Juncus uncialis |
Juncus supiniformis |
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inch high dwarf rush, inch-high rush, twelfth rush |
hair-leaf rush, hairy-leaf rush, spreading rush |
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Habit | Herbs, annual, cespitose, 0.8–3.5 cm. | Herbs, perennial, cespitose or matted, often decumbent, rooting at proximal nodes or floating, 0.3–5 dm. |
Culms | to 70, more than 0.2 mm diam.. |
erect, decumbent and rooting at nodes, or floating, terete, 1–2 mm diam., smooth. |
Cataphylls | 0 or 1–2, straw-colored, apex acute. |
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Leaves | to 2.2 cm, 1/2–3/4 height of plant. |
basal 1–3, cauline 1–4; auricles 0.8–2.1 mm, apex rounded to acute, membranaceous; blade terete, 3.7–15 cm × 0.4–1.3 mm, occasionally with filiform, flaccid, and floating leaves to 60 cm. |
Inflorescences | terminal solitary flowers; bracts subtending inflorescence 1, widely truncate, enwrapping culm, inconspicuous, 0.25–0.9 mm, membranous, apex widely truncate, completely sheathing culm.. |
terminal racemes of 2–9 heads, 2–10 cm, branches erect; primary bract erect; heads 2–12-flowered, obconic or rarely hemispheric, 4–13 mm diam. |
Flowers | 3-merous, : tepals erect to recurved at maturity, greenish or tinged red, 2–4 × 0.6–0.9 mm; outer and inner series nearly equal, apex acutish; stamens usually 3, filaments 0.9–1.6 mm, anthers 0.3–0.4 mm, 1/3 length of filaments; style 0.1–0.3 mm, stigma 0.4–1.3 mm. |
tepals light brown or greenish to reddish brown, linear to narrowly lanceolate, apex acute to acuminate-subulate; outer tepals (2.1–)2.8–4.9 mm; inner tepals (2.1–)2.8–5.5 mm; stamens 3 or 6, anthers 1/2–3/4 filament length. |
Capsules | reddish to maroon, 3-locular, ovoid to ellipsoid, 1.8–3.2 × 1–2.5 mm, nearly equal or shorter than the tepals. |
usually exserted, dark brown, 1-locular, ovoid to oblong, (3.2–)3.5–6.1 mm, apex acute to acuminate proximal to beak, valves separating at dehiscence. |
Seeds | ovoid, 0.3–0.4 mm. |
narrowly obovoid to obovoid, 0.6–0.7 mm, not tailed; body clear yellow-brown.. |
n | = 16. |
= ca. 30, ca. 50–60, 2n = ca. 112. |
Juncus uncialis |
Juncus supiniformis |
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Phenology | Flowering and fruiting spring–early summer. | Fruiting mid summer–fall. |
Habitat | Margins of vernal pools and ponds | Pond, lake and river shores, marshes, bogs, and ditches |
Elevation | 0–1700 m (0–5600 ft) | 0–1000 m (0–3300 ft) |
Distribution |
CA; NV; OR
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AK; CA; OR; WA; BC
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Discussion | The northern California and southern Oregon populations (Juncus supiniformis in the strict sense) form long filiform leaves before flowering, are shorter, and have smaller flowers than the northern populations. Except for the filiform leaves, the variation in sizes appears to follow a rough latitudinal cline with the largest plants and largest flowers in Alaska. Flowers of Juncus supiniformis often form bulbils. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Graminifolii | Juncaceae > Juncus > subg. Septati |
Sibling taxa | ||
Synonyms | J. oreganus, J. paucicapitatus | |
Name authority | Greene: Pittonia 2: 105. (1890) | Engelmann |
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