Drosera anglica Huds.
Common Name: ENGLISH SUNDEW
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb
Status: SC
Drosera anglica habit A. A. Reznicek habit

Sphagnum "lawns" in bogs, especially near water, fens, rock pools (Isle Royale), marly shores.

This circumpolar species is a tetraploid derived from hybridization of the northern North American Drosera linearis with the very widespread D. rotundifolia and doubling of the chromosome number. In Michigan, this is widespread, but local in the Upper Peninsula, especially near Lake Superior, with records from Chippewa Co., Keweenaw Co. (including Isle Royale), Luce Co., Marquette Co., and Schoolcraft Co.

The F1 hybrid, however, which bears the name Drosera ×woodii R. Gauthier & Gervais, also occurs in Michigan, and may be expected in fens and Interdunal calcareous flats, wherever the parents grow near each other. Drosera linearis ranges farther south in Michigan than D. anglica and, so far as known, all "anglica" plants mapped from the Lower Peninsula are the primary hybrid, as is at least one collection from Luce Co.

These hybrids are sterile, the pollen malformed and ovules and seeds aborting with no ripe fruit developing. Like the parents (and D. intermedia) they are diploid (2n = 20). Otherwise, they may be morphologically very similar to the fertile tetraploid. There is a general tendency for D. anglica to have proportionatly more narrowly spathulate leaves, though this is a subtle difference. Naturally, the sterile hybrid can be strongly suspected when solitary or few scattered plants are seen intermingled with D. linearis and D. rotundifolia, rather than forming substantial populations.

 

 

Locations

Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Emmet County
Keweenaw County
    Including Isle Royale
Livingston County
Luce County
Marquette County
Oakland County
Presque Isle County
Schoolcraft County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. April 23, 2019. https://www.michiganflora.net/species.aspx?id=1175.