Duck Mountain Provincial Park
Note the leaves are borne singly and are spirally
The key answers below are taken from Conifers
& Catkin-Bearing Trees and Shrubs of Saskatchewan by George Argus,
Vernon Harms, Anna Leighton, and Mary Vetter. This book is published
jointly by Flora of Saskatchewan Association and Nature Saskatchewan.
Glauca: Answers to key questions
leading to this species.
Seed cones ovoid-oblong, deciduous,
falling the first winter, 2.5-6 (7) cm long; seed cone scales 10-16 mm
long, margin near apex +/- entire; needles (0.8) 1.5-2 (2.5) cm long,
mostly sharp-pointed, glaucous, green or blue-green; twigs and bud
scales glabrous. NOT [Seed cones ovoid-subglobose, persisting on
tree for several years, 1.5-2.5 (3.5) cm long; seed cone scales 8-12 mm
long, margin at apex irregularly toothed; needles 0.6-1.5 (2) cm long,
mostly blunt-tipped, glaucous, blue- to grey-green; twigs and bud scales
Picea: Answers to key questions
leading to this genus.
borne singly along branches, not in fascicles scaly-sheathed at base or
on short shoots. NOT [Needles on year-old and older
branches borne either in groups (fascicles) of 2 with each fascicle
scaly-sheathed at base at least when young, or in clusters of 12-25 on
short shoots with clusters not scaly sheathed.]
Needles 4-angled in cross-section, either sharp-pointed or blunt-tipped,
rigid; seed cones falling as a unit, not disintegrating by shedding scales
individually from cone axis; twigs conspicuously roughened by decurrent, spreading
or appressed, peg-like projections (pulvini) persisting after needles fall.
NOT [Needles flattened, frequently grooved adaxially, usually rounded or
notched at apex, flexible; seed-cones not falling whole but scale by scale,
leaving naked cone axes persisting as erect "spikes" on branches;
twigs not roughened by decurrent, projecting, peg-like leaf-bases.]
Pinaceae: Answers to key questions
leading to this family.
Leaves needle-like, alternate or
fascicled/clustered, shed individually from branchlets (usually shed as
fascicles in Pinus); seed cone scales imbricate; seed cones dry;
seeds adaxial and 2 per scale. NOT [Leaves needle-like or
scale-like, alternate, opposite or whorled, persistent on shoots,
shedding with branchlets with age; seed cone scales fused or imbricate;
seed cones berry-like (Juniperus) or dry (Thuja); seeds
adaxial or terminal and 1-20 per scale.]