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Key to Juniperus of Canada and the United States rev. 2/2011 1a. Leaves all acicular (subulate, jointed at the base) and spreading; seed cones sessile, axillary;
 

Summary: Key to Juniperus of Canada and the United States rev. 2/2011
1a. Leaves all acicular (subulate, jointed at the base) and spreading; seed cones sessile, axillary;
decumbent or rarely upright shrubs (in the western hemisphere)........................J. communis
1b. Leaves decurrent (not jointed at the base), both whip- and scale-like; seed cones terminal;
trees or decumbent to upright shrubs.
2a. Whip- and scale-leaf margins entire (20 X) or with irregular teeth (40 X) and then with
scale-leaves with acuminate to mucronate tips and tan-brown to brownish purple seed
cones.
3a. Whip- and scale-leaf margins with irregular teeth (40 X), scale-leaves acuminate; seed
cones (4-) 6-10 (-13) seeded, and tan-brown to brownish-purple; branches
pendulous (weeping)..................................................................................................J. flaccida
3b. Whip- and scale-leaf margins smooth (entire) (40 X), scale-leaves obtuse to acute to
apiculate; seed cones 1-2(3) seeded, blue-black to brownish-blue when mature;
branches not drooping (but ultimate branchlets are often flaccid).
4a. Prostrate to decumbent shrub; scale-leaves apiculate; both whip- and scale-leaves
growing along the branchlets; peduncles generally curved.......................J. horizontalis
4b. Tree with 1(2-3) stems and rounded, flattened, pyramidal, or strict crowns;
scale-leaves obtuse to acute; whip-leaves growing only at branchlet tips (on mature
trees); peduncles generally straight.
5a. Scale-leaves not overlapping, or, if so, not by more than 1/5 the length, obtuse to

  

Source: Adams, Robert P. - Department of Biology, Baylor University

 

Collections: Biology and Medicine