Achene Multiple Views
Highway # 9 at Overflowing River, North of Hudson Bay, SK
A single achene has been rotated about its long axis in increments of 90 degrees. Note the achene is biconvex. Note also the apex of the achene has a distinct neck. This is true in most, but not all, specimens of E. palustris.
Eleocharis palustris is a member of the Eleocharis palustris complex. This complex contains a number of difficult to distinguish species. Flora of North America (FNA) recognizes seven:
|E. kamtschatica (coastal species, not found and not expected to be found in SK)|
|E. ambigens (coastal species, not found and not expected to be found in SK|
The following characters are used in the portion of the FNA key which pertains to the E. palustris complex:
|Distal Leaf Sheath Apex with/without Distinct, Abrupt Tooth|
|# Floral Scales per mm of Rachilla|
|Proximal Scale Clasps How Much of Culm|
|Proportion Subproximal Scales Without Flower|
|Flattened Floral Scale Dimensions|
|# of Perianth Bristles|
|Perianth Bristles Relative Size|
|Achene Apex with/without Distinct Neck|
|Tubercle Size Compared to Achene|
|Tubercle Height to Width|
The character states (of the above characters) for all members of the E. palustris complex are found in this table. These character states are taken from the species descriptions (not the key) in Flora of North America.
The portion of the FNA key which pertains to the E. palustris complex is found here. Species not found in Saskatchewan are noted.