UW Burke Herbarium species comparison

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Juncus acutus

Juncus acuminatus

knotty leaf rush, sharp-fruited rush, tapered rush
Habit Tufted perennial without rhizomes, the stems 4-8 dm. tall.
Leaves

Leaves alternate, semi-terete, hollow, with prominent partitions;

leaf bases sheathing, the margins of the sheaths free at the tip, forming rounded auricles.
Flowers

Inflorescence terminal, 5-12 cm. long, longer than the involucral bract, with 5-20 heads, the heads 5-8 mm. broad and 10- to 20-flowered;

perianth tawny or greenish-brown, 3-3.5 mm. long, the 6 segments subequal, lanceolate-acuminate;

stamens 3;

style 1 mm. long.
Fruits

Capsule equal to the perianth, narrowly ovoid, 3-angled, tapered to the tip.

Juncus acutus

Juncus acuminatus
Flowering time May-August
Habitat Ditches, lake margins, meadows and other wet places.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
J. acuminatus, J. alpinoarticulatus, J. anthelatus, J. articulatus, J. balticus, J. bolanderi, J. brachycarpus, J. brevicaudatus, J. breweri, J. bufonius, J. bulbosus, J. canadensis, J. compressus, J. confusus, J. conglomeratus, J. covillei, J. diffusissimus, J. drummondii, J. dudleyi, J. effusus, J. ensifolius, J. falcatus, J. filiformis, J. gerardi, J. hemiendytus, J. hesperius, J. howellii, J. inflexus, J. interior, J. kelloggii, J. laccatus, J. longistylis, J. mertensianus, J. nevadensis, J. nodosus, J. occidentalis, J. orthophyllus, J. oxymeris, J. parryi, J. patens, J. pelocarpus, J. pylaei, J. regelii, J. saximontanus, J. supiniformis, J. tenuis, J. tiehmii, J. torreyi, J. trilocularis, J. uncialis, J. vaseyi
J. alpinoarticulatus, J. anthelatus, J. articulatus, J. balticus, J. bolanderi, J. brachycarpus, J. brevicaudatus, J. breweri, J. bufonius, J. bulbosus, J. canadensis, J. compressus, J. confusus, J. conglomeratus, J. covillei, J. diffusissimus, J. drummondii, J. dudleyi, J. effusus, J. ensifolius, J. falcatus, J. filiformis, J. gerardi, J. hemiendytus, J. hesperius, J. howellii, J. inflexus, J. interior, J. kelloggii, J. laccatus, J. longistylis, J. mertensianus, J. nevadensis, J. nodosus, J. occidentalis, J. orthophyllus, J. oxymeris, J. parryi, J. patens, J. pelocarpus, J. pylaei, J. regelii, J. saximontanus, J. supiniformis, J. tenuis, J. tiehmii, J. torreyi, J. trilocularis, J. uncialis, J. vaseyi
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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