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green head rush

somewhat-tail rush, woodland rush

Habit Herbs, perennial, cespitose, 2–4.5 dm. Herbs, perennial, cespitose, 1.5–6 dm.
Culms

erect, terete, 1–3 mm diam., smooth.

erect, 1–3 mm diam., smooth.

Cataphylls

1, straw-colored or maroon, apex acute.

0–1, straw-colored, apex acute.

Leaves

basal 1–2, cauline 2–3;

auricles 2–3.5 mm, apex rounded, scarious;

blade terete, 2–16 cm × 1–2 mm.

basal 1, cauline 1–3;

auricles 0.5–1 mm, apex rounded, scarious;

blade terete, 4.5–15 cm × 1–2 mm.

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.

panicles or racemes of 3–35 heads, 2–16 cm, branches widely spreading (at least the proximalmost);

primary bract erect;

heads 2–10(–20)-flowered, obconic to nearly spheric, 3–9 mm diam.

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.

tepals greenish, becoming straw-colored, lanceolate;

outer tepals 1.8–3 mm, apex acuminate;

inner tepals 2–3.2 mm, apex acuminate;

stamens 3, anthers 1/3 filament length.

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.

exserted, straw-colored, imperfectly 3-locular, ovoid to prismatic, 3–3.8 mm, apex acute proximal to beak, valves separating at dehiscence.

Seeds

oblong, 0.5 mm, not tailed;

body clear yellow-brown.

ellipsoid, 0.7–1.2 mm, tailed;

body covered with whitish translucent veil.

Juncus chlorocephalus

Juncus subcaudatus

Phenology Fruiting mid summer–fall. Fruiting late summer–fall.
Habitat Sandbars, meadows, damp soil in rock outcrops, and talus Stream banks, lake and pond shores, bogs, and other wet places
Elevation 1400–3000 m (4600–9800 ft) 0–1000 m (0–3300 ft)
Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CT; DC; DE; GA; IL; KY; MA; MD; ME; MO; NC; NJ; NY; OH; PA; RI; TN; VA; WV; NF; NS
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Septati Juncaceae > Juncus > subg. Septati
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. 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. 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. canadensis var. subcaudatus, J. subcaudatus var. planisepalus
Name authority Engelmann (Engelmann) Coville & S. F. Blake: Proceedings of the Biological Society of Washington 31: 45. (1918)
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