beautiful melanthera nivea white disk floret

plant flower shrub leaf wildflower green herb blossom tree nature evergreen branch petal melanthera nivea inflorescence asteraceae family pineland squarestem snow tropical grows americas coarse tall 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 observed maya biosphere reserve mbr petén guatemala beautiful floret