Alexander Krings

• Guide to tendrillate climbers of Costa Rican mountains
• Guide to the vascular flora of Howell Woods, Johnston County, North Carolina, U.S.A.
• Guide to the vascular flora of Kitty Hawk Woods, Dare County, North Carolina, U.S.A.
• Guide to the vascular flora of Picture Creek Diabase Barrens
• Manual of the vascular flora of Nags Head Woods, Outer Banks, North Carolina