Flora of North America species comparison

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Juncus triglumis

Juncus triglumis var. albescens

three-flower rush, three-hulled rush
Photo is of parent taxon

three-flower rush, whitish rush, whitish three-flower rush
Habit Herbs, perennial, cespitose, 0.3–3.5 dm.
Culms

1–8, 0.3–0.5 mm diam.

Cataphylls

1–2.

Leaves

basal, 2–4;

auricles slightly prolonged, rounded, scarious to ± leathery;

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

Inflorescences

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

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

most proximal bracts of infloresecence equal to or longer than inflorescence, apex long acuminate or awned.
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.

Capsules

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

included or barely exserted from perianth, 3–5 mm, apex nearly truncate proximal to persistent style.
Seeds

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

2n

= 132.

Juncus triglumis

Juncus triglumis var. albescens
Phenology Flowering and fruiting summer.
Habitat Peat bogs
Elevation 0–820 m (0–2700 ft)
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]
from FNA
AK; CO; ID; MT; NM; OR; UT; WY; AB; BC; MB; NL; NT; NU; ON; QC; SK; YT; Greenland; e Asia
Discussion

Varieties 3 (2 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
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Alpini Juncaceae > Juncus > subg. Alpini > Juncus triglumis
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
J. triglumis var. triglumis
Subordinate taxa
J. triglumis var. albescens, J. triglumis var. triglumis
Synonyms J. albescens, J. triglumis subsp. albescens
Name authority Linnaeus: Sp. Pl. 1: 328. (1753) Lange: Consp. Fl. Groenland. 1: 123. (1880)
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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