Pin (a, c, e, g) and thrum (b, d, f, h) pollen grains of Primula
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Flowers of Erythroxylum species studied in the Cerrado of central
Pin and thrum hi-res stock photography and images - Alamy
Forsythia - Trees and Shrubs Online
Integrative taxonomy of herbaceous plants with narrow fragmented distributions: A case study on Primula merrilliana species complex - He - 2022 - Journal of Systematics and Evolution - Wiley Online Library
Pin-eyed and Thrum-eyed Primrose Sheffield city nature diary by Penny Philcox
Tony's Blog: Thrum-eyed and pin-eyed
Seasonal changes in pollen limitation and femaleness along the snowmelt gradient in a distylous alpine herb, Primula modesta - Kameyama - 2015 - Ecology and Evolution - Wiley Online Library
IJMS, Free Full-Text
Pin and thrum hi-res stock photography and images - Alamy
Analysis of late stage flower development in Primula vulgaris reveals novel differences in cell morphology and temporal aspects of floral heteromorphy - Webster - 2006 - New Phytologist - Wiley Online Library
Genomic analyses of the Linum distyly supergene reveal convergent evolution at the molecular level
