Flora of North America species comparison

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Juncus triglumis

Juncus subg. Alpini

three-flower rush, three-hulled rush
Habit Herbs, perennial, cespitose, 0.3–3.5 dm. Herbs, perennial, rhizomatous, usually fresh-water habitats.
Culms

1–8, 0.3–0.5 mm diam.

Stems

terete.
Cataphylls

1–2.

Leaves

basal, 2–4;

auricles slightly prolonged, rounded, scarious to ± leathery;

blade deeply channeled, 2–10 cm, mostly shorter than culms.

basal or cauline;

blade terete, channeled, imperfectly septate or not.
Inflorescences

solitary heads, each with 2–3(–50) flowers;

primary bracts brownish, nearly equal to or slightly shorter thanabout equaling inflorescence.

terminal panicles or racemes of several heads or a single terminal head, sympodial or monopodial;

bracteoles absent at base of perianth.
Flowers

tepals pale brown or darker, oblong-lanceolate, 3–5 mm, outer and inner series nearly equal;

stamens 6, filaments 2.5–4 mm, anthers 0.6–1 mm;

styles 0.5–0.8 mm.

in multiflowered heads.
Capsules

tan, pseudo-3-locular, 3-gonous–cylindric, apex obtuse, mucronate.

(1–)3-locular.
Seeds

tan or darker, fusiform, body 0.5–1 mm, tails 0.6–1 mm.

long tailed, large.

Juncus triglumis

Juncus subg. Alpini
Distribution
from FNA
AK; CO; ID; MT; NM; OR; UT; WY; AB; BC; MB; NT; NU; ON; QC; SK; YT; Eurasia
[WildflowerSearch map]
[BONAP county map]
n North America; n Europe; n Asia
Discussion

Varieties 3 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species 724 (4 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Most proximal bracts of inflorescence obtuse to mucronate, usually much shorter than inflorescence; capsules well exserted from perianth, 4.5–7 mm, apex conic or rounded proximal to persistent style
var. triglumis
1. Most proximal bracts of infloresecence equal to or longer than inflorescence, apex long acuminate or awned; capsules included or barely exserted from perianth, 3–5 mm, apex nearly truncate proximal to persistent style
var. albescens
1. Plants strongly rhizomatous
J. castaneus
1. Plants cespitose, rhizomes (if present) short, sparingly branched.
→ 2
2. Leaves basal and cauline
J. stygius var. americanus
2. Leaves all basal.
→ 3
3. Primary bract of infloresence much longer than inflorescence
J. biglumis
3. Primary bract of inflorescence nearly equal to or shorter than inflorescence
J. triglumis
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Alpini Juncaceae > Juncus
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. tenuis, J. texanus, J. textilis, J. tiehmii, J. torreyi, J. trifidus, J. triformis, J. trigonocarpus, J. uncialis, J. validus, J. vaseyi, J. xiphioides
Subordinate taxa
J. triglumis var. albescens, J. triglumis var. triglumis
J. biglumis, J. castaneus, J. stygius var. americanus, J. triglumis
Synonyms J. unranked aAlpini, J. section Alpini
Name authority Linnaeus: Sp. Pl. 1: 328. (1753) BUCHENAU(Engelmann) Buchenau: Botanische Jahrbucher fur Systematik, Pflanzengeschichte und Pflanzengeographie 17: 1618. (1886)
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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