Ageratina, commonly known as snakeroot, is a genus of more than 330 perennials and rounded shrubs in the family Asteraceae. These plants grow mainly in the warmer regions of the Americas and West Indies. Over 150 species are native to Mexico. Some flourish in the cooler areas of the eastern United States. Two Mexican species have become a pest in parts of Australia and Taiwan. Ageratina used to belong to the genus Eupatorium, but it has been reclassified. The genus name Ageratina means "like Ageratum" and consists of Ageratum and -ina, the feminine form of the Latin adjectival suffix . Description The inflorescence consists of multiple fluffy, red or pinkish-white capitula in clusters. These lack the typical ray flowers of the composites. They have multiple, much-branched woody stems. The petioles are rather long. The leaves are triangular, serrate and opposite with a foul-smelling, musky scent. Species , Plants of the World online has 322 accepted species: Ageratina acevedoana Ageratina acevedoi Ageratina adenophora Ageratina adenophoroides Ageratina aegirophylla Ageratina alexanderi Ageratina allenii Ageratina altissima Ageratina amblyolepis Ageratina ampla Ageratina anchistea Ageratina angustifolia Ageratina anisochroma Ageratina apollinairei Ageratina appendiculata Ageratina aracaiensis Ageratina arbutifolia Ageratina areolaris Ageratina aristeguietii Ageratina aristei Ageratina aromatica Ageratina arsenei Ageratina asclepiadea Ageratina astellera Ageratina atrocordata Ageratina austin-smithii Ageratina ayerscottiana Ageratina baccharoides Ageratina badia Ageratina barbensis Ageratina barclayae Ageratina barriei Ageratina beamanii Ageratina bellidifolia Ageratina bishopii Ageratina blepharilepis Ageratina bobjansenii Ageratina boekei Ageratina boyacensis Ageratina brandegeana Ageratina brevipes Ageratina burgeri Ageratina caeciliae Ageratina calaminthifolia Ageratina calophylla Ageratina campii Ageratina campylocladia Ageratina capazica Ageratina capillipes Ageratina cardiophylla Ageratina carmonis Ageratina cartagoensis Ageratina cerifera Ageratina chachapoyasensis Ageratina chazaroana Ageratina chimalapana Ageratina chiriquensis Ageratina choricephala Ageratina choricephaloides Ageratina colimana Ageratina collodes Ageratina concordiana Ageratina contigua Ageratina contorta Ageratina corylifolia Ageratina costaricensis Ageratina crassiceps Ageratina crassiramea Ageratina cremastra Ageratina croatii Ageratina cronquistii Ageratina cruzii Ageratina cuatrecasasii Ageratina cuencana Ageratina cuicatlana Ageratina cumbensis Ageratina cutervensis Ageratina cuzcoensis Ageratina cylindrica Ageratina dasyneura Ageratina davidsei Ageratina deltoidea Ageratina desquamans Ageratina dictyoneura Ageratina dillonii Ageratina diversipila Ageratina dolichobasis Ageratina dombeyana Ageratina dorrii Ageratina elegans Ageratina enixa Ageratina espinosarum Ageratina etlana Ageratina etlensis Ageratina ewanii Ageratina fastigiata Ageratina feuereri Ageratina flaviseta Ageratina fleischmannioides Ageratina flourensifolia Ageratina funckii Ageratina geminata Ageratina gentryana Ageratina gilbertii Ageratina glabrata Ageratina glandulifera Ageratina glauca Ageratina glechonophylla Ageratina glischra Ageratina gloeoclada Ageratina glyptophlebia Ageratina gonzalezorum Ageratina gracilenta Ageratina gracilis Ageratina grandifolia Ageratina grashoffii Ageratina guatemalensis Ageratina gynoxoides Ageratina gypsophila Ageratina haageana Ageratina halbertiana Ageratina harlingii