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Juniperus ashei J. Buchholz - syn.Juniperus sabinoides (Kunth) Nees - Cupressaceae - Ashe juniper, mountain cedar
Dioecious tree, up to 15m tall, „Ashe juniper is a source of Texas-cedarwood oil and fence posts.“ http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233500722
„Drought-tolerant evergreen shrub or small tree, native to northeastern Mexico and the south-central United States north to southern Missouri; the largest areas are in central Texas, where extensive stands occur.“
http://en.wikipedia.org/wiki/Juniperus_ashei
The volatile wood oil of J.ashei („Texas cedarwood oil“) contains α-cedrene (30%), thujopsene (25%), β-cedrene (5%), α-cedrol (19%) widdrol (1%), cuparene (1%), and α-bisabolol (0.4%).
[Adams, R. P. „Cedar wood oil—Analyses and properties.“ Essential oils and waxes. Springer Berlin Heidelberg, 1991, 159-173] http://www.juniperus.org/uploads/2/2/6/3/22639912/99-1991sprverlag159-173.pdf