|
|
|
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 |
|
|
|
| Related Links (opens in a new window) |
|
Other Databases
|
|
|
|
|
|
|
|
|
