Adenostemma viscosum J.R. Forst. & G. Forst.

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Mount Mberengwa

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Synonyms:	Adenostemma perrottetii DC.
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Description:	Erect to semi-procumbent herb up to 1.3 m; stem fleshy, hairless or sparsely pubescent, sometimes rooting from lower nodes. Leaves ovate to rhomboid, 2–20 cm long, 3-veined from base, hairless or almost so, base sometimes forming narrow wings along petiole; margin crenulate to serrate; petiole 0.7–4 cm long. Inflorescence bracts 0.6–5 cm long at nodes of inflorescence branches. Capitula few to many, c. 3–5 mm long, 4–5 mm diameter when mature; stalks of individual capitula 1.2–2.5 cm, glandular-pubescent; phyllaries 2–3 mm long, flat; margins entire or ciliate, pubescent near the base. Florets c. 30–42, white, 1–1.5 mm long. Achenes 2.2–3 mm long, becoming brown, tuberculate and glandular with maturity; pappus of 3 pegs, less than 1 mm long.
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Derivation of specific name:	viscosum: viscid, sticky
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Worldwide distribution:	Widespread in Africa, Mascarenes, India, Sri Lanka, Indonesia, Australia, and Pacific Islands.
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Spot characters:	Display spot characters for this species
Literature:	Beentje, H.J. & Ghazanfar, S.A. (eds.) (2005). Compositae (Part 3) Flora of Tropical East Africa Pages 820 - 821. Da Silva, M.C., Izidine, S. & Amude, A.B. (2004). A preliminary checklist of the vascular plants of Mozambique. Southern African Botanical Diversity Network Report No. 30 Sabonet, Pretoria Page 29. 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 23. as Adenostemma perrottetii Phiri, P.S.M. (2005). A Checklist of Zambian Vascular Plants Southern African Botanical Diversity Network Report No. 32 Page 27. Timberlake, J.R. & Childes, S.L. (2004). Biodiversity of the Four Corners Area: Technical Reviews Volume Two (Chapter 5-15) Appendix 5-1: Plant Checklist Occasional Publications in Biodiversity 15 Page 198. as Adenostemma perrottetii

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Flora of Caprivi: Adenostemma viscosum
Flora of Malawi: Adenostemma viscosum
Flora of Mozambique: Adenostemma viscosum
Flora of Zambia: Adenostemma viscosum
Flora of Zimbabwe: Adenostemma viscosum

External websites:

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