in this way they took notes and made sketches of about twenty-five specimen in an hourplants , insects , birds and amphibians , including a pied-billed grebe , two species of cattail , two different dragonflies , a little sulphur butterfly with black-tipped yellow wings , new england aster , a daisy-like flower purplish in color with a hairy stem and smooth , toothless leaves , a marsh wren and the like .