OregonFlora species comparison

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Juncus trilocularis

foothill rush
Habit Plants perennial, 10–78 cm tall, cespitose, lacking strong stem ridges.
Leaves

thin and wiry;

blade flat and slightly inrolled;

auricles soft and thin distally, 0.3–3 mm; dull, rounded or acute; dirty white.
Inflorescences

cymes, 2–20 cm, usually open;

bractlets subtending flowers acute to acuminate, often aristate.
Flowers

tepals 6, 3.3–5.1 mm; greenish to pale brown, nearly concolorous;

tips acuminate;

outer tepals distinctly longer than inner tepals;

stamens 6;

filaments 0.5–0.8 mm;

anthers (0.6)0.8–1.7 mm;

styles 0.3–1 mm.
Capsules

2.8–4.1 mm; shorter than the tepals, pale brown to dark brown;

apex truncate to notched (acute), crested, 3-chambered.
Seeds

0.4–0.6 × 0.2–0.3 mm, apiculate, reticulate.

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

Seasonally damp meadows, springs, shores, creek banks, moist open forest, ditches. 300–1900m. BW, Col, ECas, Owy, Sisk, Casc. CA, ID, NV, WA. Native.

This is an uncommon species found east of the Cascade Range and in the Siskiyou Mountains that has long been confused with Juncus brachyphyllus, a plant of grasslands and glades in the Midwest, which occurs no further west than Nebraska.
Source Flora of Oregon, volume 1, page 284
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. uncialis
Synonyms Juncus brachyphyllus
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Unless otherwise noted, all data comes from OregonFlora.



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