OregonFlora species comparison

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Juncus diffusissimus

Juncus tiehmii

slim pod rush

Tiehm's dwarf rush
Habit Plants perennial, 25–65 cm tall, cespitose. Plants annual, 0.5–6 cm tall, unbranched.
Leaves

round; hollow, septate;

auricles 1–3 mm.

capillary;

basal.
Inflorescences

open; clusters 20–70; clusters 2–5(10)-flowered.

1–4(7) flowers in a terminal cluster;

flowers subtended by 2 bractlets;

tips acute.
Flowers

tepals 6, 2–3.2 mm, green or pale brown;

stamens 3;

filaments 0.6–0.9 mm;

anthers 0.4–0.5 mm;

styles 0–0.1 mm.

tepals usually 4, pale green or pink;

stamens 2(3);

filaments 0.6–0.9 mm;

anthers 0.3–0.4 mm;

styles 0.1– 0.3 mm.
Capsules

4–5.2 mm, 0.5–2 mm longer than the tepals, pale brown or reddish, often with metallic or bronzy gloss, 1-chambered.

usually elliptic to oblong, equaling or longer than the tepals, pale green or pink.
Seeds

ellipsoid to ovoid, 0.3–0.4 × 0.2–0.3 mm, apiculate, reticulate.

up to 7 per chamber, 12–30 per capsule, 0.3–0.5 × 0.2–0.3 mm, longitudinally striate (at 10×).
2n

=34.

Juncus diffusissimus

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

Moist river banks, wet disturbed gravel. 0–1000 m. Est. CA, WA; southeastern US; South America. Exotic.

Damp depressions, stream banks, sunny floodplains. 1000– 2000m. BR, ECas. CA, NV, ID, WA; south to Mexico. Native.

Plants with few seeds per capsule have larger seeds, and thus some specimens might suggest J. capillaris, but there is no overlap. Juncus capillaris always has fewer than 10 seeds per capsule.
Source Flora of Oregon, volume 1, page 275
Peter Zika		 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. 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. 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. torreyi, J. triglumis, J. trilocularis, J. uncialis
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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