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Purple nutsedge (C. rotundus) is another weedy sedge that is similar to the yellow nutsedge (C. esculentus). These two sedges are difficult to distinguish from each other and can be found growing on the same site. Some differences are the purple spikelets and the tubers formed by C. rotundus are often multiple instead of just one at the tip.
Cyperus strigosus is a species of sedge known by the common names false nutsedge and straw-colored flatsedge. It is native to the United States , Cuba and Canada , where it grows in wet areas in many habitat types, including disturbed and cultivated areas such as roadsides and crop fields.
Common names include papyrus sedges, flatsedges, nutsedges, umbrella-sedges and galingales. The stems are circular in cross-section in some, triangular in others, usually leafless for most of their length, with the slender grass -like leaves at the base of the plant, and in a whorl at the apex of the flowering stems.
Cyperus rotundus is a perennial plant, that may reach a height of up to 140 cm (55 in).The names "nut grass" and "nut sedge" – shared with the related species Cyperus esculentus – are derived from its tubers, that somewhat resemble nuts, although botanically they have nothing to do with nuts.
Cyperus flavescens, commonly known as the yellow flatsedge, is a species of flowering plant belonging to the family Cyperaceae. [2] It has cosmopolitan distribution. [2]
The annual sedge typically grows to a height of 0.1 to 0.75 metres (0.3 to 2.5 ft) and has a tufted habit. It blooms between May and December and produces green-yellow-brown flowers. [3] The erect and glabrous grass has fine and numerous roots. It as slender or rigidulous, trigonous stems that are 0.5 to 2.0 millimetres (0.020 to 0.079 in) thick.
Cyperus difformis is a species of sedge known by several common names, including variable flatsedge, [2] smallflower umbrella-sedge and rice sedge. [3] This plant is native to southern Europe , most of Africa and Asia , and Australia , and it is naturalized in other areas of the world, including large parts of the Americas.
Carex flava, called hedgehog grass or large yellow sedge, is a widespread species of sedge (genus Carex, family Cyperaceae), native to the northern United States, Canada, Iceland, Europe, the Atlas Mountains in Africa, the Transcaucasus area, and parts of Siberia. [2] [3] It is a synonym of the Carex flava species complex. [4]