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Key to Juniperus of Mexico and Guatemala rev. 2/2011 1a.Whip-and scale-leaf margins entire (20 X) or with irregular teeth (40 X) and then with
 

Summary: Key to Juniperus of Mexico and Guatemala rev. 2/2011
1a.Whip- and scale-leaf margins entire (20 X) or with irregular teeth (40 X) and then with
scale-leaves with acuminate to mucronate tips.
2a. Whip- and scale-leaf with irregular teeth (40 X), scale-leaves acuminate; seed cones 1(2),
(4-) 6-10 (-13) seeded, tan-brown to brownish-purple; branches pendulous to erect.
2.1a. Seed cones 9-20 mm diam., (4) 6 - 10 (-13) seeds per cone, terminal branch tips
drooping (hanging)
3a. Branching radially, seed cones tan to brownish/purple...............................J. flaccida
3b. Branching planate, seed cones bluish-brown................................................J. poblana
2.1b. Seed cones (5-) 6 (-9) mm diam., 1-2 (3) seeds per cone, terminal branch tips erect
...............................................................................................................................J. martinezii
2b. 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.Seed cones bi-lobed (reniform), with a few globose, seed cones maturing 1 year.
5a. Scale-leaves acute to acuminate.................................................................................J. blancoi
5b. Scale-leaves with mucronate tips...............................................J. blancoi var. mucronata
4b. Seed cones globose, rarely bi-lobed, twigs (6-15 mm diam.) with bark exfoliating in
plates, reddish-copper beneath; seed cones maturing in 2 years.................J. scopulorum
1b. Whip- and scale-leaf margins denticulate (20 X)

  

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

 

Collections: Biology and Medicine