Juncus polycephalus

Michaux

Flora Boreali-Americana 1: 192. 1803 (as polycephalos).

Endemic
Synonyms: Juncus echinatus Muhlenberg Juncus engelmannii Buchenau
Treatment appears in FNA Volume 22.

Herbs, perennial, cespitose, 6–10 dm. Culms erect, 3–14 mm diam. Cataphylls absent. Leaves: basal 2–3 (–6), cauline 1–4, brownish green; auricles absent; blade 8–70 cm × 4–8 mm. Inflorescences panicles of 16–82 heads, 10–30 cm; primary bract erect; heads 20–30-flowered, spheric, 8–12 mm diam. Flowers: tepals green to reddish, lance-subulate, 3–4 mm, nearly equal, apex acuminate; stamens 3, anthers 1/3–1/2 length of filaments. Capsules exserted, straw-colored, 1-locular, narrowly ovoid, 4–5 mm, apex tapering to beak, remaining after dehiscence. Seeds lance-ellipsoid, 0.5–0.6 mm, not tailed.


Phenology: Fruiting spring–fall.
Habitat: Wet or seasonally wet shores, depressions, occasionally in fairly deep water of streams, usually with a peaty or mucky substrate, occasionally sandy to gravelly
Elevation: 0–100 m

Distribution

V22 513-distribution-map.jpg

Ala., Fla., Ga., La., Md., Miss., N.C., S.C., Tex.

Discussion

Selected References

None.

Lower Taxa

None.

"/3lengthoffilaments" is not declared as a valid unit of measurement for this property. "/2lengthoffilaments" is not declared as a valid unit of measurement for this property.

... more about "Juncus polycephalus"
persistent +
separating +
tapering +  and acuminate +
Ralph E. Brooks* +  and Steven E. Clemants* +
Michaux +
Juncus sect. Ensifolii +
8 cm80 mm <br />0.08 m <br /> (70 cm700 mm <br />0.7 m <br />) +
ensiform +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
straw-colored +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
flattened +
Ala. +, Fla. +, Ga. +, La. +, Md. +, Miss. +, N.C. +, S.C. +  and Tex. +
0–100 m +
arranged +  and cluster +
headlike +
Wet or seasonally wet shores, depressions, occasionally in fairly deep water of streams, usually with a peaty or mucky substrate, occasionally sandy to gravelly +
20-30-flowered +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
spheric +
pseudoaxillary +  and terminal +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
cauline +  and basal +
3 +  and 1 +
green;brown or purplish black +
persistent +
Fruiting spring–fall. +
parietal +  and axile +
Flora Boreali-Americana +
not tailed;lance-ellipsoid +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
green;brown or purplish black +
persistent +
generally longer +
Juncus echinatus +  and Juncus engelmannii +
Juncus polycephalus +
Juncus subg. Ensifolii +
species +
green +  and reddish +
lance-subulate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
herb +  and cespitose +