Stuckenia filiformis ssp. alpina (Blytt) Haynes, D.H. Les, & M. Kral
|Stuckenia filiformis ssp. alpina
Family: Pondweed Family (Potamogetonaceae)
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The genus was named by Carl Borner (1880-1953), a German entomologist from Bremen, for Wilhelm Adolf Stucken (1860-1901), headmaster of the Gottingen Gymnasium and amateur botanist associated with the Bremen herbarium (Flora of Wisconsin website, Wikipedia contributors). The species name refers to its very narrow leaves and the subspecies to its northern distribution although it occurs farther to the south than the subspecies filiformis which only occurs in northern Canada, Alaska, and Greenland (Flora of North America 2000).
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There are 2 verified occurrences, ?about 15 historical occurrences of spp. alpina, and 1 verified occurrence and 5 historical occurrences of ssp. occidentalis. The subspecies are being combined into Stuckenia filiformis (Werier 2015).
The short term trend may be a decline but remains unknown because only three populations are extant as of 1988, and precise counts have not been made during recent surveys. An additional historical population may have disappeared as it could not be relocated during the most recent survey in 1998. Resurveys with population counts are needed to establish a baseline for trend assessment.
The long term trend appears to be a significant decline in populations. One population has been extirpated, ?three populations have been confirmed as extant but lack specific counts, and the remaining 20 historical records (from 1940's or earlier) have not been resurveyed.