cowslip vs mayweed

cowslip

noun
  • A low-growing plant, Primula veris, with yellow flowers. 

  • Primula deorum, a flowering plant known as God's cowslip and rila cowslip 

  • Primula florindae, a flowering plant known as giant cowslip and Tibetan cowslip 

  • marsh marigold, Caltha palustris, a plant in the buttercup family, growing in wet, boggy locations. 

  • Pulmonaria angustifolia, blue cowslip or narrow-leaved lungwort 

  • Primula sikkimensis, a flowering plant known as Himalayan cowslip and Sikkim cowslip 

mayweed

noun
  • A mayflower. 

  • corn chamomile, field chamomile, Anthemis arvensis. 

  • Plants of the genera Matricaria and Tripleurospermum. 

  • stinking chamomile, Anthemis cotula. 

How often have the words cowslip and mayweed occurred in a corpus of books? (source: Google Ngram Viewer )