“Indian Milkweed”, “Woolly Milkweed” or Asclepias eriocarpa this is a native to Southwest areas. This has 1 confirmed butterfly host and 3 more likely according to calscape.org. 

Available at Moosa Creek Nursery, give time for orders. https://www.moosacreeknursery.com/Native_Plants/561/Asclepias-ericorpa