Juncus covillei |
Juncus dichotomus |
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Coville's rush |
dichotomous rush, fork rush |
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Habit | Herbs, perennial, strongly rhizomatous, 0.5–2.5 dm. | Herbs, perennial, to 10 dm. | ||||
Rhizomes | densely branched to short- creeping. |
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Culms | erect, slightly flattened. |
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Cataphylls | 1–3. |
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Leaves | basal 2–5, cauline 2–4; auricles absent or, if present, 0.5–1.5 mm, apex acute; blade flat, 5–15 cm × 2–3 mm. |
basal, (1-)2-3; auricles 0.2-0.5(-0.6) mm, scarious to leathery; blade nearly terete, channeled or flat, 10-25(-40) cm × (0.5-)0.7-1(-1.2) mm, margins entire. |
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Inflorescences | glomerules, 1–6, each with 3–7 flowers, open to aggregate, 2–6 cm; primary bract or distal leaves usually exceeding inflorescences. |
terminal, (5–)10–85(–100)-flowered, congested to somewhat loose, (1-)2.5-10(-13) cm; primary bract usually exceeding inflorescence. |
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Flowers | tepals usually brown, ovate-oblong, 3–4 mm, margins scarious; inner series slightly shorter, minutely papillate; stamens 6, filaments 0.8–1.4 mm, anthers 0.8–1.4 mm; style 1 mm. |
bracteoles 2; tepals green, lanceolate, (3-)3.3-4.5(-5.5) mm; outer and inner series nearly equal; stamens 6, filaments 0.6–1.2 mm, anthers 0.4-0.8(-1) mm; style 0.2 mm. |
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Capsules | 3-locular, narrowly ovoid, 4–5 mm. |
tan to brown, 1-locular to pseudo-3-locular, ellipsoid to widely so, (2.5-)2.8-3.5(-4.5) × 1x 1.6-2.2 mm. |
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Seeds | narrowly ovoid, 0.3 mm, not tailed. |
brownish to amber, ellipsoid to lunate, 0.3-0.4 mm, not tailed. |
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2n | = ca. 80. |
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Juncus covillei |
Juncus dichotomus |
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Phenology | Flowering and fruiting late spring–summer. | |||||
Habitat | Ditches, shores, clearings, and other typically open areas, usually in sandy, well-drained (but frequently wet) soil | |||||
Distribution |
CA; ID; MT; OR; WA; BC; Coastal to montane areas
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AL; AR; CO; CT; DC; DE; FL; GA; KY; LA; MA; MD; MS; NC; NJ; NY; OH; PA; RI; SC; TN; VA; WV; Mexico; Central America; South America; Texas
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 22. | FNA vol. 22. | ||||
Parent taxa | Juncaceae > Juncus > subg. Graminifolii | Juncaceae > Juncus > subg. Poiophylli | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | J. falcatus var. paniculatus | J. dichotomus var. platyphyllus, J. tenuis var. dichotomus, J. tenuis var. platyphyllus, J. platyphyllus | ||||
Name authority | Piper: Contributions from the U. S. National Herbarium 11: 182. (1906) | Elliott | ||||
Web links |
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