Flora of North America species comparison

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Juncus parryi

Juncus occidentalis

Parry rush, Parry's rush

prairie rush, slender juncus, western rush
Habit Herbs, perennial, strongly tufted, 0.5–3 dm. Herbs, perennial, cespitose, 3–6 dm.
Rhizomes

densely short-branched.

densely branching.
Culms

terete.

few–20.
Cataphylls

several.

Leaves

auricles 0.2–0.3 mm, apex acute to rounded, scarious.

basal, (1–)2–3;

auricles 0.5–1(–1.5) mm, apex acutish, membranous;

blade flat, 5–15 cm × 0.5–1.3 mm, margins entire.
Inflorescences

1–3-flowered, open;

primary bract terete, 2–4 cm, usually longer than inflorescence.

5–50-flowered, somewhat loose, 1–7 cm;

primary bract usually longer than inflorescence.
Flowers

pedicellate;

bracteoles broadly ovate;

tepals light brown with green midstripe, lanceolate, 5.5–9 mm, margins scarious;

inner series loosely subtending capsule at maturity, shorter;

stamens 6, filaments 0.7–1 mm, anthers 1.1–1.6 mm;

style 0.2 mm.

bracteoles 2;

tepals greenish, lanceolate, (3.5–)5 mm;

outer and inner series nearly equal;

stamens 6, filaments 0.5–1 mm, anthers 0.1–0.3 mm;

style 0.1–0.2 mm.
Capsules

tan, 3-locular, narrowly oblong, 6–9 × 1.5–2 mm, usually exceeding perianth.

light brown, 1-locular to pseudo-3-locular, ellipsoid, (3–)5–4.5 × 1.2–1.8 mm, nearly equal to shorter than tepals.
Seeds

amber, body 0.6 mm, tails 0.4 mm.

tan, ellipsoid to lunate, 5.5–0.7 mm, not tailed.
2n

= 80.

Juncus parryi

Juncus occidentalis
Phenology Flowering and fruiting summer. Flowering spring–early summer.
Habitat Exposed rocky slopes and stream banks in montane and alpine areas, conifer forests Moist, usually exposed sites in clayey or sandy soil around springs, along rivers and streams, and around lakes
Elevation 1500–4000 m (4900–13100 ft) below 2300 m (below 7500 ft)
Distribution
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; ID; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Juncus occidentalis should perhaps be considered a robust variant of J. tenuis.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Genuini Juncaceae > Juncus > subg. Poiophylli
Sibling taxa
J. acuminatus, J. acutiflorus, J. acutus, J. alpinoarticulatus, J. anthelatus, J. arcticus, J. articulatus, J. biglumis, J. bolanderi, J. brachycarpus, J. brachycephalus, J. brachyphyllus, J. brevicaudatus, J. bryoides, J. bufonius, J. bulbosus, J. caesariensis, J. canadensis, J. capillaris, J. capitatus, J. castaneus, J. chlorocephalus, J. compressus, J. confusus, J. cooperi, J. coriaceus, J. covillei, J. debilis, J. dichotomus, J. diffusissimus, J. drummondii, J. dubius, J. dudleyi, J. effusus, J. elliottii, J. ensifolius, J. falcatus, J. filiformis, J. filipendulus, J. georgianus, J. gerardii, J. greenei, J. gymnocarpus, J. hallii, J. hemiendytus, J. howellii, J. inflexus, J. interior, J. kelloggii, J. leiospermus, J. lesueurii, J. longistylis, J. luciensis, J. macrandrus, J. macrophyllus, J. marginatus, J. maritimus, J. megacephalus, J. mertensianus, J. militaris, J. nevadensis, J. nodatus, J. nodosus, J. occidentalis, J. orthophyllus, J. oxymeris, J. patens, J. pelocarpus, J. pervetus, J. phaeocephalus, J. polycephalus, J. regelii, J. repens, J. roemerianus, J. scirpoides, J. secundus, J. squarrosus, J. stygius, J. subcaudatus, J. subtilis, J. supiniformis, J. tenuis, J. texanus, J. textilis, J. tiehmii, J. torreyi, J. trifidus, J. triformis, J. triglumis, J. trigonocarpus, J. uncialis, J. validus, J. vaseyi, J. xiphioides
J. acuminatus, J. acutiflorus, J. acutus, J. alpinoarticulatus, J. anthelatus, J. arcticus, J. articulatus, J. biglumis, J. bolanderi, J. brachycarpus, J. brachycephalus, J. brachyphyllus, J. brevicaudatus, J. bryoides, J. bufonius, J. bulbosus, J. caesariensis, J. canadensis, J. capillaris, J. capitatus, J. castaneus, J. chlorocephalus, J. compressus, J. confusus, J. cooperi, J. coriaceus, J. covillei, J. debilis, J. dichotomus, J. diffusissimus, J. drummondii, J. dubius, J. dudleyi, J. effusus, J. elliottii, J. ensifolius, J. falcatus, J. filiformis, J. filipendulus, J. georgianus, J. gerardii, J. greenei, J. gymnocarpus, J. hallii, J. hemiendytus, J. howellii, J. inflexus, J. interior, J. kelloggii, J. leiospermus, J. lesueurii, J. longistylis, J. luciensis, J. macrandrus, J. macrophyllus, J. marginatus, J. maritimus, J. megacephalus, J. mertensianus, J. militaris, J. nevadensis, J. nodatus, J. nodosus, J. orthophyllus, J. oxymeris, J. parryi, J. patens, J. pelocarpus, J. pervetus, J. phaeocephalus, J. polycephalus, J. regelii, J. repens, J. roemerianus, J. scirpoides, J. secundus, J. squarrosus, J. stygius, J. subcaudatus, J. subtilis, J. supiniformis, J. tenuis, J. texanus, J. textilis, J. tiehmii, J. torreyi, J. trifidus, J. triformis, J. triglumis, J. trigonocarpus, J. uncialis, J. validus, J. vaseyi, J. xiphioides
Synonyms J. drummondii var. parryi J. tenuis var. occidentalis, J. tenuis var. congestus
Name authority Engelmann (Coville) Wiegand: Bulletin of the Torrey Botanical Club 27: 521. (1900)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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