''Gutierrezia serotina'' is a North American species of flowering plant in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

known by the common name late snakeweed. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

in the United States.SEINet, Arizona Chapter, Southwestern Biodiversity
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Description

''Gutierrezia serotina'' is a perennial herb or

subshrub A subshrub (Latin ''suffrutex'') or dwarf shrub is a short shrub, and is a woody plant. Prostrate shrub is a related term. "Subshrub" is often used interchangeably with "bush".Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Der ...

up to 30 cm (1 foot) in height. Leaves are very narrow, sometimes thread-like. At the end of each branch there is an

inflorescence An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed o ...

of one or a few

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 ...

. The heads are larger than for most of the species in the genus. The head contains 8-17 disc florets with 4-9 yellow ray florets around the edge.Flora of North America, ''Gutierrezia petradoria'' (S. L. Welsh & S. Goodrich) S. L. Welsh, 1983. Goldenrod snakeweed
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References

External links

USDA Plants Profile for ''Gutierrezia serotina'' (late snakeweed)Missouri Botanical Garden: photo of herbarium specimen collected in Arizona (1935)
— '' isotype of Gutierrezia serotina''. serotina Flora of Arizona Endemic flora of the United States Plants described in 1899 Taxa named by Edward Lee Greene Flora without expected TNC conservation status {{Astereae-stub