OregonFlora species comparison

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Juncus acutus

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 acutus

Juncus compressus
Distribution
[WildflowerSearch map]
[BONAP county map]
[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. compressus, 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
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 
Unless otherwise noted, all data comes from OregonFlora.



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