Aconogonon davisiae var. davisiae |
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 | pubescent, rarely glabrescent. |
ascending to erect, glabrous or pubescent. |
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Leaves | blades 2.1–7.5(–9.5) × 1.1–5 cm, base truncate or, rarely, cordate, faces pubescent, rarely glabrescent. |
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 | 0.5–1.7(–2.4) mm, glabrous. |
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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Perianths | 2–4.5 mm. |
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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. |
= 20. |
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Aconogonon davisiae var. davisiae |
Aconogonon davisiae |
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Phenology | Flowering Jun–Aug. | |||||
Habitat | Steep subalpine slopes, volcanic fell fields, often on talus or pumice | |||||
Elevation | 1200-3100 m (3900-10200 ft) | |||||
Distribution |
CA; ID; OR; WA |
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. 600. | FNA vol. 5, p. 599. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Polygonum davisiae, A. newberryi, Polygonum newberryi | |||||
Name authority | unknown | (W. H. Brewer ex A. Gray) Soják: Preslia 46: 151. (1974) | ||||
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