OregonFlora species comparison

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Juncus interior

Juncus lescurii

interior juncus

San Francisco rush
Habit Plants perennial, (11)20–60 cm tall, cespitose, base usually pink, 4–6 strong stem ridges visible per side. Plants perennial, 40–140 cm tall, rhizomatous, fresh stems usually round and erect, usually not twisted, smooth, with 12–30 weak ridges visible per side when dried.
Leaves

thin and wiry;

blade flat and slightly inrolled;

auricles soft, 2-textured, usually thicker proximally and more opaque than thin distal margin, 0.4–0.8(1.2)mm; dirty white to translucent; dull, rounded.

lacking blades;

distal sheaths 5–12 cm, green to dark brown or blackish distally; dull or slightly shiny; smooth;

apex symmetrical; thin, not winged.
Inflorescences

cymes, 1.5– 7 cm;

bractlets subtending flowers acuminate to aristate.

variable; a loose or sparse cluster, often lobed; at least some branches usually visible;

inflorescence bracts not swollen.
Flowers

tepals 6, light brown;

tepal tips acuminate;

stamens 6;

filaments 0.8–1.1 mm;

anthers 0.3–0.7(0.9) mm;

styles 0.1–0.4(0.5)mm.

tepals 6, usually 6–8 mm, dark brown-striped;

stamens 6;

filaments 0.3–0.9 mm;

anthers 0.9–2.3 mm;

styles 1–1.8 mm.
Capsules

3.3–4.7 mm; longer than the tepals, light brown;

apex obtuse to truncate, not ridged or crested, 1-chambered.

4–5 mm; shorter than the tepals, dark brown;

apex acute, 1-chambered.
Seeds

0.3–0.45 × 0.15–0.25 mm, apiculate.

0.6–1.1 × 0.4–0.6 mm, often silvery, apiculate.
2n

=80.

Juncus interior

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

River shores. 50–200 m. Col. CA, ID, WA; throughout North America. Native.

Damp dunes, sandy shores, coastal fresh-water marshes. 0–50m. Est. CA. Native.

This species is identified by the large flowers typical of J. breweri and the more open inflorescence found in J. balticus. It is possibly derived from hybrids between those two species and often grows with them. It was long thought to be endemic to the San Francisco Bay area (Lint 1977).
Source Flora of Oregon, volume 1, page 279
Peter Zika		 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. 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. 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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