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GUNNERACEAE GUNNERA FAMILY

Livia Wanntorp & Elizabeth McClintock

Perennial herb, often large, terrestrial [semi-aquatic]; rhizome often with large scales. Stem: ± 0. Leaf: simple, generally alternate, often large; stipules 0; blades < to > petioles, ± round to reniform or ovate, generally toothed or lobed. Inflorescence: panicle (generally spikes along 1° axis), terminal or from upper axils, large; flowers many, often pistillate below, staminate above, bisexual between. Flower: very small, unisexual or bisexual; sepals generally 2 [± 0]; petals 2 [0]; stamens 1–2; ovary inferior, chamber 1, styles 2. Fruit: drupe.
1 genus, ± 35 species: Mexico, southern hemisphere, Hawaii; several cultivated. Rhizome scales previously interpreted as stipules. —Scientific Editor: Thomas J. Rosatti.

GUNNERA
(J.E. Gunner, Norwegian bishop, botanist, 1718–1773) [Wanntorp & De Craene 2005 Int J Plant Sci 166:945–953] Plants obtain fixed nitrogen from cyanobacteria (Nostoc) living just under surface of rhizomes, roots, in the only such symbiosis in angiosperms.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 2 2014
Citation for this treatment: [Author of taxon treatment] 2013. Gunnera, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=10106, accessed on Sep 2 2014

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