OregonFlora species comparison

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Juncus canadensis

Juncus capitatus

Canada rush, Canadian rush

capitate rush, leafybract dwarf rush
Habit Plants perennial, 30–100 cm tall, cespitose. Plants annual, 2–13.5 cm tall, unbranched.
Leaves

basal and cauline; round; hollow, septate, 1–2 mm wide;

auricles 1–1.2 mm.

capillary;

basal.
Inflorescences

panicles of 3–50 clusters; clusters 5–50-flowered, not obscured by inflorescence bract.

1(3) terminal head-like clusters, 2–15(26) flowers per cluster;

inflorescence bracts leafy and longer than inflorescence.
Flowers

tepals 6, green; reddish, or pale brown;

tips acuminate;

stamens 3;

filaments 0.8–1.5 mm;

anthers 0.3–0.5 mm;

styles 0.2–0.3 mm.

tepals 6, brown; outer longer than and more acuminate than the inner;

stamens 3;

filaments 0.6–1.3 mm;

anthers 0.2–0.6 mm;

styles 0.3–0.5(1) mm.
Capsules

usually 0–1 mm longer than the tepals, dark brown, 1-chambered.

shorter than the tepals, brown; reddish brown or dark brown.
Seeds

narrowly ellipsoid to linear, 1.25–1.9 × 0.2–0.25 mm;

bodies 0.5– 0.8 mm; tails 0.3–0.5 mm, 0.5–1 times as long as seed body.

0.25–0.35 × 0.15–0.2 mm, slightly reticulate (at 10×).
2n

=80.

=18.

Juncus canadensis

Juncus capitatus
Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Shores, ponds, peatlands, disturbed sandy acidic wet ground, cranberry farms, ditches. 0–100 m. Est. WA; north to British Columbia; eastern North America; Europe, New Zealand. Exotic.

This species was introduced by cranberry agriculture and is spreading into natural wetlands. Some authors suggest rare flowers have 6 stamens.

Moist bare ground. 50–1000 m. Est. CA; southeastern US, South America; Africa, Australia, Eurasia, New Zealand. Exotic.

This species was discovered in Oregon in 2010 on the Oregon Islands National Wildlife Refuge by Dave and Diane Bilderback. The large involucral bract is distinctive among our annuals.
Source Flora of Oregon, volume 1, page 273
Peter Zika		 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. 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. 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
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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