Difference between revisions of "Juncus subg. Ensifolii"
Bot. Not. 131: 187. 1978.
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|subgenus=Juncus subg. Ensifolii | |subgenus=Juncus subg. Ensifolii | ||
Revision as of 21:21, 27 May 2020
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.
Distribution
w North America, Mexico, e Asia (s to Japan).
Discussion
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.
Species ca. 7 (6 in the flora).
Selected References
None.
Lower Taxa
Key
| 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 |
| 1 | Capsules lanceolate to subulate, tapering to beak, 3.3–5.6 mm (including beak); style usually more than 1 mm. | > 3 |
| 2 | Plants robust, usually more than 6 dm; leaves 7–12 mm wide (rarely to 3 mm wide): capsules acuminate, without beak; stamens 6 | Juncus xiphioides |
| 2 | Plants not robust, 2–5 dm; leaves 1.5–6 mm wide; capsules obtuse proximal to beak; stamens 3 or 6 | Juncus ensifolius |
| 3 | Body of capsule included, beak may be slightly exserted. | > 4 |
| 3 | Body of capsule exserted. | > 5 |
| 4 | Capsules rounded proximal to beak; tepals 3–4 mm; inflorescences with 10 or more 6–12-flowered heads | Juncus macrandrus |
| 4 | Capsules acute proximal to beak; tepals 3.3–4.8 mm; inflorescences variable | Juncus phaeocephalus |
| 5 | Heads spheric, 20–30-flowered; capsules narrowly lanceolate, apex remaining united after dehiscence | Juncus polycephalus |
| 5 | Heads hemispheric or narrower, 3–11-flowered; capsules broadly lanceolate, apex usually separating at dehiscence | Juncus oxymeris |