Pin (a, c, e, g) and thrum (b, d, f, h) pollen grains of Primula

File:Pollen grains on the surface of a stigma(Primula vulgaris).jpg - Wikimedia Commons

IJMS, Free Full-Text

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

PDF] Heteromorphy and Flower Development in Primula

a–p. SEM images of acetolysed pollen grains of distylous (a–l) and

The rapid appearance of homostyly in a cultivated distylous population of Primula forbesii - Liu - 2022 - Ecology and Evolution - Wiley Online Library

Long stigma flower hi-res stock photography and images - Page 6 - Alamy

Pin (a, c, e, g) and thrum (b, d, f, h) pollen grains of Primula

Different types of Primrose flowers - pin-eyed and thrum-eyed