Juncus occidentalis

(Coville) Wiegand
Bulletin of the Torrey Botanical Club 27: 521. 1900.
Common names: Western rush
Endemic
Basionym: Juncus tenuis var. occidentalis Coville Proc. Biol. Soc. Wash. 10: 129. 1896
Synonyms: Juncus tenuis var. congestus Engelmann
Treatment appears in FNA Volume 22.

Herbs, perennial, cespitose, 3–6 dm. Rhizomes densely branching. Culms few–20. Leaves basal, (1–)2–3; auricles 0.5–1(–1.5) mm, apex acutish, membranous; blade flat, 5–15 cm × 0.5–1.3 mm, margins entire. Inflorescences 5–50-flowered, somewhat loose, 1–7 cm; primary bract usually longer than inflorescence. Flowers: bracteoles 2; tepals greenish, lanceolate, (3.5–)5 mm; outer and inner series nearly equal; stamens 6, filaments 0.5–1 mm, anthers 0.1–0.3 mm; style 0.1–0.2 mm. Capsules light brown, 1-locular to pseudo-3-locular, ellipsoid, (3–)5–4.5 × 1.2–1.8 mm, nearly equal to shorter than tepals. Seeds tan, ellipsoid to lunate, 5.5–0.7 mm, not tailed. 2n = 80.


Phenology: Flowering spring–early summer.
Habitat: Moist, usually exposed sites in clayey or sandy soil around springs, along rivers and streams, and around lakes
Elevation: below 2300 m

Distribution

V22 572-distribution-map.jpg

Ariz., Calif., Idaho, Nev., Oreg., Wash.

Discussion

Juncus occidentalis should perhaps be considered a robust variant of J. tenuis.

Selected References

None.

Lower Taxa

None.

... more about "Juncus occidentalis"
Ralph E. Brooks* +  and Steven E. Clemants* +
(Coville) Wiegand +
Juncus tenuis var. occidentalis +
Western rush +
Ariz. +, Calif. +, Idaho +, Nev. +, Oreg. +  and Wash. +
below 2300 m +
Moist, usually exposed sites in clayey or sandy soil around springs, along rivers and streams, and around lakes +
Flowering spring–early summer. +
Bulletin of the Torrey Botanical Club +
Juncus tenuis var. congestus +
Juncus occidentalis +
Juncus subg. Poiophylli +
species +