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capitate rush, dwarf rush, leafy-bract dwarf rush

knotty-leaf rush, sharp-fruit rush, tapered rush, tapertip rush

Habit Herbs, annual, cespitose, 0.3–1 dm. Herbs, perennial, cespitose, not rhizomatous, 1.4–10 dm.
Culms

to 20.

erect, terete, 1–3 mm diam., smooth.

Cataphylls

1–2, gray, apex acute.

Leaves

basal;

auricles absent;

blade 0.5–2.5 cm × 0.5 mm.

basal 1–2, cauline 1–2;

auricles 1–1.5 mm, apex rounded, scarious;

blade green, straw-colored, or pink, nearly terete, 1–40 cm.

Inflorescences

glomerules 1–2, each with 2–10(–14) flowers;

bracts subtending inflorescence 1(–2), foliose, clearly surpassing inflorescence.

terminal panicles of 5–50 heads, 5–15 cm, branches ascending;

primary bract erect;

heads (2–)5–20(–50)-flowered, hemispheric (to spheric), 3–10 mm diam.

Flowers

tepals 6, tan to brownish, subulate, lanceolate-ovate, 3.5–4.5(–5) mm, 2 times length of inner tepals, margins scarious;

inner series delicate, shorter, apex acute;

stamens 3, filaments 1 mm, anthers 0.5 mm;

style 0.4–0.7 mm.

tepals light brown to greenish, lanceolate, 2.6–3.5(–3.9) mm, apex acuminate;

stamens 3 (or 6), anthers 1/3 filament length.

Capsules

tan to reddish brown, 3-locular, globose to obovoid, 1.2–1.7 mm, shorter than tepals.

equaling perianth or slightly exserted, straw-colored, 1-locular, ellipsoid to narrowly ovoid, 2.8–3.5(–4) mm, apex acute, valves separating at dehiscence, fertile throughout or only proximal to middle.

Seeds

ellipsoid-ovoid, 0.3–0.4 mm.

ellipsoid to oblong, 0.3–0.4 mm, not tailed;

body clear yellow-brown.

2n

= 18.

= 40.

Juncus capitatus

Juncus acuminatus

Phenology Flowering and fruiting spring. Fruiting early summer–fall.
Habitat Moist to wet areas, usually in sandy, often disturbed soil such as roadsides or along trails Shores, swamps, ditches, springs, wet meadows, and rock outcrops
Elevation below 1000 m (below 3300 ft) 0–2200 m (0–7200 ft)
Distribution
from FNA
CA; LA; OK; TX; native; Africa (north); Europe; Asia (Near East) [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; VT; WA; WI; WV; BC; NS; ON; QC; Mexico; Central America (Honduras)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Graminifolii 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. 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
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. uncialis, J. validus, J. vaseyi, J. xiphioides
Synonyms J. acuminatus var. legitimus, J. pallescens, J. pondii
Name authority Weigel: Observ. Bot. 28. (1772) Michaux: Flora Boreali-Americana 1: 192. (1803)
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