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

Nevada rush, Tiehm's dwarf rush, Tiehm's rush

Habit Herbs, perennial, cespitose, 2.5–6.5 dm. Herbs, annual, cespitose, 0.1–0.6 dm.
Culms

erect, terete, 1–3 mm diam., smooth.

to 150, 0.1–0.2 mm diam.

Cataphylls

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

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.

to 2.5 cm × 0.1–0.3 mm.

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.

headlike clusters, each with 1–4(–7) flowers;

bracts subtending inflorescence 2–4(–8), ovate, inconspicuous, 0.6–1.5 mm, membranous, apex acute.

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.

3-merous;

: tepals 4(–6), green or darker, acute to acuminate, 1.9–2.9 × 0.4–0.6 mm, nearly equal;

stamens 2(–3), filaments 0.5–0.8 mm, anthers 0.3–0.4 mm;

style 0.2–0.3 mm, stigma 0.2–0.7 mm.

Capsules

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

pink-tinged, 2- or 3-locular, ellipsoid to narrowly oblate, 1.9–2.9 × 1.1–1.5 mm, nearly equal or slightly longer than tepals.

Seeds

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

body clear yellow-brown.

oblate to ovoid, 0.35–0.55 mm.

n

= 17.

Juncus diffusissimus

Juncus tiehmii

Phenology Fruiting summer. Flowering and fruiting mid spring–early fall.
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 Bare, moist granitic sand along streams, seepage areas around outcrops, and depressions in meadows
Elevation 10–1000 m (0–3300 ft) 300–3100 m (1000–10200 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
CA; ID; NV; WA; Mexico
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Septati Juncaceae > Juncus > subg. Graminifolii
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. 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. 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) Ertter: Memoirs of the New York Botanical Garden 39: 60, figs. 13f–g, 14. (1986)
Web links