Juncus subtilis

E. Meyer

Syn. Luzul. 31. 1823

Common names: Creeping rush jonc délié
Synonyms: Juncus uliginosus var. subtilis (E. Meyer) Hooker Juncus pelocarpus var. subtilis (E. Meyer) Engelmann Juncus pelocarpus var. fluitans (Michaux) Buchenau
Treatment appears in FNA Volume 22. Treatment on page 245. Mentioned on page 246.
Herbs, perennial, emergent, rhizomatous (forming mats to 5 dm), 0.5–1 dm. Rhizomes 1 mm diam., nodes not swollen. Culms repent, floating or submersed, usually profusely branched, terete, 0.5–1 mm diam. Cataphylls absent. Leaves: basal 1–5, cauline 1–4, small fascicles of short capillary leaves often on rhizomes and stems; auricles 0.1–0.8 mm, apex acute, membranaceous; blade terete, 1.6–3 cm × 0.1–0.3 mm. Inflorescences cymes, flowers 1–3 at 1–2 nodes, 1–4 cm, branches spreading to erect. Flowers: tepals reddish, oblong; outer tepals 1.8–2.8 mm, obtuse; inner tepals 2.2–4.4 mm, obtuse; stamens 6, anthers 3/4 to equal filament length. Capsules exserted, chestnut brown, 1-locular, ovoid to narrowly ovoid, 2.4–5 mm, apex acute proximal to beak, valves separating at dehiscence. Seeds ovoid, 0.3–0.5 mm, not tailed; body clear yellow-brown. 2n = 40.

Phenology: Fruiting late summer–early fall.
Habitat: Muddy, sandy or gravelly shores, fens in decomposed peat, fine muds rich in humus, and submersed in brackish pools
Elevation: 0–200 m

Distribution

V22 230-distribution-map.jpg

Greenland, N.B., Nfld. and Labr., Ont., Que., Maine.

Discussion

Flowers are rarely replaced by bulbils. Most Greenland collections are sterile.

References

None.

Lower Taxa

No lower taxa listed.