Flora of North America species comparison

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Juncus ensifolius

Juncus exiguus

dagger rush, dagger-leaf rush, sword-leaf rush, three-stamen rush

Klamath or weak rush, Klamath rush, weak rush
Habit Herbs, perennial, rhizomatous, 2–6 dm.
Rhizomes

2–3 mm diam.

Culms

erect, 2–6 mm diam.

Cataphylls

0 or 1–2, straw-colored, apex narrowly acute.

Leaves

basal 1–3, cauline 2–6, straw-colored;

auricles absent;

blade 2–25 cdm x 1.5–6 mm.

Inflorescences

panicles or racemes of 2–50 heads or heads solitary, 2–14 cm, erect or ascending branches;

primary bract erect;

heads 3–70-flowered, obovoid to globose, 7–11 mm diam.

Flowers

tepals green to brown or reddish brown, lanceolate;

outer tepals 2.7–3.6(–4) mm, apex acuminate;

inner tepals 2.2–3(–3.5) mm, nearly equal, apex acuminate;

stamens 3 or 6;

anthers ½1/2 to equal filament length.

Capsules

included to slightly exserted, chestnut to dark brown, 1-locular, oblong, 2.4–4.3 mm, apex obtuse proximal to beak.

Seeds

elliptic to obovate, 0.4–1 mm, occasionally tailed.

Juncus ensifolius

Juncus exiguus
Distribution
from FNA
AK; AZ; CA; CO; ID; MT; NM; NV; NY; OR; SD; TX; UT; WA; WI; WY; AB; BC; ON; QC; SK [Introduced in Europe and East Asia]
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stamens 3
var. ensifolius
1. Stamens 6
var. montanus
Source FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Ensifolii
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. 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. 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. 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. 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
Subordinate taxa
J. ensifolius var. ensifolius, J. ensifolius var. montanus
Name authority Wikstrom: Kongl. Vetenskaps Academiens Handlingar 2: 274. (1823)
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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