Afbeeldingen van zeldzaame gewassen (Tab. XXVI) BHL285531.jpg
Sideritis hirsuta procumbens - Stregpmoa - Crapaudine (NYPL b14444147-1125190).tiff
Global Biodiversity Information Facility
World Checklist of Selected Plant Families
Open Tree of Life reference taxonomy version 3.2
Species Plantarum. 1st Edition, Volume 2