Scale and Perigynium, Abaxial View
Trail to Fire Tower at Brockelbank Hill,
North of Townsend Lake on Highway # 980
This perigynium is
from the middle of the spike. Note the three stigmas.
Answers to key questions in Sedges (Carex) of Saskatchewan, Fascicle 3,
Flora of Saskatchewan by Anna Leighton leading to this species. The
answers are in the order you would normally work through the key.
achenes three-sided, occasionally terete, though their shape may be
concealed by flattened perigynia. NOT [Stigmas 2; achenes lenticular]
per culm, terminal; spike bracts absent; NOT [Spikes 2 or more per culm,
terminal and lateral; spike bracts present on lateral spikes (except in
Section Phyllostachyae), lowest bract usually evident, often
androgynous; plants monoecious; perigynia 1-18 per spike; if perigynia
pubescent then plants caespitose. NOT [Spike unisexual; plants
dioecious; pistillate spike narrowly cylindrical, 10-30 (40) mm long;
perigynia 50-100 per spike; plants rhizomatous with pubescent perigynia]
pistillate scales not bract-like or leaf-like but similar in size and
shape to individual perigynia; NOT [Lower pistillate scales resembling
green, leaf-like bracts much longer and wider than individual perigynia.
Section Phyllostachyae (C. backii, C. saximontana)]
either 6-8 mm long with ill-defined beak, or shorter than 3.5 mm and
beakless. NOT [Perigynia to 3.5 (4.8) mm long with beak between
0.2 and 0.8 mm long.]
to 3.5 mm long, rounded and often slightly notched at tip, appressed at
maturity; style jointed at base and deciduous from achene; staminate
scales about 1 mm long and joined along lower margins to form a short
sheathing cylinder; plants widespread in moist, shady habitats.
NOT [Perigynia 6-8 mm long, narrowly lanceolate, long tapering, reflexed
at maturity; style continuous with achene and persisting as a long
prong; staminate scales 4-6 mm long and not joined along lower margins;
plants of northern fens and bogs.]