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FNA | Family List | FNA Vol. 22 | Juncaceae

1d. Juncus subg. Ensifolii (Snogerup) Snogerup, Bot. Not. 131: 187. 1978.

Juncus Linnaeus sect. Ensifolii Snogerup, Bot. Not. 116: 151. 1963

Herbs, perennial, rhizomatous rhizomatous, orsometimes cespitose. Culms flattened, 2-edged, smooth. Leaves basal and cauline; blade ensiform (flattened with 1 edge facing culm), imperfectly septate. Inflorescences terminal panicles of 2--many heads, sympodial; bracteoles absent proximal to perianth. Flowers in multiflowered heads. Capsules 1-locular, apex separating at dehiscence. Seeds not tailed or occasionally tailed, tegmen reticulate and usually lined. 2n = 20.

Species ca. 7 (6 in the flora): w North America, Mexico, e Asia (s to Japan).

Juncus subg. Ensifolii may be polyphyletic. Juncus polycephalus shows affinities with J. scirpoides, J. megacephalus, and J. validus; the remaining members show affinities with J. nevadensis, J. megacephalus, and J. dubius.

1 Capsules cylindric to ovoid, acute to obtuse proximal to beak, 2.7--3.8 mm (including beak): style usually less than 1 mm.   (2)
+ Capsules lanceolate to subulate, tapering to beak, 3.3--5.6 mm (including beak); style usually more than 1 mm.   (3)
2 (1) Plants robust, usually more than 6 dm; leaves 7--12 mm wide (rarely to 3 mm wide): capsules acuminate, without beak; stamens 6   54 Juncus xiphioides
+ Plants not robust, 2--5 dm; leaves 1.5--6 mm wide; capsules obtuse proximal to beak; stamens 3 or 6   55 Juncus ensifolius
3 (1) Body of capsule included, beak may be slightly exserted.   (4)
+ Body of capsule exserted.   (5)
4 (3) Capsules rounded proximal to beak; tepals 3--4 mm; inflorescences with 10 or more 6--12-flowered heads   51 Juncus macrandrus
+ Capsules acute proximal to beak; tepals 3.3--4.8 mm; inflorescences variable   50 Juncus phaeocephalus
5 (3) Heads spheric, 20--30-flowered; capsules narrowly lanceolate, apex remaining united after dehiscence   52 Juncus polycephalus
+ Heads hemispheric or narrower, 3--11-flowered; capsules broadly lanceolate, apex usually separating at dehiscence   53 Juncus oxymeris


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