# Symphyotrichum eulae

Symphyotrichum eulae (formerly Aster eulae) is a species of flowering plant in the family Asteraceae endemic to Texas. The common names Eula's aster and Texas aster have been used. It is a perennial, herbaceous plant that may reach 5 to 150 centimeters (2 to 59 inches) in height. Its flowers have white to bluish or lavender-white ray florets and yellow then reddish to brown disk florets. It was named for Eula Whitehouse, American botanist, botanical illustrator, and plant collector.

## Description

S. eulae is a perennial, herbaceous plant that may reach heights between 5 and 150 centimeters (2 and 59 inches). It grows from a long and thick rhizome and forms colonies of plants that each have one to three or more erect, straight, and stout glabrous (hairless) stems. Its flowers have white to bluish or lavender-white ray florets and yellow then reddish to brown disk florets.

### Chromosomes

It has a monoploid number (also called base number) of eight chromosomes (x = 8). The species is hexaploid with six sets of the chromosomes for a total chromosome count of 48.

## Taxonomy
### Etymology

Symphyotrichum eulae was named by Shinners for Eula Whitehouse, American botanist, botanical illustrator, and plant collector. The common names Eula's aster and Texas aster have been used.

### Classification

Symphyotrichum eulae is classified in the subgenus Symphyotrichum, section Symphyotrichum, subsection Dumosi. It is one of the "bushy asters and relatives." Its basionym (original scientific name) is Aster eulae, and its name with author citations is Symphyotrichum eulae (Shinners) G.L.Nesom. Botanist Lloyd Herbert Shinners described the species in 1950, classifying it within the genus Aster.
* Symphyotrichum subg. Symphyotrichum sect. Conyzopsis$^{:271}$ S. ciliatum S. frondosum S. laurentianum sect. Occidentales$^{:271}$ S. chilense S. eatonii S. foliaceum S. greatae S. hallii S. hendersonii S. jessicae S. lentum S. molle S. spathulatum S. subspicatum sect. Turbinelli$^{:133}$ S. turbinellum sect. Symphyotrichum$^{:268}$ ssect. Dumosi$^{:269}$ S. boreale S. bullatum S. burgessii S. carnerosanum S. dumosum S. eulae S. lanceolatum S. lateriflorum S. leone S. nahanniense S. ontarionis S. praealtum S. racemosum S. schaffneri S. simmondsii S. tradescantii S. welshii ssect. Heterophylli$^{:133}$ ser. Concinni$^{:133}$   S. laeve S. oolentangiense ser. Cordifolii$^{:133}$   S. anomalum S. ciliolatum S. cordifolium S. drummondii S. shortii S. undulatum S. urophyllum ssect. Porteriani$^{:270}$ S. depauperatum S. kentuckiense S. parviceps S. pilosum S. porteri ssect. Symphyotrichum ser. Punicei$^{:133}$ S. elliottii S. firmum S. prenanthoides S. puniceum S. rhiannon ser. Symphyotrichum S. anticostense S. novi-belgii S. retroflexum S. robynsianum Cladogram references 1 2 3 4 5 Nesom, G.L. (September 1994). "Review of the Taxonomy of Aster sensu lato (Asteraceae: Astereae), Emphasizing the New World Species". Phytologia. 77 (3) (published 31 January 1995): 141–297. ISSN 0031-9430. Retrieved 23 August 2021 – via Biodiversity Heritage Library. 1 2 3 4 5 Semple, J.C.; Heard, S.B.; Brouillet, L. (2002). "Cultivated and Native Asters of Ontario (Compositae: Astereae)". University of Waterloo Biology Series. 41. Ontario: University of Waterloo: 1–134.

## Distribution and habitat

Symphyotrichum eulae is endemic to Texas. Shinners reported that it had been found in the Texas counties of Bexar, Calhoun, Cooke, Dallas, Denton, Hill, Hunt, Kaufman, Navarro, Rockwall, Tarrant, Wise, and Wood. In his 1950 protologue for the species, he said that it was "Common in north central Texas, from Hopkins and Wood west to Cooke and Wise counties; extending south to Bexar and Calhoun counties".
The species is found in semi-shaded clay or sandy clay soils at elevations up to 100 meters (330 feet).

## Conservation

As of January 2023, NatureServe listed Symphyotrichum eulae as Apparently Secure (G4) globally and the same (S4) in Texas. Data was provided by the Texas Parks and Wildlife Department Wildlife Diversity Branch. The global status of S. eulae was last reviewed by NatureServe on 1 February 1994.