Carex ×flavicans (F. Nylander) F. Nylander
Annotated by A.A. Reznicek, May 2007. Remarks: J. Cayouette, May 2007

Yukon Territory: Blow River Delta east, Danny C. Gordon's goose camp. Elev. 1 m
68.89552°, -136.96149°
Moist silty sand, slightly brackish, many dead Alnus in surrounding area from tidal flood of 1998. Dominated by Leymus mollis, Chrysanthemum arcticum, Calamagrostis canadensis, C. lapponica, Carex ramenskii, Puccinellia phryganodes, and P. tenella ssp. langeana. Revised by A.A. Reznicek May 2007 - is very young, but clearly has scales that are blunt and thin textured, even with hyaline apex. I'm not sure what this is, maybe again one of the C. aquatilis-subspathacea hybrids. The scales are quite long, and the culms are blunt, so I doubt it is just a young plants of Carex aquatilis var. minor, but it is perhaps too young to name with certainty. J.Cayouette - I was able to find some mature perigynia and achenes on with good pollen, (DAO 823541) = Carex ×flavicans (Nylander) Nylander. Pollen stainability = 16% with partly stained well formed grains, and many wall-deformed ones. From C. subspathacea, it shares the general habit, short stems and short vegetative shoots connected to the main plant by good long rhizomes; involucral bract partly clasping; staminate scales truncate; perigynium with a wider beak at base; one achene narrowly ellipsoid and dull, with truncate and retuse apex, and slight invagination; from C. aquatilis it shares the wider leaves mostly flat; the shape of the perigynia; the pistillate scales with narrow central band and acute to obtuse apex; one achene short obovoid or almost obtrigonous with truncate apex and somewhat shiny surface (but invaginated like subspathacea). Locally common. 1 duplicate (MICH; DAO; ALA; Yukon; Od).

B.A. Bennett 06-0120, July 28, 2006
With M.J. Oldham, C.E. Kennedy, P. Seccombe-Hett, D.C. Gordon
BABY, Accession: BABY-05911, Genetic barcoding: CCDB-23321-B2

Carex ×flavicans (F. Nylander) F. Nylander
Annotated by A.A. Reznicek, May 2007.

Yukon Territory: Blow River Delta east, Whitefish Station, outer delta. Elev. 3 m
68.88789°, -136.89429°
Invading tundra ponds with Carex aquatilis, C. mackenziei, and Hippuris tetraphylla. Was C. subspathacea by B.A. Bennett, revised by A.A. Reznicek May 2007 - this is not like anything I have ever seen in the north - they are somewhat broader leaved, with scales often having a mid-rib not even reach the apex, and otherwise not right (leaves too scabrous, and with clear midrib, perigynia and scales not coriaceous enough) but they are not C.ramenski, again becuse of the lack of any hint of an awn, and perigynia and scales not particularly coriaceous. What are these? One good possibility in Carex aquatilis X C. subspathacea (C.xflavicans). This is a rare hybrid in the east, and I have not seen it in any of my Alaskan material - but it would fit. I wondered if it could be simply small C. aquatilis, but they appeared to be too delicate, with rather rounded culms and longish scales. Hybrids involving C.ramenskii have been reported from Alaska, but I would suspect these to have broader leaves and a coarser habit. Common to abundant. 2 duplicates (MICH; DAO; Od).

B.A. Bennett 06-0302, July 30, 2006
With M.J. Oldham, C.E. Kennedy, P. Seccombe-Hett, D.C. Gordon
BABY, Accession: BABY-05913, Genetic barcoding: CCDB-23321-B4

Carex ×flavicans (F. Nylander) F. Nylander cf.
Annotated by A.A. Reznicek, May 2007.

Yukon Territory: Blow River Delta east, Whitefish Station, outer delta. Elev. 1 m
68.89053°, -136.91147°
Dominant forming nearly pure stands in moist meadows. Highly varieable at times resembling C. ramenskii and grading into Carex aquatilis. Ranging from under 6" in height to over 14". See collection #06-298. Stems rounded, some scales awned. Was C. subspathacea by B.A.Bennett, revised by A.A. Reznicek May 2007 - this is not like anything I have ever seen in the north - they are somewhat broader leaved, with scales often having a mid-rib not even reach the apex, and otherwise not right (leaves too scabrous, and with clear midrib, perigynia and scales not coriaceous enough) but they are not C.ramenski, again becuse of the lack of any hint of an awn, and perigynia and scales not particularly coriaceous. What are these? One good possibility in Carex aquatilis X C. subspathacea (C.xf lavicans). This is a rare hybrid in the east, and I have not seen it in any of my Alaskan material - but it would fit. I wondered if it could be simply small C. aquatilis, but they appeared to be too delicate, with rather rounded culms and longish scales. Hybrids involving C.ramenskii have been reported from Alaska, but I would suspect these to have broader leaves and a coarser habit. Common. 5 duplicates (MICH; DAO; Od).

B.A. Bennett 06-0309, July 30, 2006
With M.J. Oldham, C.E. Kennedy, P. Seccombe-Hett, D.C. Gordon
BABY, Accession: BABY-06229, Genetic barcoding: CCDB-23321-B1

Carex ×flavicans (F. Nylander) F .Nylander
Annotated by A.A. Reznicek, May 2007. Remarks: J. Cayouette, May 2007

Yukon Territory: Peel/Blow River Delta, Fish River. Elev. 2 m
68.8614°, -136.81165°
Patchy in low lying area surrounded by tundra. Was C. subspathacea by B.A. Bennett, revised by A.A. Reznicek May 2007 - this is not like anything I have ever seen in the north - they are somewhat broader leaved, with scales often having a mid-rib not even reach the apex, and otherwise not right (leaves too scabrous, and with clear midrib, perigynia and scales not coriaceous enough) but they are not C.ramenski, again becuse of the lack of any hint of an awn, and perigynia and scales not particularly coriaceous. What are these? One good possibility in Carex aquatilis X C. subspathacea (C.xflavicans). This is a rare hybrid in the east, and I have not seen it in any of my Alaskan material - but it would fit. I wondered if it could be simply small C. aquatilis, but they appeared to be too delicate, with rather rounded culms and longish scales. Hybrids involving C.ramenskii have been reported from Alaska, but I would suspect these to have broader leaves and a coarser habit. J.Cayouette - I was able to find some pollen grains on the staminate scales (DAO 823544) = Carex ×flavicans (Nylander) Nylander. Pollen stainability = 0%, based on only 25 grains collected on staminate scales, may be too old for good results. Looks like a small C. aquatilis with narrow spikes and leaves. From C. subspathacea, it shares the involucral bracts partly clasping; yellowish-green and narrower foliage; pistillate scales long and wide, with sometimes larger central band; perigynia with somewhat enlarged beak at base; from C. aquatilis it shares the general habit, narrow and elongate spikes, the wide basis of the flowering stem (leaf sheaths); general shape of perigynia. Uncommon. 3 duplicates (MICH; DAO; CAN).

B.A. Bennett 06-0341, July 31, 2006
With M.J. Oldham, C.E. Kennedy, P. Seccombe-Hett, D.C. Gordon
BABY, Accession: BABY-05914, Genetic barcoding: CCDB-23321-B3