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FNA | Family List | FNA Vol. 5 | Polygonaceae | Polygonum

8a. Polygonum fowleri B. L. Robinson subsp. fowleri Fowler's knotweed

renouée de Fowler

Polygonum allocarpum S. F. Blake

Plants rarely purple tinged, homophyllous or heterophyllous, subsucculent. Stems prostrate to ascending, 15-50 cm. Leaves: ocrea 4-12 mm; petiole 5-7 mm; blade green, rarely purple tinged, elliptic to elliptic-obovate, 20-35(-50) × 10-15(-25) mm, apex acute or obtuse; middle stem leaves 1.1-2.1(-3.4) times as long as adjacent branch leaves. Cymes 1-5-flowered. Pedicels 1-2.5 mm. Perianths 3-4.5 mm. Achenes broadly ovate, 3-gonous, (2.5-)3-3.7(-4.5) mm, faces subequal, concave, roughened, rarely obscurely tubercled. 2n = 40, 60.

Flowering Jul-Oct. Sandy, gravelly seashores; 0-30 m; St. Pierre and Miquelon; B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Yukon; Alaska, Calif., Maine, Oreg., Wash.


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