devil's horsewhip (achyranthes aspera) plants with inflorescence growing wild.

amaranthaceae inflorescence achyranthes chaffflower distributed environment introduced herbaceous membranous horsewhip perennial petiolate medicinal beautiful undefined tropical invasive branched peduncle perianth ayurveda prickly growing species closeup flowers natural outdoor aspera flower devils violet purple leaves garden bracts stamen fruits nature botany chaff plant erect hairy green nodes spike flora weed wild herb stem pink seed dry