e-Key v3 - Mystroxylon
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Interactive keys to the identification of seed plants of southern Africa using keys based on plant morphology.

Celastraceae - Mystroxylon Eckl. & Zeyh.

Description :

  • Evergreen, rarely deciduous, shrubs or trees, unarmed, sparingly to densely pubescent; bark without yellow pigment, greyish to dark brown, surface smooth to longitudinally and transversely fissured; fissures often cutting deep into bark
  • Branchlets terete, smooth, usually pubescent, becoming greyish brown
  • Leaves alternate, coriaceous, margin glandular-crenate to glandular-crenulate, crenations 10-18 on either side; petiolate; stipules minute, ± triangular, pubescent, occasionally becoming glabrous, marcescent
  • Inflorescences sessile to pedunculate, composed of fasciculate cymes, axillary, 1-15-flowered; bracts minute
  • Flowers bisexual, pedicellate
  • Sepals 5, green, ± deltoid, with margin laciniate, equal, pubescent
  • Petals 5, greenish yellow, circular or depressed-ovate, margin entire or sparingly ciliolate, spreading
  • Disc fleshy, entire
  • Stamens 5, spreading, arising from and united at base with margin of disc; anthers introrse, dehiscing by longitudinal slits
  • Ovary three-quarters immersed in and adnate to and ± flush with disc, 3- or 4-locular, with 2 erect, collateral ovules per locule; style very short or absent, stigma inconspicuously lobed
  • Fruit a drupe, yellow-brown to bright red, ± spheroid; endocarp thin and crustaceous; mesocarp fleshy, the inner part often crustaceous or woody, resembling part of endocarp
  • Seed usually single, seed coat light brown, postchalazal vascular bundles often present; endosperm present; embryo erect, foliar

Nomenclature:

  • Mystroxylon Eckl. & Zeyh.
    • Ecklon & Zeyher: 125 (1834/1835)
    • Loesener: 176 (1942)
    • Robson: 29 (1965)
    • Robson: 376 (1966)
    • Robson et al.: 21 (1994)
    • Archer: 107 (1996)
    • Archer, Van Wyk & Condy: 76 (1997)
  • Mystroxylon Eckl. & Zeyh. sect. Eumystroxylon Loes.
    • Loesener: 178 (1942)

Distribution & Notes:

  • Global : Monotypic: Mystroxylon aethiopicum (Thunb.) Loes., a widespread and very polymorphic species in Africa and the Mascarene Islands
  • Southern Africa : 4 subspecies are recognised, Namibia, Botswana, Northern Province, Gauteng, Mpumalanga, Swaziland, KwaZulu-Natal, Western and Eastern Cape

References:

  • ARCHER, R.H. 1996. A taxonomic revision of southern African Cassinoideae ( Celastraceae ) . Ph.D. dissertation, University of Pretoria
  • ARCHER, R.H., VAN WYK, A.E. & CONDY, G. 1997. Mystroxylon aethiopicum subsp. schlechteri . Flowering Plants of Africa 55
  • ECKLON, C.F. & ZEYHER, K.L.P. 1834/1835. Celastrinae . Enumeratio plantarum africae australis extratropicae . Vol. 1. Perth & Besser, Hamburg
  • LOESENER, L.E.T. 1942. Die natürlichen Pflanzenfamilien 2,20b
  • ROBSON, N.K.B. 1965. Taxonomic and nomenclatural notes on Celastraceae . Boletim da Sociedade Broteriana , ser. 2, 39
  • ROBSON, N.K.B. 1966. Celastraceae . Flora zambesiaca 2
  • ROBSON, N.K.B., HALLÉ, N., MATHEWS, B. & BLAKELOCK, R. 1994. Celastraceae . Flora of tropical East Africa . Celastraceae