Species of grass-like plant
Carex acaulis, known as the small dusky sedge,[1] is a species of sedge in the genus Carex native to the Falkland Islands and southern Argentina.
Description
Carex acaulis has at least two flowering spikes; the terminal one contains staminate (male) flowers and is 6–10 millimetres (0.24–0.39 in) long, while the others contain pistillate (female) flowers, each of which is subtended by a 2.5–3.7-millimetre (0.10–0.15 in) scale and may produce a utricle up to 9 mm (0.35 in) long.[2] Carex acaulis is very similar to the closely related species C. macrosolen, and the ranges of the two species overlap,[3] but C. macrosolen has much longer utricles than C. acaulis, at 10–24 mm (0.39–0.94 in) long.[2]
Taxonomy and distribution
Carex acaulis was first described by Jules Dumont d'Urville in 1826. He based his description on type material from near Port Louis on East Falkland Island.[3] The holotype was deposited at the Muséum national d'Histoire naturelle in Paris.[3] The species has subsequently been reported from Patagonia and Tierra del Fuego in Argentina, although the Fuegian reports are considered suspect by the sedge expert Gerald Allen Wheeler; many of them actually refer to specimens of Carex sagei.[3][4]
Conservation and ecology
Like many other sedges, Carex acaulis is restricted to wet habitats, such as bogs and lake margins.[3] It is not included on the IUCN Red List, but it is rare in the Falkland Islands, and is listed nationally as a vulnerable species.[1]
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