Flora of North America species comparison

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Juncus tenuis

Juncus ensifolius var. montanus

(synonym of Juncus saximontanus)

path rush, poverty or slender rush, poverty rush, slender rush

Rocky Mountain rush, Tracy's rush
Habit Herbs, perennial, tufted, 1.5–5 dm.
Rhizomes

densely branching.

Culms

few–20.

Leaves

basal, (1–)2–3;

auricles 2–5 mm, apex acute, membranous;

blade flat, 3–12 cm × 0.5–1 mm, margins entire.

2–25 cdm × 1.5–4 mm.
Inflorescences

5–40-flowered, borne congested or branch internodes ca. as long as tepals, ssomewhat loose, 1–5 cm;

primary bract usually longer than inflorescence.

3–20 heads;

heads obovoid to globose.
Flowers

bracteoles 2;

tepals greenish, lanceolate, 3.3–4.4 mm;

outer and inner series nearly equal;

stamens 6, filaments 0.5–0.9 mm, anthers 0.1–0.2 mm;

style 0.1–0.2 mm.

outer tepals 2.7–3.6 mm;

inner tepals 2.7–3 mm;

stamens 6.
Capsules

tan or light brown, 1-locular to pseudo-3-locular, ellipsoid, (3.3–)3.8–4.7 × (1.1–)1.3–1.7 mm, nearly equal to tepals.

slightly exserted, ellipsoid, 2.4–4.3 mm.
Seeds

tan, ellipsoid to lunate, (0.52–)5.5–0.65(–0.7) mm, not tailed.

0.4–1 mm, tailed or more often not tailed.
2n

= 80.

Juncus tenuis

Juncus ensifolius var. montanus
Phenology Flowering spring–early summer. Fruiting early summer–fall.
Habitat Exposed or shaded sites in soils ranging from sandy to clayey under moist or drier conditions, oftentimes these sites naturally or otherwise disturbed (e.g., game or human trails) Wet meadows, bogs, springy woods, stream and lake shores
Elevation 400–3000 m (1300–9800 ft)
Distribution
from FNA
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NS; ON; PE; QC; SK [Introduced worldwide]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; CO; ID; MT; NM; NV; OR; SD; TX; UT; WA; WY; AB; BC; ; Mexico (s to Puebla, Veracruz)
[WildflowerSearch map]
[BONAP county map]
Discussion

Juncus tenuis occurs throughout North America. It is particularly abundant in northeastern United States and eastern Canada, although infrequent in the south and west.

Through the use of isozyme electrophoresis, hybridization can be demonstrated between various members of the Juncus tenuis complex, including Juncus tenuis, J. anthelatus, J. interior, J. secundus, and J. dichotomus (R. E. Brooks, unpubl.). Juncus ××oronensis is thought to be a hybrid between J. tenuis and J. vaseyi in the northeast.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Poiophylli Juncaceae > Juncus > subg. Ensifolii > Juncus ensifolius
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. 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. texanus, J. textilis, J. tiehmii, J. torreyi, J. trifidus, J. triformis, J. triglumis, J. trigonocarpus, J. uncialis, J. validus, J. vaseyi, J. xiphioides
J. ensifolius var. ensifolius, J. ensifolius var. montanus
Synonyms J. bicornis, J. bicornis var. williamsii, J. macer, J. macer, J. macer var. williamsii, J. tenuis var. bicornis, J. tenuis var. multicornis, J. tenuis var. williamsii J. xiphioides var. montanus, J. brunnescenns, J. ensifolius var. brunnescens, J. parous, J. saximontanus, J. tracyi, J. utahensis, J. xiphioides var. montanus
Name authority Willdenow: Sp. Pl. 2(1): 214. (1799) (Engelmann) C. L. Hitchcock: in C. L. Hitchcock et al., Vascular Plants of the Pacific Northwest 1: 195. (1969)
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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