POLYGONACEAE
Polygonum amphibium L. var. emersum Michaux
also P. coccineum Muhlenb.
(kelp)

Hwy 1, 0.6 mi. north of Pidgeon Pt., San Mateo Co.
Coll. Malcolm Nobs & S. Galen Smith
August 26, 1949
Mason #192322
UCMP-SFES #64

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Morphology, Distribution, and Habitat (After Mason, 1957)

Achene lenticular, beaked with the persistent style base, deep reddish brown, shiny, and minutely punctate. The plant is found in ponds and swamps of valleys to middle altitudes in the mountains in southern California, north to British Colombia, and east to the Atlantic.