OregonFlora species comparison

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Juncus marginatus

grass rush
Habit Plants perennial, 30–100 cm tall, cespitose, base with knobby tubers.
Leaves

flat, grasslike, green;

auricles 0.5–1.7 mm.
Inflorescences

5–40 clusters; clusters 3–10-flowered.
Flowers

tepals 6, brown to dark brown, red-spotted or not, papillose;

stamens 3;

filaments 1.1–1.8 mm;

anthers 0.3–1.3 mm; purplish red;

styles 0–0.3 mm.
Capsules

subglobose to obovoid; more or less obtuse; shorter or longer than the tepals, brown to dark brown, red-spotted or not, 3-chambered.
Seeds

0.4–0.6 × 0.15–0.2 mm, striate, apiculate.
2n

=38, 40.

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

Wet prairies, pastures, shores, ditches. 100–300m. Casc, WV. CA; scattered across North America; South America. Exotic.

Juncus marginatus is considered adventive in California as well as British Columbia and Oregon. The red-speckling on the tepals or capsules (when present) and knobby stem base are distinctive.
Source Flora of Oregon, volume 1, page 280
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. 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
Synonyms Juncus marginatus var. marginatus
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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