Apr
5
tree
sperm
invades
Welcome Spring!
allergies attack
warm weather greeted with sneezing
Pollen from a variety of common plants: sunflower (Helianthus annuus), morning glory (Ipomoea purpurea), hollyhock (Sildalcea malviflora), lily (Lilium auratum), primrose (Oenothera fruticosa) and castor bean (Ricinus communis).
Source and public domain notice at Dartmouth Electron Microscope Facility
