In humid or wet sites especially rich bog-communities called vegas, growth is dominated by Juncaceae, Cyperaceae and grasses.    From Wordnik.com.  [Southern Andean steppe] Reference

In humid or wet places of these forests especially rich raised bog-communities grow dominated by Sphagnum, Juncaceae, Cyperaceae and grasses.    From Wordnik.com.  [Magellanic subpolar forests] Reference

Tall herbfields grow on well-developed humus soils, dominated by species of Compositae, Cyperaceae, Gramineae, Juncaceae, Ranunculaceae, and Umbelliferae.    From Wordnik.com.  [Australian Alps montane grasslands] Reference

Juncaceae and the palms (series Calycinae) where the perianth loses its petaloid character and thence to the Aroids, screw-pines and others where it is more or less aborted (series Nudiflorae).    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1] Reference

In areas with wet soils and near streams Cyperaceae and Juncaceae dominate, with some genera forming dense and hard wind-pollinated cushions such as Oxychloe and Patosia together with beautiful large-flowered forbs such as Mimulus, Euphrasia and Senecio species.    From Wordnik.com.  [Southern Andean steppe] Reference

I fancy, from a paper by Don, that some genera of grasses (i.e. Juncus or Juncaceae) are widely diffused over the world, and certainly many of their species have very wide ranges -- in short, it seems that my question is whether there is any relation between the ranges of genera and of individual species, without any relation to the size of the genera.    From Wordnik.com.  [More Letters of Charles Darwin — Volume 1] Reference