Polygonum polygaloides subsp. confertiflorum

(Nuttall ex Piper) J. C. Hickman

Madroño 31: 251. 1984.

Endemic
Basionym: Polygonum confertiflorum Nuttall ex Piper Contr. U.S. Natl. Herb. 11: 228. 1906
Synonyms: Polygonum kelloggii var. confertiflorum (Nuttall ex Piper) Dorn Polygonum watsonii Small
Treatment appears in FNA Volume 5. Treatment on page 566. Mentioned on page 565.
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Stems 2–15 cm. Inflorescences mostly confined to tips of branches, rarely interrupted and continuous from bases of branches or stems, ovoid to cylindric, 7–40 × 5–10 mm; bracts ascending to appressed, linear to linear-lanceolate, 4–11 mm, moderately rigid to rigid, margins revolute, white, scarious portion 0.25–0.4 mm wide; midvein moderately to heavily thickened, lateral veins inconspicuous. Flowers: perianth 1.8–2.2(–2.4) mm; tube 22–30% of perianth length; tepals white or red; perianth tube and base of tepals smooth or, sometimes, papillose; stamens 3. Achenes brown to dark brown, ovate-lanceolate to ovate, 1.5–2 mm, reticulate with longitudinal ridges, dull.


Phenology: Flowering May–Aug.
Habitat: Vernal pools, wet meadows
Elevation: 500-1900 m

Distribution

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Alta., B.C., Sask., Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
(Nuttall ex Piper) J. C. Hickman +
Polygonum confertiflorum +
Alta. +, B.C. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
500-1900 m +
Vernal pools, wet meadows +
Flowering May–Aug. +
Polygonum kelloggii var. confertiflorum +  and Polygonum watsonii +
Polygonum polygaloides subsp. confertiflorum +
Polygonum polygaloides +
subspecies +