4d92f26a3a7040c7220e5d82480a340d

FAGACEAE

Quercus ajoensis C.H.Mull.

Location: Arizona, US; Ajo Mountains, Organ Pipe Cactus National Monument, 2 individuals from a dense local population limited to this area (100m stretch) in the south fork of Alamo Canyon (more discrete populations may be present up canyon, also in Arch Canyon); 40 m down canyon from individual #1. UTM: 338320, 3548917 (+/- 3m accuracy); Elevation: 734 m.

Plant Attributes: Still a few flowers, few acorns, 3-stem tree, 3m height, dbh: 12cm.

Habitat/Associates: n-flowing drainage, grove of oaks; surrounding canyon slopes are a dry rocky desert shrubland of Lycium sp., Simmondsia chinensis, Acacia greggii. In scrubby drainage: Celtis reticulata trees, Sapindus sp., Dodonea viscosa, Prosopis velutina, Ambrosia cordifolia, Baccharis emoryi.

Beth Fallon

# JCB-US-AZ-AM-AJ-2 (AZ-ORPI Q. ajoensis-2)

July 22, 2012

Phylogeny of the oaks of the Americas: Diversification of an ecologically important clade across the tropical-temperate divide. (2012-2015 NSF Grant, DEB 114648)