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.

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

V5 1156-distribution-map.gif

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 +