This vegetation type in the region remains little known. Pine forest , on basaltic substrate at 1600-2600 m. The evergreen trees are 25-40 m tall. Dominant are Pinus ayacahuite , P . P . lawsonii , P .
Grasses dominate the lower stratum.
Some individuals of the rare Abies guatemalensis and also A . Precipitation is relatively low, with a summer dry season. The dominants are Quercus crassifolia , Q . Return to Top Flora Located in the Mixteca-Oaxaque a Floristic Province, the Sierra de Ju rez is one of Oaxaca State's wettest and foristically richest areas, with probably 2000 of the 8000 or more species in Oaxaca. Although knowledge of the sierra's flora is limited, the number of endemics is expected to be significant.