Aconogonon davisiae |
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Davis' knotweed, Newberry's fleeceflower, Newberry's knotweed |
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Habit | Plants 12–42(–50) cm. | ||||
Stems | ascending to erect, glabrous or pubescent. |
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Leaves | ocrea reddish brown, funnelform, 0.3–3 cm, margins oblique, glabrous or finely pubescent to pilose; petiole 0.3–10(–15) mm; blade oblong-ovate to ovate, rarely broadly lanceolate, 2.1–7.5(–9.5) × 1.1–5 cm, subcoriaceous, base truncate or, rarely, cordate, margins entire, glabrous or ciliate, apex obtuse to acute, faces often glaucous, glabrous or pubescent. |
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Inflorescences | axillary, racemelike; peduncle essentially absent. |
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Pedicels | 0.5–1.9(–2.4) mm. |
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Flowers | 1–4 per ocreate fascicle, rarely some flowers with stamens poorly developed; perianth greenish to pinkish white, 2–4.5 mm; tepals slightly dimorphic or, rarely, distinctly so, oblong-ovate to obovate, apex obtuse; anthers yellow or pink. |
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Achenes | exserted, yellowish brown, not beaked distally, 3.2–6(–8.3) × 2.1–5 mm, shiny, faces not concave. |
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2n | = 20. |
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Aconogonon davisiae |
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Distribution |
CA; ID; OR; WA
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Discussion | Varieties 2 (2 in the flora). The varieties are largely sympatric and often intergrade. The treatment here follows Hong S. P. (1991). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 599. | ||||
Parent taxa | Polygonaceae > subfam. Polygonoideae > Aconogonon | ||||
Sibling taxa | |||||
Subordinate taxa | |||||
Synonyms | Polygonum davisiae, A. newberryi, Polygonum newberryi | ||||
Name authority | (W. H. Brewer ex A. Gray) Soják: Preslia 46: 151. (1974) | ||||
Web links |
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