Which perennial herb is also known as milfoil?
Stanchweed Staunchweed Achillea ambigua Achillea lanata Old man's mustard Devil's plaything Carpenter's weed Thousand Seal Thousandleaf Bad man's plaything Achillea ossica Achillea bicolor Thousand-seal Achillea albida Achillea lanulosa Achillea crassifolia Yarrow bloodwort Achillea dentifera Seven year's love Snake's grass Achillea cristata Thousand leaf Achillea eradiata Knight's milfoil Yarrow Knight's milefoil Millefoil Carpenter’s Weed Western yarrow Achillea setacea Achillea nabelekii Achillea arenicola Achillea submillefolium Thousand weed Yerw Achillea pecten-veneris Gearwe Milefolium Achillea gracilis Gordaldo Old man's pepper Achillea gigantea Achillea alpicola Thousand seal Hundred leaved grass Chamaemelum millefolium Achillea tenuifolia Achillea anethifolia Knyghten Achillea subalpina Achillea angustissima Little Feather Achillea marginata Achillea intermedia Achillea puberula Chamaemelum tomentosum Achillios millefoliatus Plumajillo Achillea rosea Fernweed Achillea magna Achillea pacifica Achillea occidentalis Achillea compacta Alitubus millefolium Yarrow milfoil Common yarrow Chamaemelum tanacetifolium Soldier’s Woundwort Thousand-leaf Achillea ceretanica Achillea coronopifolia YARROW Achillea ochroleuca Field hops Old Man's Pepper Achillea pumila Achillea californica Death flower Achillea sordida Herb Militaris Common Yarrow Field Hop Achillea pseudo-tanacetifolia Achillea haenkeana Achillea sylvatica Soldier's Woundwort Achillea fusca Achillea Millefolium Devil's nettle Alitubus tomentosus Devil’s Nettle Soldier's woundwort Thousand Leaf Achillea borealis Achillea millefolium Yarroway Achillea pratensis Nosebleed plant Achillea tenuis Achillea tanacetifolia Death Flower Achillea palmeri Achillea laxiflora Snake’s Grass