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Three juniper species are native to Guatemala and Chiapas, Mexico: Juniperus comitana Mart., Juniperus gamboana Mart., andJuniperus standleyi Steyermark (l).Each of these species is endemic to the high mountains along the border of Guatemala and Chiapas, Mexico (2 ).J. comitana occurs on limestone hills, in pine-oak and Ficus-Acacia forests in the mountains of Chiapas, and on rocky hills in Guatemala at 1300-2300 m elevation (1,2). J. gamboana grows on limestone at 1670-2200 m in Chiapas and Departmento Huehuetenago, Guatemala (1,2). J. standleyi is found above timberline on Volcano Tacana in Chiapas and at elevations of 3000 m or higher in Departamento Huehuetenago, Guatemala (1,2). The ranges of these taxa are very restricted, and these species apparently have been isolated from the other junipers of the western hemisphere since Tertiary times (3). Although a recent study found prominantJuniperus pollen deposits in lake sediments dated at 8,815 and 10,750 b.p. ( 4), the geographically closest extant juniper population to the Pleistocene deposits is J. comitana, 200 km south and west at Baja Verapaz and Chiapas (4). Leyden (4) postulated that J. comitana descended 500 to 1000 m during arid portions of the Pleistocene in Guatemala. In any case, the ranges of these three taxa ofJuniperus have not been extensive in recent geological time.Although we have previously reported on the terpenoid similarities via numerical taxonomic procedures (3), this paper presents the first detailed identification of the steam-volatile leaf oil components of these junipers.

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The essential oil from the leaves of Lepechinia urbanii (Briq.) Epling from the Dominican Republic is dominated by δ‐car‐3‐ene (32.55%), δ‐copaene (13.82) and δ‐cadinene (12.51) with lesser amounts of β‐phellandrene (4.54), γ‐cadinene (3.41) and allo‐aromadendrene (2.83). Fifty‐six of 59 components were identified. Oil yield was 0.46 g/100g fresh weight (0.46%).