A provenance trial of Pinus oocarpa Schiede and P. patula Schiede and Deppe spp. tecunumanii (Eguiluz and Perry) Styles of the international series coordinated by the Oxford Forestry Institute, University of Oxford, was established at Conocoto, Ecuador in 1973. This trial was assessed in 1979 for volume under bark and wood density and these two traits plus the derived indices of within sample density variation and dry matter index were analyzed. There were no statistically significant differences between provenances for the four assessed characteristics, but provenances of P. patula spp. tecunumanii were superior in volume under bark to provenances of P. oocarpa.
WRIGHT, J.A., GIBSON, G.L. AND BARNES, R.D. (1990). Variation in volume and wood density of eight provenances of Pinus oocarpa and P. patula subsp. tecunumanii in Conocoto, Ecuador. IPEF. 41-42. pp. 55-57.