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Juncus cognatus Kunth
Family Juncaceae
Juncus cognatus Kunth APNI*

Description: Tufted to shortly rhizomatous perennial.

Culms terete, 25–65 cm long, 0.7–1.5 mm diam.

Leaves basal, shorter than culms; blade canaliculate, 0.5–1.3 mm wide; auricles shorter than or equalling 0.5 mm long; sheath pale yellowish. Inflorescence terminal, diffuse, 2–6 cm long, usually 5–25-flowered; flowers solitary; involucral bract 1, well-developed, 2–10 cm long, longer than or equalling inflorescence (rarely shorter). Tepals straw-brown, occasionally red-tinged in midrib region, with ± broad hyaline to pale yellowish margins; outer tepals 3.0–3.7 mm long, longer than or equalling inner tepals. Stamens 6, shorter than outer tepals; anthers 0.3–0.6 mm, shorter than filaments.

Capsule ± equally outer tepals, ellipsoid, obtuse, apiculate, golden brown.



Flowering: spring–summer.

Distribution and occurrence: Naturalised, scattered, especially around towns and other disturbed areas, south along the coast to Wallaga Lake, along the tablelands and western slopes to Sydney region. Native of S Amer.
NSW subdivisions: *NC, *CC, *SC, *NT, *CT, *CWS, *NWP
Other Australian states: *Qld
AVH map***

Some botanists treat this as a synonym of J. dichotomus Elliott from North America. However, these taxa and J. tenuis belong to a complex that needs further study throughout their native range (the Americas).

Text by K. L. Wilson, L. A. S. Johnson & P. Bankoff (1993); edited KL Wilson (June 2010)
Taxon concept: Flora of NSW 4 (1993)

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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