Flora of North America species comparison

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Juncus oxymeris

Juncus biglumis

point rush

two-flower rush, two-glumed rush
Habit Herbs, perennial, rhizomatous, 3–6 dm. Herbs, perennial, loosely cespitose, 0.25–1.6 dm.
Rhizomes

1–2 mm diam.

Culms

erect, 2–4 mm diam.

nearly terete.
Cataphylls

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

2–4.
Leaves

basal 1–3, cauline 3–4, straw-colored;

auricles absent;

blade 3–20 cm × 3–7 mm.

basal, 1–4;

sheaths loose;

auricles absent or rounded, 0.5 mm;

blade imperfectly septate, ascending, nearly terete, 2–7 cm × 0.5–1.5 mm.
Inflorescences

panicles of 10–50 heads, 6–20 cm, erect to ascending branches;

primary bract erect;

heads 3–11-flowered, turbinate to hemispheric, 4–8 mm diam.

heads, 1–2(–4)-flowered;

primary bracts much longer than inflorescence.
Flowers

tepals straw-colored, lanceolate, 2.5–3.2 mm, nearly equal, apex acute to narrowly acuminate, mucronate;

stamens 6, anthers 0.5–1.5 times length of filaments.

tepals brown to blackish, oblong, 2.5–4 mm, apex obtuse;

outer and inner series nearly equal;

stamens 6, filaments 1–1.5 mm, anthers 0.5–0.7 mm;

style deciduous, 0.3–0.4 mm.
Capsules

exserted, chestnut brown, 1-locular, broadly lanceoloid to narrowly oblong, 3.3–4.7 mm, apex tapering to beak, separating at dehiscence.

pale with dark purplish valve margins, pseudo-3-locular, oblate to narrowly ovoid, 4–5.5 × 1.7–2.3 mm, exceeding perianth, apex retuse.
Seeds

obovoid, 0.5 mm, not tailed.

yellowish tan, fusiform-ovoid, 0.7–0.9 mm, short tailed.
2n

= 120.

Juncus oxymeris

Juncus biglumis
Phenology Fruiting late spring–fall. Flowering and fruiting summer.
Habitat Stream and lake shores, montane meadows and seasonally emergent wetlands Wet tundra and mossy margins of ponds and streams, wet gravel and open, rocky slopes in alpine zones
Elevation 100–2000 m (300–6600 ft) 10–3400 m (0–11200 ft)
Distribution
from FNA
CA; OR; WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CO; MT; WY; AB; BC; LB; MB; NT; NU; ON; QC; YT; Greenland; n Europe; Asia
[BONAP county map]
Discussion

Juncus oxymeris should be expected in Mexico (Baja California).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Ensifolii Juncaceae > Juncus > subg. Alpini
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. 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. 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
Synonyms J. acutiflorus
Name authority Engelmann Linnaeus: Sp. Pl. 1: 328. (1753)
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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