''Erigeron caespitosus '' is a
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...
n species of flowering plants in the family
Asteraceae known by the common name tufted fleabane. It is native to western
Canada (
Yukon,
British Columbia,
Alberta,
Saskatchewan,
Manitoba) and the
United States (
Alaska and mountains of the
western United States, primarily the
Rockies, as far south as
Arizona and
New Mexico)
''Erigeron caespitosus '' is a
perennial herb up to 30 cm (12 inches) tall, forming clumps over a
taproot and usually covered with stiff hairs. One plant will produce numerous
flower heads
A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...
in groups of 1–4 at the ends of upper branches. Each head contains as many as 100 white or blue
ray florets surrounding many small yellow
disc florets.
Flora of North America, ''Erigeron caespitosus'' Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 307. 1840. Tufted fleabane
/ref>
References
Plants described in 1840
caespitosus
Flora of Northern America
{{Erigeron-stub