Insect pollinators of Penstemon series Graciles (Scrophulariaceae) with notes on Osmia and other Megachilidae
By: [by] Frank S. Crosswhite and Carol D. Crosswhite
Published: 1966
Language: eng
Number of pages: 467
Notes: (Repr. The American Midland Naturalist, v. 76, no. 2, 1966)