OregonFlora: Juncus compressus

	Juncus compressus
	round-fruited rush
Habit	Plants perennial, 10–40 cm tall, cespitose, stems with 0–1 strong ridges visible on one side.
Leaves	thin and wiry; blade flat and slightly inrolled; auricles 0.3–0.5 mm.
Inflorescences	cymose, 1.5–8 cm; loose or congested, never hidden by inflorescence bract; bract not swollen at base; flowers solitary at the nodes, subtended by 2 bractlets.
Flowers	tepals 6, often dark brown- or black-striped; tips blunt, hooded and incurved; stamens 6; filaments 0.4–0.7 mm, subequal to anthers 0.4–1 mm; anther/filament ratio usually 0.67– 2; styles 0.2–0.4 mm.
Capsules	2.5–3.5 mm; longer than the tepals, brown to dark brown; apex rounded to truncate, not crested, 1-chambered.
Seeds	0.35–0.6 × 0.2–0.25 mm, apiculate, reticulate.
2n	=44.

	Juncus compressus
Distribution	[WildflowerSearch map] [BONAP county map]
Discussion	Shores, damp pastures, often saline soil. 0–100 m. Col, WV. Northern North America; Eurasia. Exotic. Both J. compressus and J. gerardi are easily separated from other species in Group 5 by the hooded, dark-striped tepals.
Source	Flora of Oregon, volume 1, page 274 Peter Zika
Sibling taxa	J. acuminatus, J. anthelatus, J. articulatus, J. balticus, J. bolanderi, J. brevicaudatus, J. breweri, J. bryoides, J. bufonius, J. bulbosus, J. canadensis, J. capillaris, J. capitatus, J. confusus, J. conglomeratus, J. covillei, J. diffusissimus, J. drummondii, J. dudleyi, J. effusus, J. ensifolius, J. ensifolius x Juncus nevadensis, J. exiguus, J. falcatus, J. filiformis, J. gerardi, J. hemiendytus, J. hesperius, J. howellii, J. inflexus, J. interior, J. kelloggii, J. laccatus, J. lescurii, J. longistylis, J. marginatus, J. mertensianus, J. mexicanus, J. nevadensis, J. occidentalis, J. orthophyllus, J. oxymeris, J. parryi, J. patens, J. pelocarpus, J. planifolius, J. ranarius, J. regelii, J. saximontanus, J. supiniformis, J. tenuis, J. tiehmii, J. torreyi, J. triglumis, J. trilocularis, J. uncialis
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search