrub/Tree
Vernacular
Gum Arabic Tree, Shittim Wood, Thirty Thorn, Whistling Tree

[FTEA]

Leguminosae, J. B. Gillett, R. M. Polhill & B. Verdcourt. Flora of Tropical East Africa. 1971

Morphology General Habit
Tree 3–9 (–12) m. high; bark on trunk powdery, white to greenish-yellow or orange-red.
Morphology Branches
Young branchlets almost glabrous and with numerous reddish sessile glands (rarely, and not in E. Africa, rather densely puberulous); epidermis of twigs becoming reddish and conspicuously flaking off to expose a greyish or ± reddish powdery bark.
Morphology Leaves Stipules
Stipules spinescent, up to 8 cm. long; “ant-galls” present or not; other prickles absent.
Morphology Leaves
Leaves often with a rather large gland on the petiole and between the top 1–2 pairs of pinnae; pinnae (2–)3–7(–8) pairs; leaflets (7–)11–20 pairs, 3–8(–9) mm. long, 0.75–1.5(–3) mm. wide, in our area sparingly ciliolate to glabrous; lateral nerves invisible beneath.
Morphology Reproductive morphology Flowers
Flowers bright yellow, in axillary pedunculate heads 10–13 mm. in diameter; involucel in lower half of peduncle, 2–4 mm. long; apex of bracteoles rounded to elliptic, sometimes pointed.
Morphology Reproductive morphology Flowers Calyx
Calyx 2–2.5 mm. long, inconspicuously puberulous above.
Morphology Reproductive morphology Flowers Corolla
Corolla 3.5–4 mm. long, glabrous outside.
Morphology Reproductive morphology Fruits
Pods (Fig. 15/32, p. 66) dehiscent, linear, ± falcate, ± constricted between the seeds, finely longitudinally veined, glabrous except for some sessile glands, (5–)7–20(–22) cm. long, 0.5–0.9 cm. wide.
Morphology Reproductive morphology Seeds
Seeds olive to olive-brown, faintly and minutely wrinkled, elliptic, compressed, 7–9 mm. long, 4.5–5 mm. wide; areole 5–6 mm. long, 2.5–3.5 mm. wide.

[ILDIS]
Use
Chemical products, Environmental, Forage, Miscellaneous, Wood

Doubtfully present in:

Mauritania

Native to:

Algeria, Benin, Burkina, Burundi, Cameroon, Central African Repu, Chad, Djibouti, Egypt, Eritrea, Ethiopia, Gambia, Ivory Coast, Kenya, Mali, Mozambique, Niger, Nigeria, Saudi Arabia, Senegal, Somalia, Sudan, Tanzania, Uganda, Yemen, Zambia

Introduced into:

Florida, Honduras, Texas

Vachellia seyal (Delile) P.J.H.Hurter appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Schimper [218], Ethiopia Acacia seyal K000244219
Mndolwa [44], Tanzania Acacia seyal K001091547
Friis, I. [14027], Ethiopia Acacia seyal K001259678

First published in D.J.Mabberley, Plant-book, ed. 3: 1021 (2008)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Kew Backbone Distributions

  • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
  • Audru, J., Cesar, J. & Lebrun, J.-P. (1994). Les Plantes Vasculaires de la République de Djibouti. Flore Illustrée 1: 1-336. CIRAD, Départerment d'Elevage et de Médecine vétérinaire, Djibouti.
  • Berhaut, J. (1975). Flore illustrée du Sénégal 4: 1-625. Gouvernement du Sénégal, Ministère du développement rural direction des eaux et forêta, Dakar.
  • Boulvert, Y. (1977). Catalogue de la Flore de Centrafrique 3: 1-89. ORSTROM, Bangui.
  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
  • Dobignard, A. & Chatelain, C. (2012). Index synonymique de la flore d'Afrique du nord 4: 1-431. Éditions des conservatoire et jardin botaniques, Genève.
  • Hedberg, I. & Edwards, S. (eds.) (1989 publ. 1990). Flora of Ethiopia and Eritrea 3: 1-659. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
  • Isely, D. (1998). Native and Naturalized Leguminosae (Fabaceae) of the United States: 1-1007. Monte L. Bean Life Science Museum. Brigham Young University, Provo, Utah.
  • Jones, M. (1991). A checklist of Gambian plants: 1-33. Michael Jones, The Gambia College.
  • Kalema, J. & Beentje, H. (2012). Conservation checklist of the trees of Uganda: 1-235. Kew Publishing, Royal Botanic Gardens, Kew.
  • Lebrun, J.p., Toutain, B., Gaston, A. & Boudet, G. (1991). Catalogue des Plantes Vasculaires du Burkina Faso: 1-341. Institut d' Elevage et de Médecine Vétérinaire des Pays Tropicaux, Maisons Alfort.
  • Milgahid, A.M. (1989). Flora of Saudi Arabia, ed. 3, 2: 1-282. University Libraries, King Saud University, Riyadh, Saudi Arabia.
  • Wood, J.R.I. (1997). A handbook of the Yemen Flora: 1-434. Royal Botanic Gardens, Kew.
  • de Lourdes Rico-Acre, M. (2007). A checklist and synopsis of American species of Acacia (Leguminosae: Mimosoideae): 1-207. CONABIO, México D.F.

  • Flora Zambesiaca

    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of Somalia

    Flora of Somalia
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of Tropical East Africa

    Flora of Tropical East Africa
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of West Tropical Africa

    Flora of West Tropical Africa
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • International Legume Database and Information Service

    International Legume Database and Information Service (ILDIS) V10.39 Nov 2011
    http://creativecommons.org/licenses/by/3.0

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Wood Anatomy Microscope Slides

    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by-nc-sa/3.0/