Symphyotrichum porteri

{{Short description|Species of flowering plant in family Asteraceae}}

{{Use dmy dates|date=July 2021}}

{{Use shortened footnotes|date=July 2021}}

{{Use American English|date=July 2021}}

{{Speciesbox

| image = Symphyotrichum porteri 158289794 (cropped).jpg

| image_caption = S. porteri, Larimer County, Colorado

| range_map = Symphyotrichum porteri distribution.png

| range_map_alt = Symphyotrichum porteri native distribution map: US — Colorado counties: Boulder, Douglas, El Paso, Gilpin, Jefferson, Larimer, Las Animas, and Teller; New Mexico counties: Harding and San Miguel; Wyoming counties: Albany, Carbon, and Laramie

| range_map_caption = Native distribution{{sfn|USDA |2014}}

| status = {{TNCStatus}}

| status_system = TNC

| status_ref = {{sfn|NatureServe|2021}}

| display_parents = 5

| genus = Symphyotrichum

| parent = Symphyotrichum sect. Symphyotrichum

| species = porteri

| authority = (A.Gray) G.L.Nesom{{sfn|POWO|2019}}

| synonyms_ref = {{sfn|POWO|2019}}

| synonyms =

• Aster ericoides var. strictus {{small|Porter}}
• Aster porteri {{small|A.Gray}}

}}

Symphyotrichum porteri (formerly Aster porteri) is a species of flowering plant in the family Asteraceae endemic to the foothills of the Rocky Mountains in the U.S. states of Wyoming, Colorado, and New Mexico. Commonly known as Porter's aster, it is a perennial, herbaceous plant that may reach {{convert|10|to|50|cm|in|0|abbr=off|sp=us}} tall. Its flowers have white, rarely pinkish, ray florets and yellow, becoming pink then brown, disk florets. S. porteri grows at elevations of {{convert|1800–2900|m|ft|-2|abbr=off|sp=us}}.{{sfn|Brouillet|Semple|Allen|Chambers|2006}} Its limited range makes it a NatureServe Vulnerable (G3) species, and it is classified Critically Imperiled (S1) in Wyoming.{{sfn|NatureServe|2021}}

File:Symphyotrichum porteri specimen.jpg