Marsilea farinosa Launert
subsp. arrecta J.E. Burrows

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Common names:
Status: Native
Floating form: stipe up to 20 cm long. Leaflets up to 10-21 × 11-22 mm, broadly obdeltate, almost hairless,outer margin rounded, wavy. Dry land form: stipe up to 12 cm long, with bristly hairs. Leaflets up to 4-15 × 3-15 mm, obdeltate, set with a mixture of hairs, becoming subglabrous with age, outer margins lobed. Sporocarps: in clusters, bean-shaped, 4.5-7 mm long, 2.5-4.5 mm high, 1.5-2.25 mm thick, upper side straight or concave, under and outer side rounded, vertical cross-section rectangular; lateral ribs 8-11, not conspicuous in mature specimens; lower tooth absent or very shallow hump, upper tooth present, sharply obtuse to acute. Sporocarp densely covered with hairs of 2 kinds, erect and flattened appressed, which in the dried state cause the powdery greyish appearance of the sporocarp. Sporocarps set at an angle of 180° to the pedicel; pedicels 8-15 mm, erect or arching, free, arising from both the base of the stipe and the axils of the stipe, with bristly hairs.
Notes: It differs from other species by its hispid appearance created by the 2 kinds of hairs. It differs from M. farinosa subsp. farinosa by the angle at which the sporacarps are held to the pedicel: 90° in subsp. farinosa, 180° in subsp. arrecta
Derivation of specific name: farinosa: powdery or with meal-like covering, alluding to the greyish appearance created by the hairs that cover much of the plant.
arrecta: erect; referring to the erect sporocarps.
Habitat: In mud in seasonally flooded pans and man-made depressions.
Worldwide distribution: Botswana, South Africa
Botswana distribution: SE
Growth form(s): Aquatic, terrestrial.
Endemic status:
Red data list status:
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. Pages 73 - 74. (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 244 - 247. (Includes a picture).

Roux, J.P. (2001). Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13 Page 176.

Roux, J.P. (2009). Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands Page 56.

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 Marsilea farinosa subsp. arrecta:

External websites:

African Plants: A Photo Guide (Senckenberg): Marsilea farinosa
BHL (Biodiversity Heritage Library): Marsilea farinosa
EOL (Encyclopedia of Life): Marsilea farinosa
ePIC (electronic Plant Information Center): Marsilea farinosa
Flora Zambesiaca web site: Marsilea farinosa
GBIF (Global Biodiversity Information Facility): Marsilea farinosa
Google: Web - Images - Scholar
GRIN (Germplasm Resources Information Network): Marsilea farinosa
iNaturalist: Marsilea farinosa
IPNI (International Plant Names Index): Marsilea farinosa
JSTOR Plant Science: Marsilea farinosa
Kew Herbarium catalogue: Marsilea farinosa
Mansfeld World Database of Agricultural and Horticultural Crops: Marsilea farinosa
Plants of the World Online: Marsilea farinosa
Tropicos: Marsilea farinosa
Wikipedia: Marsilea farinosa

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2014-22

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2022). Flora of Botswana: Species information: Marsilea farinosa subsp. arrecta., retrieved 27 May 2022

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