31.
Juncus orthophyllus
Coville, Contributions from the U. S. National Herbarium. 4: 207. 1893.
Straight-leaf rush
Juncus longistylis Torrey var. latifolius Engelmann, Trans. Acad. Sci. St. Louis 2: 496. 1868; J. latifolius (Engelmann) Buchenau 1890, not Wulfen 1789
Herbs, perennial, 2--4 dm. Rhizomes creeping. Culms compressed. Leaves: basal several, cauline 0--3; auricles, if present, 0.5--1 mm, apex acutish; blade flat, basal 10--40 cm x 1--6 mm, cauline blade reduced. Inflorescences glomerules, usually 3--12, each with 5--10 flowers, open; primary bract much shorter than inflorescence. Flowers: tepals brown, lanceolate, 5--6 mm, apex obtuse; outer series shorter, margins scarious, apex acute, minutely papillose; inner series with margins clear; stamens 6, filaments 0.5--1 mm, anthers 1.6--2.4(--3) mm; style 0.5--2 mm. Capsules tan, 3-locular, obovoid, 3--5 mm, shorter than perianth. Seeds ovoid, 0.6 mm, not tailed.
Flowering and fruiting late spring to summer. Moist ground in mountain meadows; 1200--3500 m; B.C.; Calif., Idaho, Mont., Nev., Oreg., Wash.
