Sentence:  In almost every family enumerated, the per centage is in favour of naked or wingless seeds, remarkably so in "Dipsaceæ", where 11 per cent. of species with <WSD>calvous</WSD> seeds are widely dispersed, while only 3 per cent. of those furnished with pappus enjoy as wide a range. Among the Compositæ the proportions are as 4·5 to 2·9 per cent. in favour of <WSD>calvous</WSD> seeds, by which it should follow that daisies were twice as diffusable as thistles or dandelion. 
Meaning of the word marked with <WSD> tags:  Lacking bristles or pappuses.