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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Poales

Familia: Juncaceae
Genus: Juncus
Species: Juncus dubius

Juncus dubius Engelm., 1868

Juncus dubius f. rugulosus (Engelm.) Hoover
Juncus rugulosus Engelm.

Native distribution areas:

Continental: Northern America
'Regional:Southwestern USA
USA (California)
'Regional: Mexico
Mexico (Baja California Norte)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Engelmann, G., 1868. Trans. Acad. Sci. St. Louis 2: 459 (1868).

Additional references

Kirschner, J. & al. (2002). Juncaceae Species Plantarum: Flora of the World 6-8: 1-237, 1-336,1-192. Australian Biological Resources Study, Canberra.


Govaerts, R. et al. 2022. Juncus dubius in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2022 Mar 06. Reference page.
Hassler, M. 2022. Juncus dubius. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2022. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2022 Mar 06. Reference page. 2022. Juncus dubius. Missouri Botanical Garden. Published online. Accessed: 06 Mar 2022.
International Plant Names Index. 2022. Juncus dubius. Published online. Accessed: Mar 06 2022.
Juncus dubius – Taxon details on Integrated Taxonomic Information System (ITIS).

Vernacular names
English: dubius rush, Mariposa rush

Juncus dubius is a species of rush known by the common name wrinkled rush. It is endemic to California, in the California Coast Ranges, Transverse Ranges, and southern Sierra Nevada.[2] It is a common member of the flora in many wet areas, such as marshes and riverbanks.

Juncus dubius is a perennial herb growing in thick tufts from a horizontal rhizome. The stem is erect and green and has a distinctive wrinkled, rippled surface. It reaches a maximum height near 70 centimeters. There are few leaves, those growing at the base lacking blades and appearing as sheaths around the stem, and those further up the stem having cylindrical blades.

The inflorescence is open, with spreading branches holding many small clusters of a few flowers each. There are small, clear bracts. Each flower has reddish or brownish green tepals with thin, transparent margins, and bristles at the tip. There are six stamens.

The fruit is a red or brown capsule which is larger than the flower in which it grows.

"Juncus dubius". The Plant List. Retrieved December 4, 2018.
Calflora database: Juncus rugulosus . 2.12.2013

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