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

Summary: Key to Juniperus of Continental North America 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 seed cones tan-brown to brownish
purple.
3a. Whip- and scale-leaf margins with irregular teeth (40 X), scale-leaves acuminate; tan-
brown to brownish-purple; branches pendulous to slightly erect
3.1a. Seed cones 9-20 mm diam., (4) 6 - 10 (-13) seeds per cone, terminal branch tips
drooping (hanging)
3.2a. Branching radially, seed cones tan to brownish/purple........................J. flaccida
3.2b. Branching planate, seed cones bluish-brown.........................................J. poblana
3.1b. Seed cones (5-) 6 (-9) mm diam., 1-2 (3) seeds per cone, terminal branch tips erect
...........................................................................................................................J. martinezii
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

  

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

 

Collections: Biology and Medicine