Dunnet Regional Park
Note the glabrous surface.
Sprengelii: Answers to key questions in Sedges
(Carex) of Saskatchewan, Fascicle 3, Flora of Saskatchewan leading to this species. The
answers are in the order you would normally work through the key.
Stigmas 3; achenes three-sided,
occasionally terete, though their shape may be concealed by flattened
perigynia. NOT [stigmas 2; achenes lenticular]
Spikes 2 or more per culm, terminal and
lateral; spike bracts present on lateral spikes (except in Section Phyllostachyae),
lowest bract usually evident, often conspicuous. NOT [Spikes 1 per
culm, terminal; spike bracts absent].
Lower pistillate scales not bract-like or
leaf-like but similar in size and shape to individual perigynia (up to
twice as long as perigynia in C. magellanica ssp. irrigua).
NOT [Lower pistillate scales resembling green, leaf-like bracts much
longer and wider than individual perigynia]
Perigynia glabrous. NOT [Perigynia
sparsely to densely pubescent or puberulent (in C. pedunculata
pubescence represented by very short hairs scattered near tip; in some
species of Section Acrocystis, perigynia may be glabrous or
virtually hairless, but all members of this group have convexly 3-sided
to terete achenes with tight fitting perigynia and a stipe-like base
about equal to beak in length)]
Beak over 0.5 mm long and usually visibly
bidentate (teeth hyaline in C. sprengelii, inconspicuous in C.
viridula, very short in C. oligosperma). NOT [Beak
absent or less than 0.5 mm long; if more than 0.5 mm long, then
terminating in an orifice without teeth]
Style jointed at base and deciduous from
achene, if present at maturity, breaks of readily when manipulated. NOT
[Style continuous with achene and persisting at maturity as a long,
curved or straight prong]
Lower pistillate spikes with filiform
stalks 2-7+ cm long; basal sheaths shredding to a mass of brown fibers
persisting on crown. NOT [All pistillate spikes sessile or nearly so;
base of plant lacking brown fibers. Section Ceratocystis (C.
cryptolepis, C. viridula)]