Flora of North America species comparison

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Juncus chlorocephalus

Juncus coriaceus

green head rush

leathery rush
Habit Herbs, perennial, cespitose, 2–4.5 dm. Herbs, perennial, tufted, 3–9 dm.
Rhizomes

densely branching.
Culms

erect, terete, 1–3 mm diam., smooth.

few to many.
Cataphylls

1, straw-colored or maroon, apex acute.

1–3.
Leaves

basal 1–2, cauline 2–3;

auricles 2–3.5 mm, apex rounded, scarious;

blade terete, 2–16 cm × 1–2 mm.

basal, 0–1(–2);

auricles 0.2–0.4(–0.6) mm, scarious to leathery;

blade nearly terete but slightly channeled adaxially, 10–50 cm × 0.7–1.8 mm, margins entire..
Inflorescences

single heads (rarely cluster of 2–3 heads), 0.5–2 cm;

primary bract erect;

heads 15–25-flowered, spheric, 11–14 mm diam.

falsely lateral, 5–35-flowered, loose to congested, 1–8 cm;

primary bract exceeding inflorescence.
Flowers

tepals light green to light pink or white, lanceolate, 3.1–4.2 mm, apex obtuse;

stamens 6, anthers 2–3 times filament length.

pedicels 0.5–2.5 mm;

bracteoles 2;

tepals dark green, lanceolate, 3.5–5 mm;

inner series slightly shorter, apex acute;

stamens 6, fewer in cleistogamous flowers, filaments 0.8–1.2 mm, anthers 0.5–1.1 mm;

style 0.9–1.3 mm.
Capsules

included, straw-colored, 1-locular, broadly obovoid to ovoid, 2.2–2.5 mm, apex obtuse, valves separating at dehiscence, fertile throughout or only proximal to middle.

light to dark brown, 1-locular, widely ovoid to nearly globose, 3.5–5 × 2.6–3.2 mm.
Seeds

oblong, 0.5 mm, not tailed;

body clear yellow-brown.

light to dark brown, oblate, 0.55–0.73 mm, not tailed.
2n

= 80.

Juncus chlorocephalus

Juncus coriaceus
Phenology Fruiting mid summer–fall. Flowering and fruiting spring–early summer.
Habitat Sandbars, meadows, damp soil in rock outcrops, and talus Springy, wet woodlands, stream banks, marshy areas, flatwood depressions, and shaded or exposed disturbed, sites with poor drainage
Elevation 1400–3000 m (4600–9800 ft)
Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; DE; FL; GA; KY; LA; MD; MS; NC; NJ; NY; OK; SC; TN; VA; Texas
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Septati Juncaceae > Juncus > subg. Poiophylli
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. 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
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. 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
Name authority Engelmann Mackenzie: Bulletin of the Torrey Botanical Club 56:28. (1929)
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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