OregonFlora species comparison

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Juncus ranarius

frog rush
Habit Plants annual, 3–10(17)cm tall, branched.
Leaves

usually less than 1 mm wide;

stem leaves usually 1–2.
Inflorescences

cymose;

flowers solitary at nodes.
Flowers

tepals 6, green to light brown;

outer tepals usually 4–5 mm; inner more or less blunt;

stamens 6;

filaments 0.7– 1.5 mm;

anthers 0.4–0.8 mm;

styles 0.3–0.4 mm.
Capsules

usually truncate (blunt to subacute); (shorter than) more or less equaling inner tepals, brown, 1-chambered.
Seeds

0.35–0.5 × 0.25–0.35 mm, apiculate.
2n

=34.

Juncus ranarius
Distribution
Discussion

Moist clay, stream banks, disturbed wet ground. 0–2000m. BR. CA; scattered across North America; North Africa, Eurasia. Exotic.

Juncus ranarius is similar to J. bufonius, as well as Eurasian J. ambiguus, a misapplied name in our flora. The taxonomy of these species is controversial (Balslev 1996), and the complex needs worldwide revision. It is presumably exotic in North America and easily overlooked.
Source Flora of Oregon, volume 1, page 283
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. regelii, J. saximontanus, J. supiniformis, J. tenuis, J. tiehmii, J. torreyi, J. triglumis, J. trilocularis, J. uncialis
Synonyms Juncus ambiguus, Juncus bufonius var. halophilus
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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