Trelease, W. 1911. Proc. Amer. Philos. Soc. 50 : 417.
Type Status:
Isosyntype
Place:
Rocky hills near Chihuahua., Chihuahua, Mexico, North America
Collection Date:
May 1885
Notes:
Protologue cites 2 collections ("Pringle 1, 2, 1885, - the type"); collections made on different dates (April, flowers; May, fruit and leaves) and are syntypes