Isoetes ×marensis D.M. Britt. & D.F. Brunt.

British Columbia: Small sand and gravel point, southeast shore of Mara Lake, 0.5 kilometer north of park, North Okanagan Regional District. Elev. 335 m.
50.72783° N, 119.031525° W
Coordinate Source: Specimen Label.
In 5-15 centimeters water, with Isoetes maritima, I. howellii (on shore), Equisetum fluviatile, Ranunculus flammula, Potamogeton richardsonii. Leaves straight, erect, much taller than parents at this site; uncommon submerged aquatic.

Peter F. Zika 28347, Aug 27, 2016
WTU, Accession: 412200, Barcode: WTU-V-026678

Isoetes ×marensis D.M. Britt. & D.F. Brunt.
Annotated by Frank Lomer, 2014.

British Columbia: Shuswap Lake, southwest end at Little River drainage, 880 m south of Adams River main channel, Quaaout No. 1 Native Reserve. Elev. 347 m
50.888° N, 119.557° W,
Datum: NAD83. Coordinate Source: Verbatim from Collector/Sheet.
Sandy spit, on higher ridge with fine gravel; growing with Gratiola neglecta, Plagiobothrys cognatus, stranded Potamogeton sp., Ranunculus flammula var. reptans. Megaspores variable in size, surfaces variably smooth to bumpy to low crested; abundance not noted, being mixed with Isoetes maritima and Isoetes howellii at site.

Frank Lomer 8937, 2014 Aug 19
UBC, Accession: V242148

Isoetes ×marensis D.M. Britt. & D.F. Brunt.
Annotated by Daniel F. Brunton, K.L. McIntosh, 2011.

British Columbia: 12 km south of Sicamous, 400 m north of Mara Lake Provincial Park, on small promontory along east shore of Mara Lake. Elev. 331 m
50.72738° N, 119.03114° W,
Datum: NAD 84. Coordinate Source: Verbatim from Collector/Sheet.
In sand amongst cobble in shallow (<0.5 m deep), fresh water with Eleocharis acicularis. Common; 17 of 18 Isoetes plants collected; type location.

Daniel F. Brunton 18076, 2011 Sep 08
With K.L. McIntosh
UBC, Accession: V244400