familyPolygonaceae
subfamilyPolygonaceae subfam. Polygonoideae
genusPolygonum
sectionPolygonum sect. Polygonum
speciesPolygonum fowleri
subspeciesPolygonum fowleri subsp. fowleri
Polygonum fowleri subsp. fowleri
Common names: Fowler’s knotweed renouée de Fowler
IllustratedEndemic
Synonyms: Polygonum allocarpum S. F. Blake
Treatment appears in FNA Volume 5. Treatment on page 555.
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.
Phenology: Flowering Jul–Oct.
Habitat: Sandy, gravelly seashores
Elevation: 0-30 m
Distribution
Loading map...
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.
Discussion
Selected References
None.
Lower Taxa
None.