Alternanthera philoxeroides	Alternanthera sessilis	Alternanthera reineckii	Ludwigia palustris	Eclipta prostrata	Portulaca oleraceae
inflorescence pedunculate, globular	inflorescence sessile, globular	inflorescence sessile, elongate	flowers sessile, not grouped in inflorescences	inflorescence pedunculate, globular	flowers sessile, not grouped in inflorescences
2 rows of hairs on young stems, stem hollow	2 rows of hairs on young stems, stem massif	stem hairy, not in rows, stem massif	stem glabrous	stem hairy, not in rows	stem glabrous
Version February 2023