Flora of North America species comparison

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Juncus gymnocarpus

Juncus hallii

Pennsylvania rush

Hall's rush
Habit Herbs, perennial, 5–10 dm. Herbs, perennial, strongly tufted, to 4 dm.
Rhizomes

widely creeping, 2–4 mm diam.

densely short-branched.
Culms

terete, 1.5–2.5 mm diam.

terete.
Cataphylls

several.

several.
Leaves

blade absent.

auricles 0.2 mm, apex acutish to rounded, scarious;

blade 4–15 cm.
Inflorescences

8–30(–50)-flowered, open, 1.5–4 cm;

primary bract terete, 1–2.5 dm, much longer than inflorescence.

2–7-flowered, loose to congested;

primary bract usually longer than inflorescence.
Flowers

pedicellate;

bracteoles broadly ovate;

tepals light brown, ovate-lanceolate, 1.8–2.5 mm, apex acuminate;

inner series shorter, margins scarious, apex acute;

stamens 6, filaments 1–1.3 mm, anthers 0.5–0.7 mm;

style 0.5 mm.

pedicellate;

bracteoles ovate;

tepals light brown with green midstripe, lanceolate or widely so, 4–5 mm, margins scarious;

inner series loosely subtending capsule at maturity, shorter;

stamens 6, filaments 0.8 mm, anthers 0.8–1.1 mm;

style 0.2 mm.
Capsules

reddish tan to brown, lustrous, 3-locular, widely ellipsoid, 2–3 × 1.8–2.2 mm, exceeding perianth.

brown, 3-locular, oblong-ovoid, 3.5–5 × 1.5–1.9 mm, slightly exceeding perianth.
Seeds

dark amber, obovoid, 0.7–1 mm, not tailed.

amber, body 0.5 mm, tails 0.3 mm.

Juncus gymnocarpus

Juncus hallii
Phenology Flowering and fruiting summer. Flowering and fruiting summer.
Habitat Sphagnous swamps, low woods, edges of lakes Exposed slopes, stream banks, and meadows in montane and alpine areas
Elevation 600–1500 m (2000–4900 ft) 1600–3000 m (5200–9800 ft)
Distribution
from FNA
AL; FL; MS; NC; PA; SC; TN
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; ID; MT; UT; WA; WY
[BONAP county map]
Source FNA vol. 22. FNA vol. 22.
Parent taxa Juncaceae > Juncus > subg. Genuini 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. 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. 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. 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. smithii
Name authority Coville: Memoirs of the Torrey Botanical Club 5: 106. (1894) Engelmann
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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