Juncus uncialis |
Juncus compressus |
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inch high dwarf rush, inch-high rush, twelfth rush |
compressed rush, round-fruit rush |
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Habit | Herbs, annual, cespitose, 0.8–3.5 cm. | Herbs, perennial, to 8 dm. |
Rhizomes | short- creeping or densely branching, if densely branching herb appearing cespitose. |
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Culms | to 70, more than 0.2 mm diam.. |
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Cataphylls | 1–3. |
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Leaves | to 2.2 cm, 1/2–3/4 height of plant. |
basal and cauline, 1–2; auricles 0.3–0.5 mm, scarious to membranous; blade flat to slightly channeled, 5–35 cm × 0.8–2 mm, margins entire. |
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.. |
5–60-flowered, lax, loose to moderately congested, 1.5–8 cm; primary bract usually exceeding inflorescence. |
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. |
bracteoles 2; tepals brownish, ovate to oblong, 1.7–2.7 mm; inner and outer series nearly equal, apex obtuse; stamens 6, filaments 0.5–0.7 mm, anthers 0.6–1 mm; style 0.3 mm. |
Capsules | reddish to maroon, 3-locular, ovoid to ellipsoid, 1.8–3.2 × 1–2.5 mm, nearly equal or shorter than the tepals. |
brown or darker, pseudo-3-locular, widely ellipsoid to obovoid, 2.5–3.5 × 1.4–1.8 mm, exceeding tepals. |
Seeds | ovoid, 0.3–0.4 mm. |
light brown, ellipsoid to lunate, 0.35–0.556 mm, not tailed. |
n | = 16. |
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2n | = 44. |
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Juncus uncialis |
Juncus compressus |
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Phenology | Flowering and fruiting spring–early summer. | Flowering and fruiting late spring–early summer. |
Habitat | Margins of vernal pools and ponds | Disturbed ground, especially ditches, along railroads and banks of canals and roadsides, frequently in saline or alkaline soils |
Elevation | 0–1700 m (0–5600 ft) | 1500–2100 m (4900–6900 ft) |
Distribution |
CA; NV; OR
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CO; MD; ME; MI; MN; MT; ND; NE; NY; UT; WI; WY; MB; NF; NS; ON; QC; Europe; w Asia [Introduced in North America]
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Source | FNA vol. 22. | FNA vol. 22. |
Parent taxa | Juncaceae > Juncus > subg. Graminifolii | Juncaceae > Juncus > subg. Poiophylli |
Sibling taxa | ||
Synonyms | J. bulbosus, J. supinus | |
Name authority | Greene: Pittonia 2: 105. (1890) | Jacquin: Enumeratio Stirpium Pleraumque, quae sponte crescung in agro Vindobonensi 60, 235. (1762) |
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