Flora of North America species comparison

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Juncus polycephalus

Juncus longistylis

flatleaf rush, manyhead rush

long-style rush
Habit Herbs, perennial, cespitose, 6–10 dm. Herbs, perennial, 2–6 dm.
Rhizomes

long creeping.
Culms

erect, 3–14 mm diam.

slightly compressed.
Cataphylls

absent.

Leaves

basal 2–3(–6), cauline 1–4, brownish green;

auricles absent;

blade 8–70 cm × 4–8 mm.

basal 2–5, cauline 1–3;

auricles 1–2.5 mm, apex truncate to obtuse;

blade flat, 1–3 dm × 1.5–3 mm, the cauline shorter.
Inflorescences

panicles of 16–82 heads, 10–30 cm;

primary bract erect;

heads 20–30-flowered, spheric, 8–12 mm diam.

glomerules 1–4(–8), each with 3–12 flowers, open or aggregate, 2–6(–10) cm;

primary bract shorter than inflorescence.
Flowers

tepals green to reddish, lance-subulate, 3–4 mm, nearly equal, apex acuminate;

stamens 3, anthers 1/3–1/2 length of filaments.

tepals brown with green midstripe, lanceolate, 5–6 mm, margins scarious, sometimes papillose;

outer series slightly shorter;

stamens 6, filaments 0.5–1 mm, anthers 1.2–2 mm;

style 0.6 mm.
Capsules

exserted, straw-colored, 1-locular, narrowly ovoid, 4–5 mm, apex tapering to beak, remaining after dehiscence.

tan, 3-locular, obovoid, 3–5 mm, shorter than perianth.
Seeds

lance-ellipsoid, 0.5–0.6 mm, not tailed.

ovoid, 0.4–0.6 mm, not tailed.
2n

= 40.

Juncus polycephalus

Juncus longistylis
Phenology Fruiting spring–fall. Flowering and fruiting summer.
Habitat Wet or seasonally wet shores, depressions, occasionally in fairly deep water of streams, usually with a peaty or mucky substrate, occasionally sandy to gravelly Moist ground in mountain meadows
Elevation 0–100 m (0–300 ft) 1000–3300 m (3300–10800 ft)
Distribution
from FNA
AL; FL; GA; LA; MD; MS; NC; SC; TX
[WildflowerSearch map]
from FNA
AZ; CA; CO; ID; MI; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; NF; ON; QC; SK
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Ensifolii Juncaceae > Juncus > subg. Graminifolii
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. 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. 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. echinatus, J. engelmannii
Name authority Michaux: Flora Boreali-Americana 1: 192. 1803 (as polycephalos) Torrey: in W. H. Emory, Report on the United States and Mexican Boundary Survey, ... 2(1): 223. (1859)
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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