![]() ![]() There are two different varieties: Ageratina altissima var. ![]() The plant can spread either by the wind dispersal of its seeds or by rhizomes. The flowers are a clean white color and after blooming, small seeds with fluffy white tails are released to blow in the wind. ![]() ![]() Īt the end of the upper branches, flat-topped panicles or compound corymbs of white flower heads appear, measuring 5–15 centimetres (2–6 in) across. Leaves have sharply serrated margins and are up to 15 centimetres (6 in) long. The upper part of the plant has multiple branches, which usually appear in opposite pairs. Stems are smooth with opposite leaves spaced well apart, with each pair of leaves positioned at a 90-degree angle from the pair above and below ( decussate). Plants are upright or sometimes ascending, growing to 1.5 metres (4.9 ft) tall, producing single or multi-stemmed clumps in mid to late summer and fall. An older binomial name for this species is Eupatorium rugosum, but the genus Eupatorium has undergone taxonomic revision by botanists, and some species once included in it have been moved to other genera. 1798Īgeratina altissima, also known as white snakeroot, richweed, or white sanicle, is a poisonous perennial herb in the family Asteraceae, native to eastern and central North America.
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