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diffuse rush, slim-fruit rush, slim-pod rush

thread rush

Habit Herbs, perennial, cespitose, 2.5–6.5 dm. Herbs, perennial, 0.2–3.5 dm.
Rhizomes

widely creeping, sparingly branched, 1.5–2 mm diam., nodes closely set.

Culms

erect, terete, 1–3 mm diam., smooth.

terete, 1 mm diam.

Cataphylls

0–1, maroon or dark green, apex obtuse.

several.

Leaves

basal 1, cauline 2–3;

auricles 1–2.1 mm, apex rounded, membranaceous;

blade maroon or dark green, terete to compressed, 3–20 cm × 1–2.4 mm.

blade absent.

Inflorescences

terminal panicles of 30–70(–130), 5–20 cm, branches spreading;

primary bract erect;

;

heads (1–)2–10-flowered, hemispheric or narrower, 5–10 mm diam.

3–10(–12)-flowered, loosely congested, 1–2 cm;

primary bract terete, nearly equaling to much longer than culm.

Flowers

tepals green to straw-colored, lanceolate, apex acute;

outer tepals (2–)2.6–3.2 mm;

inner tepals (1.8–)2.3–3 mm;

stamens 3, anthers 1/2–2/3 filament length.

pedicellate;

bracteoles broadly ovate, tepals light brown or green, lanceolate, 2.5–4.2 mm;

inner series loosely subtending capsule at maturity, slightly shorter, margins scarious;

stamens 6, filaments 0.5–0.9 mm, anthers 0.5–0.7 mm;

style 0.2 mm.

Capsules

exserted, , straw-colored, 1-locular, linear-lanceoloid, 4–5.2 mm, apex acute, valves separating at dehiscence.

tan, 3-locular, nearly globose, 2.5–3 × 1.8–2.1 mm, shorter than perianth.

Seeds

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

body clear yellow-brown.

amber, 0.5–0.6 mm, not tailed.

2n

= 40, 70, 80, 84.

Juncus diffusissimus

Juncus filiformis

Phenology Fruiting summer. Flowering and fruiting summer.
Habitat In soft mucky substrates, marshy shores, sloughs, occasionally in wet wooded places, often in shallow water, commonly abundantly colonizing wet, sandy- alluvial outwash in ditches and clearings Usually sandy, moist or wet soil along stream banks, pools, lakes or in meadow depressions, rarely in bogs, frequently hidden by larger vegetation
Elevation 10–1000 m (0–3300 ft) 0–3000 m (0–9800 ft)
Distribution
from FNA
AL; AR; CA; CT; FL; GA; IL; IN; KS; KY; LA; MD; MO; MS; NC; OH; OK; SC; TN; TX; VA; WA; WV [Probably introduced, South America]
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CO; ID; MA; ME; MI; MN; MT; NE; NH; NJ; NY; OR; PA; UT; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; SPM; Greenland; Eurasia; Atlantic Islands (Iceland)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Septati Juncaceae > Juncus > subg. Genuini
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. 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. 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 Buckley: Proceedings of the Academy of Natural Sciences of Philadelphia 14: 9. (1862) Linnaeus: Sp. Pl. 1: 326. (1753)
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