Flora of North America species comparison

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Juncus uncialis

Juncus polycephalus

inch high dwarf rush, inch-high rush, twelfth rush

flatleaf rush, manyhead rush
Habit Herbs, annual, cespitose, 0.8–3.5 cm. Herbs, perennial, cespitose, 6–10 dm.
Culms

to 70, more than 0.2 mm diam..

erect, 3–14 mm diam.
Cataphylls

absent.
Leaves

to 2.2 cm, 1/2–3/4 height of plant.

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

auricles absent;

blade 8–70 cm × 4–8 mm.
Inflorescences

terminal solitary flowers;

bracts subtending inflorescence 1, widely truncate, enwrapping culm, inconspicuous, 0.25–0.9 mm, membranous, apex widely truncate, completely sheathing culm..

panicles of 16–82 heads, 10–30 cm;

primary bract erect;

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

3-merous, : tepals erect to recurved at maturity, greenish or tinged red, 2–4 × 0.6–0.9 mm;

outer and inner series nearly equal, apex acutish;

stamens usually 3, filaments 0.9–1.6 mm, anthers 0.3–0.4 mm, 1/3 length of filaments;

style 0.1–0.3 mm, stigma 0.4–1.3 mm.

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

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

reddish to maroon, 3-locular, ovoid to ellipsoid, 1.8–3.2 × 1–2.5 mm, nearly equal or shorter than the tepals.

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

ovoid, 0.3–0.4 mm.

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

= 16.

Juncus uncialis

Juncus polycephalus
Phenology Flowering and fruiting spring–early summer. Fruiting spring–fall.
Habitat Margins of vernal pools and ponds Wet or seasonally wet shores, depressions, occasionally in fairly deep water of streams, usually with a peaty or mucky substrate, occasionally sandy to gravelly
Elevation 0–1700 m (0–5600 ft) 0–100 m (0–300 ft)
Distribution
from FNA
CA; NV; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; FL; GA; LA; MD; MS; NC; SC; TX
[WildflowerSearch map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Graminifolii 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. 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. 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. 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 Greene: Pittonia 2: 105. (1890) Michaux: Flora Boreali-Americana 1: 192. 1803 (as polycephalos)
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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