Polygonum polygaloides subsp. esotericum

(L. C. Wheeler) J. C. Hickman

Madroño 31: 251. 1984.

Common names: Modoc County knotweed
Endemic
Basionym: Polygonum esotericum L. C. Wheeler Rhodora 40: 310, fig. 1. 1938
Treatment appears in FNA Volume 5. Treatment on page 567. Mentioned on page 565.

Stems 5–12 cm. Inflorescences continuous from bases of branches or stems, narrowly cylindric, 2–10 × 5–7 mm; bracts appressed, elliptic-lanceolate, 4–8 mm, rigid, margins flat, green, if white then scarious portion 0.1–0.2 mm wide; lateral and midveins prominent adaxially. Flowers: perianth 2.1–2.9 mm; tube 29–40% of perianth length; tepals white or pink; perianth tube and base of tepals smooth; stamens 5–8. Achenes dark brown, lanceolate, 2–2.5 mm, reticulately ridged to almost smooth, dull.


Phenology: Flowering Jun–Aug.
Habitat: Vernal pools, seasonally wet places, desert scrub, pinyon and juniper woodlands
Elevation: 1400-1600 m

Discussion

Selected References

None.

Lower Taxa

None.
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
(L. C. Wheeler) J. C. Hickman +
Polygonum esotericum +
Modoc County knotweed +
Calif. +  and Oreg. +
1400-1600 m +
Vernal pools, seasonally wet places, desert scrub, pinyon and juniper woodlands +
Flowering Jun–Aug. +
Undefined sect. Duravia +  and Polygonum sect. Monticola +
Polygonum polygaloides subsp. esotericum +
Polygonum polygaloides +
subspecies +