Isoetes schweinfurthii A. Braun ex Baker

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Synonyms: Calamaria schweinfurthii A. Braun ex Baker
Isoetes kersii Wanntorp
Isoetes rhodesiana Alston
Common names:
Status: Native
Pseudo-corms 3-lobed; bud scales dark brown to blackish, triangular-cuspidate, ± 6 × 4 mm. Leaves 5-40, narrow, stiff, 150-300 mm × c.1 mm (at apex) - c.10 mm (around sporangium), apex tapering to a point. Ligule narrowly triangular, sides convex, abruptly pointed, 2-6 mm long, pale, covered by a membranous serrate lip in the lower half. Velum absent. Sporangia 4-12 × 5-9 mm, oblong-obovate to circular. Megaspores 0.4-0.5 mm in diameter, ash-grey to whitish, upper surface almost smooth or with a few tubercles, lower tuberculate with conical warts.
Notes: I. alstonii is distinguished from I. schweinfurthii by its 2-lobed pseudo-corm. I. schweinfurhii is separated from I. aequinoctialis by lacking a velum.
Derivation of specific name: schweinfurthii: named after Dr Georg August Schweinfurth (1836-1925), German botanical collector and taxonomist.
Habitat: Shallow seasonally inundated pans in dry deciduous woodland or sometimes in sandy soils overlying sheetrock along river margins.
Altitude range: (metres) 880 - 1100 m
Worldwide distribution: Angola, central African Republic, Côte d' Ivoire, Ethiopia, Madagascar, Malawi, Morocco, Mozambique, Namibia, Senegal, South Africa, Sudan, Tanzania, Zambia, Zimbabwe.
Zimbabwe distribution: N,W,E,S
Growth form(s): Terrestrial.
Endemic status:
Red data list status: Data deficient
Insects associated with this species:
Spot characters: Display spot characters for this species

Burrows, J.E. (1990). Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 36. (Includes a picture).

Burrows, J.E. & Burrows, S.M. (1993). An annotated check-list of the pteridophytes of Malawi Kirkia 14(1) Page 81.

Burrows, J.E. & Willis, C.K. (eds) (2005). Plants of the Nyika Plateau Southern African Botanical Diversity Network Report No. 31 SABONET, Pretoria Page 34. (Includes a picture).

Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011). Ferns of Southern Africa, A comprehensive guide Struik Nature Pages 70 - 71. (Includes a picture).

Golding, J.S. (ed.) (2002). Zimbabwe Plant Red Data List. Southern African Plant Red Data Lists. SABONET 14 Page 180.

Jacobsen, W.B.G. (1983). The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 153 - 154. (Includes a picture).

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 7.

Roux, J.P. (2001). Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13 Pages 29 - 30.

Roux, J.P. (2009). Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands Page 10.

Schelpe, E.A.C.L.E. (1970). Pteridophyta Flora Zambesiaca Page 30. As Isoetes rhodesiana

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 15.

Other sources of information about Isoetes schweinfurthii:

Our websites:

Flora of Botswana: Isoetes schweinfurthii
Flora of Caprivi: cultivated Isoetes schweinfurthii
Flora of Malawi: Isoetes schweinfurthii
Flora of Mozambique: Isoetes schweinfurthii
Flora of Zambia: Isoetes schweinfurthii

External websites:

African Plants: A Photo Guide (Senckenberg): Isoetes schweinfurthii
African Plant Database: Isoetes schweinfurthii
BHL (Biodiversity Heritage Library): Isoetes schweinfurthii
EOL (Encyclopedia of Life): Isoetes schweinfurthii
GBIF (Global Biodiversity Information Facility): Isoetes schweinfurthii
Google: Web - Images - Scholar
iNaturalist: Isoetes schweinfurthii
IPNI (International Plant Names Index): Isoetes schweinfurthii
JSTOR Plant Science: Isoetes schweinfurthii
Mansfeld World Database of Agricultural and Horticultural Crops: Isoetes schweinfurthii
Plants of the World Online: Isoetes schweinfurthii
Tropicos: Isoetes schweinfurthii
Wikipedia: Isoetes schweinfurthii

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-24

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2024). Flora of Zimbabwe: Species information: Isoetes schweinfurthii., retrieved 20 July 2024

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