Family: Sedge Family (Cyperaceae)
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This species is named in honor of Zaccheus Collins who lived from 1764-1831 (Fernald 1970).
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There are four known populations and more than twenty historical locations, all restricted to Long Island and Staten Island. A number of the historical locations are either considered extirpated or have been surveyed without finding this plant. Only one site has more than a hundred culms. This site is actually quite large, possibly over a thousand culms, and it is the only site on protected land where management practices take the needs of this plant into account. This is a very unique looking sedge, making it difficult to overlook. Few to no new populations are expected.
There are only four populations that have been seen in recent years. One of these populations is quite large. The extent of the other populations is unknown or fairly small. No data is available on short-term trends for this species in New York. Therefore, short term trends are unknown.
Three populations are believed to have been extirpated sometime in the 1900's due to urbanization. A few other populations have been searched for without success. There are an additional about 15 populations that are only known from historical records. It is unknown if these populations are still extant. Carex collinsii is a very habitat specific plant. The habitat it occurs in is very limited in distribution. Overall, exact long-term trends are unknown but clearly show at least some decline.