Pilea rivularis Wedd.

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Zovo Chipolo Forest, Nyika National Park

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Synonyms:	Pilea ceratomera Wedd. Pilea comorensis Engl. Pilea macrodonta Baker Pilea stipulata Hutch. & Dalz. Pilea worsdellii N.E. Br.
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Description:	Perennial herb with erect unbranched stems up to 50 cm high, growing from a creeping rhizome. Leaves opposite, more or less equal in size, more or less broadly ovate, mostly 2-5 cm long, hairless on both surfaces but with linear outgrowths of the epidermal cell walls (cystoliths); margin with 5-15 teeth each side; petiole 4-6 cm long. Stipules broadly ovate, up to 5 mm long, often cordate and clasping the stem. Inflorescences in dense axillary clusters, unisexual with sexes on different plants or at least on each stem.
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Worldwide distribution:	Nigeria, Cameroon, Bioko, DRC, Burundi, Rwanda, Uganda, Sudan, Ethiopia, Kenya, Tanzania, Malawi, Mozambique, Zambia, South Africa. Also in Madagascar and Comoro.
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Literature:	Burrows, J.E. & Willis, C.K. (eds) (2005). Plants of the Nyika Plateau Southern African Botanical Diversity Network Report No. 31 SABONET, Pretoria Page 280. Friis, I. (1991). Urticaceae Flora Zambesiaca 9(6) Pages 98 - 99. Harris, T., Darbyshire, I. & Polhill, R. (2011). New species and range extensions from Mt Namuli, Mt Mabu and Mt Chiperone in northern Mozambique Kew Bulletin 66(2) Page 250. Phiri, P.S.M. (2005). A Checklist of Zambian Vascular Plants Southern African Botanical Diversity Network Report No. 32 Page 101. Strugnell, A.M. (2006). A Checklist of the Spermatophytes of Mount Mulanje, Malawi Scripta Botanica Belgica 34 National Botanic Garden of Belgium Page 182.

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Flora of Malawi: Pilea rivularis
Flora of Mozambique: Pilea rivularis
Flora of Zambia: Pilea rivularis

External websites:

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