Table 1. Geographic location, elevation and vegetation type of Stenocereus thurberi populations used for genetic analysis in this study.

Population	N	Latitude N	Longitude W	Elevation (m)	Vegetation
Sonoyta	44	31° 48´ 17´´	112° 51´ 56´´	512	Arizona Upland1
Magdalena	45	30° 40´ 57´´	110° 58´ 46´´	964	Arizona Upland1
Carbó	42	29° 34´ 06´´	111° 05´ 29´´	501	Plains of Sonora1
Bahía de Kino	30	28° 52´ 56´´	112° 01´ 39´´	60	Central Gulf Coast1
Tecoripa	30	28° 37´ 50´´	109° 57´ 42´´	411	Foothills Thornscrub3
Las Guásimas	43	27° 52´ 10´´	110° 28´ 55´´	5	Central Gulf Coast1,2
Tayopa	40	28° 20´ 16´´	109° 13´ 06´´	730	Tropical deciduous forest3
Masiaca	43	26° 38´ 12´´	109° 18´ 39´´	15	Coastal scrub3

N = number of sampled individuals.

¹Sonoran Desert according to Shreve [49].

²Transition with coastal scrub.

³Not part of the Sonoran Desert [48].