Juncus imbricatus
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| Laharpe |
Juncus imbricatus is a plant species from the rush family(Juncaceae) thatoriginally only occurs in South America.
features
Juncus imbricatus is a perennial , herbaceous plant . It reaches heights of growth of 15 to 45 cm. It has a creeping rhizome 2 to 3 mm in diameter. It is covered with a filamentous, dark brown layer of sclerenchyma fibers , remains of disintegrated cataphylls and leaf bases. The internodesare short, the stems are therefore in dense rows. The plants form lawns. The stems stand upright and have a diameter of 0.5 to 1.5 mm. There are 3 to 4 cataphylls per stem, which are up to 5 cm long, dark brown, sometimes yellowish brown to light green and have a rudimentary leaf blade of up to 5 mm. The leaves are all basal, one or two per stem and are 10 to 35 cm long. The leaf sheath is 1.5 to 6 cm long. The blade is filamentous with a diameter of 0.6 to 1 mm and is hollow.
The inflorescence is terminal consists of 2 to 4 (rarely 1) one-sided cymes with 1 to 30 flowers. The lower bract is similar to the basal leaves, is herbaceous, up to 8 cm long and towers above the inflorescence. It can also be shorter than the inflorescence. The other bracts are shorter, the last only about 3 mm long.
Each flower is surrounded by two 1.5 to 2 mm long pre-leaves. The tepals are uneven, lanceolate, have a green central rib and maroon edges. The outer tepals are 3.5 to 5 mm long, the inner 3 to 4 mm. The six stamens are 1.7 to 2.1 mm long, the stamens are straight and 0.8 to 1 mm long.
The capsule fruit is ellipsoidal, blunt to truncated at the tip, triangular with slightly concave sides. It is 3.5 to 5 mm long and 1.8 to 2.5 mm wide, chestnut brown and shiny, thick-walled when mature. The capsule is triple. The seeds are broadly ovate, asymmetrical, furrowed and brown.
Occurrence
Juncus imbricatus occurs predominantly in South America. In the Andes, the area extends from Colombia to northern Argentina. It also occurs in Concepción in Chile, in Corrientes in Argentina, in Uruguay and in the highlands south of Buenos Aires. Disjoint deposits still exist in Mexico, in the Cape region in South Africa, in Australia and in Portugal. In Portugal it is likely to be neophytic occurrences.
In the Andes, it often grows as a weed on roadsides and deserted fields at 2500 to 3800 m above sea level. Unusually for a representative of the rushes , the species usually grows in very dry locations.
supporting documents
- Henrik Balslev: Flora Neotropica, Volume 68: Juncaceae . New York Botanical Garden Press, New York 1996, pp. 83-85, ISSN 0071-5794
