Cussonia

Cussonia is a genus of plants of the family Araliaceae, which is native to the Afrotropics. It originated in Africa and has its center of distribution in South Africa and the Mascarene Islands. Due to their striking habit, they are a conspicuous and easily recognizable group of plants. Their genus name commemorates the botanist Pierre Cusson.[1] The Afro-Malagasy and Asian Schefflera, and Afrotropical Seemannaralia genera are related taxa that share several of its morphological characteristics, among which the leaves borne on the end of branches, inflorescences carried on terminal branches or stems, and reduced leaf complexity in developing inflorescences.[2]

Cabbage trees
Cussonia paniculata
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Apiales
Family: Araliaceae
Subfamily: Aralioideae
Genus: Cussonia
Thunb.
Species

See text

Synonyms

Range and habitat

They occur in grasslands, woodlands and forests, from sea level to over 2,000 metres in altitude. Geographically, they are indigenous to sub-Saharan Africa, Yemen in the Arabian Peninsula and the Comoro Islands.[2]

Habit and morphology

They are squat to lanky shrubs and trees with a palm-like habit. Their leaves are typically grouped in umbrella-shaped arrangements at the tips of long erect branches. The leaves are carried on long petioles, and have conspicuous stipules. The leaves are very variable in shape, often palmately compound (cf. subgenus Paniculata Strey)[2] with leaflets likewise variable in shape, but also simple or palmate. Their usually dense inflorescences are often spiked, and their small flowers usually have 5 greenish petals.[3] Their stems and underground parts are succulent,[2] and their bark is often corky.[4] These plants are best grown from seed. These plants can handle an occasional and mild frost, but a chill will make the leaves fall off.[5]

Species

There are some 20 to 22 species:[2][6]

  • Cussonia angolensis (Seem.) Hiern
  • Cussonia arborea Hochst. ex A.Rich.
  • Cussonia arenicola Strey
  • Cussonia bancoensis Aubrév. & Pellegr.
  • Cussonia brieyi De Wild.
  • Cussonia corbisieri De Wild.
  • Cussonia gamtoosensis Strey
  • Cussonia holstii Harms ex Engl.
  • Cussonia jatrophoides Hutchinson & E.A.Bruce
  • Cussonia natalensis Sond.
  • Cussonia nicholsonii Strey
  • Cussonia ostinii Chiov.
  • Cussonia paniculata Eckl. & Zeyh.
  • Cussonia sessilis Lebrun
  • Cussonia sphaerocephala Strey
  • Cussonia spicata Thunb.
  • Cussonia thyrsiflora Thunb.
  • Cussonia transvaalensis Reyneke
  • Cussonia zimmermannii Harms
  • Cussonia zuluensis Strey

References
  1. Gavhi, Peter; Harris, Shireen; Reynolds, Yvonne (October 2002). "Cussonia paniculata Eckl. & Zeyh". PlantZAfrica.com. SANBI. Retrieved 25 April 2017.
  2. de Villiers, Bernard J.; Tilney, Patricia M.; van Wyk, Ben-Erik (2010). "The taxonomic significance of leaf anatomical characters in Cussonia and related genera (Araliaceae)" (PDF). Botanical Journal of the Linnean Society (164): 246–263. doi:10.1111/j.1095-8339.2010.01085.x. Retrieved 25 April 2017.
  3. Hyde, M.; et al. "Cussonia". Flora of Zimbabwe. zimbabweflora.co.zw. Retrieved 25 April 2017.
  4. Thomas, Val; Grant, Rina; van Gogh, Joan (2004). Sappi tree spotting: Kwazulu-Natal and Eastern Cape. Johannesburg: Jacana. pp. 78–79. ISBN 9781770090385.
  5. "Araliaceae". succulent-plant.com. Retrieved 2018-02-07.
  6. "Cussonia". The Plant List, Version 1.1. 2013. Retrieved 25 April 2017.
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