Symphyotrichum sericeum is a species of flowering plant in the family Asteraceae native to central North America. Commonly known as western silver aster, western silvery aster, and silky aster, it is a perennial, herbaceous plant that may reach 70 centimeters tall. Its flowers have purple ray florets and pink then purple disk florets, and its leaves are firm and silvery-green.
Symphyotrichum frondosum is a species of flowering plant in the family Asteraceae native to western North America. Commonly known as short-rayed alkali aster, it is an annual or perennial herbaceous plant that may reach 140 centimeters tall.
Symphyotrichum ciliatus is a species of flowering plant in the family Asteraceae native to North America and eastern Eurasia. Commonly known as rayless annual aster and rayless alkali aster, it is an annual, herbaceous plant that may reach over 70 centimeters tall. Each flower head has many whitish then pink disk florets and no ray florets ("rayless").
Symphyotrichum plumosum is a species of flowering plant in the family Asteraceae endemic to Florida in the United States. Commonly known as plumose aster, it is a perennial, herbaceous plant that may reach 40 to 100 centimeters tall. Its flowers have rose-purple ray florets and yellow turning to purple disk florets. It is of conservation concern.
Symphyotrichum anticostense is a species of flowering plant in the family Asteraceae endemic to Quebec, New Brunswick, and Maine. Commonly known as Anticosti aster, it is a perennial, herbaceous plant that may reach 10 to 90 centimetres tall. Its flowers have pale purple or lilac, sometimes white, ray florets and yellow, then reddish purple, disk florets.
Symphyotrichum 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 10 to 50 centimeters tall. Its flowers have white, rarely pinkish, ray florets and yellow, becoming pink then brown, disk florets. S. porteri grows at elevations of 1,800–2,900 meters. Its limited range makes it a NatureServe Vulnerable (G3) species, and it is classified Critically Imperiled (S1) in Wyoming.
Symphyotrichum foliaceum is a species of flowering plant in the family Asteraceae native to western North America. Commonly known as leafy aster, leafy-bracted aster, and alpine leafybract aster, it is a perennial, herbaceous plant that may reach 10 to 60 centimeters in height. Its flowers have violet to purple ray florets and yellow disk florets. Four varieties were accepted as of July 2021 by Plants of the World Online (POWO), as follows: S. foliaceum var. apricum, S. foliaceum var. canbyi, S. foliaceum var. cusickii, and S. foliaceum var. parryi. The autonym is S. foliaceum var. foliaceum.
Symphyotrichum retroflexum is a species of flowering plant in the family Asteraceae native to the southeastern United States. Commonly known as rigid whitetop aster, it is a perennial, herbaceous plant that may reach 40 to 100 centimeters tall. Its flowers have blue to purple ray florets and cream to pale yellow then pinkish disk florets. It is known only from the Blue Ridge Mountains in Alabama, Georgia, North Carolina, South Carolina, Tennessee, and Virginia, where it grows in wooded areas at elevations of 400–1,500 meters. As of September 2021, NatureServe classified it as Apparently Secure (G4); however, it had been reviewed last in 1994 and is marked as "needs review." There is an introduced presence of S. retroflexum in southeast China.
Symphyotrichum concolor is a species of flowering plant in the family Asteraceae native to the Atlantic coastal plain and Piedmont areas of the eastern United States, as well as the Bahamas. Commonly known as eastern silvery aster, it is a perennial, herbaceous plant that may reach 30 to 80 centimeters in height. Leaves are a grayish-green and have a silky look and feel. The flowers have 8–12 rose-purple, rarely white, ray florets, and pink then purple disk florets.
Symphyotrichum pratense is a species of flowering plant in the family Asteraceae native to the southeastern United States. Commonly known as barrens silky aster, it is a perennial, herbaceous plant that may reach 40 to 60 centimeters tall. Its flowers have rose-purple ray florets and pink then purple disk florets.
Symphyotrichum fendleri is a species of flowering plant in the family Asteraceae native to the mid- and south-central United States, including Great Plains states and extending into Texas and New Mexico. Commonly known as Fendler's aster, it is a perennial, herbaceous plant that may reach 6 to 30 centimeters tall. Its flowers have lavender to purple ray florets and yellow then reddish purple disk florets.
Symphyotrichum undulatum is a species of flowering plant in the family Asteraceae native to eastern North America. Commonly known as wavyleaf aster, it is a perennial, herbaceous plant that may reach 30 to 60 centimeters tall. Its flowers have blue to purple, or sometimes lilac, ray florets and cream or light yellow, then purple, disk florets.
Symphyotrichum hendersonii is a species of flowering plant in the family Asteraceae native to the northwestern United States. Commonly known as Henderson's aster, it is a perennial, herbaceous plant that may reach 70 to 150 centimeters tall. Its flowers have purple ray florets and yellow disk florets.
Symphyotrichum spathulatum is a species of flowering plant in the family Asteraceae native to western North America including northwestern Mexico. Commonly known as western mountain aster, it is a perennial, herbaceous plant that may reach 20 to 80 centimeters tall. Its flowers, which open in July and August, have violet ray florets and yellow disk florets.
Symphyotrichum subspicatum is a species of flowering plant in the family Asteraceae native to western North America. Commonly known as Douglas’s aster, it is a perennial, herbaceous plant that may reach 40 to 120 centimeters tall. Its flowers have violet ray florets and yellow then reddish disk florets.
Symphyotrichum phlogifolium is a species of flowering plant in the family Asteraceae native to the eastern United States. Commonly known as thin-leaf late purple aster, it is a perennial, herbaceous plant that may reach 50 to 130 centimeters tall. Its flowers have light to dark reddish-purple ray florets and white disk florets with purple triangular lobes.
Symphyotrichum adnatum is a species of flowering plant in the family Asteraceae native to the southeastern United States and the Bahamas. Commonly known as scaleleaf aster, it is a perennial, herbaceous plant that may reach 30 to 120 centimeters tall. Its flowers have lavender ray florets and yellow disk florets.
Symphyotrichum walteri is a species of flowering plant in the family Asteraceae native to the southeastern United States. Commonly known as Walter's aster, it is a perennial, herbaceous plant that may reach 20 to 100 centimeters tall. Its flowers have bluish-purple ray florets and yellow disk florets.
Symphyotrichum eulae is a species of flowering plant in the family Asteraceae endemic to Texas. Commonly known as Eula's aster, it is a perennial, herbaceous plant that may reach 5 to 150 centimeters tall. Its flowers have white to lavender-pink ray florets and yellow then red to brown disk florets. It was named for Eula Whitehouse, American botanist, botanical illustrator, and plant collector.
Symphyotrichum priceae is a species of flowering plant in the family Asteraceae native to the southeastern United States, specifically Alabama, Georgia, Kentucky, and Tennessee. Commonly known as Price’s aster or lavender oldfield aster, it is a perennial, herbaceous plant that may reach 3 to 10 decimeters tall. Its flowers have blue-violet ray florets and yellow then brown disk florets.
