melanthera nivea inflorescence close up view

flower plant wildflower meadow nature prairie green herb blossom leaf field petal grassland lawn melanthera nivea inflorescence close view coarse leaves simple shape variable lower hastate-lobed upper oblong base cuneate margin toothed apex acute obtuse head white disk florets ray absent anthers black achenes pubescent apical bristles asteraceaecoarse asteraceae family common pineland squarestem snow tropical grows americas maya biosphere reserve mbr inflorescence family squarestem americas bristles petén guatemala