aster family,Asteraceae,Compositae,family Asteraceae,family Compositae- plants with heads composed of many florets: aster; daisy; dandelion; goldenrod; marigold; lettuces; ragweed; sunflower; thistle; zinnia cineraria,Pericallis cruenta,Senecio cruentus- herb of Canary Islands widely cultivated for its...
Ragweed pollen observed under an electron microscope. Credit: Lewis Ziska Spring is in the air, and for many people that means allergy season is rearing its ugly head. If it feels like your allergies have recently gotten worse, there’s now data to back that up. ...