旧大陆的猪笼草
Works of interest include a 3-volume flora of the genus "Drosera" (2017), a 2-volume flora of the genus "Pinguicula" (2016), a 2-volume flora of "Nepenthes", titled "Pitcher Plants of the Old World" (2009), for which he co-authored the species descriptions, and a range of "Nepenthes" field guides.