Symphyotrichum undulatum (formerly Aster undulatus) is a species of flowering plant in the family Asteraceae native to eastern North America. Commonly known as wavyleaf aster,[3] it is a perennial, herbaceous plant that flowers August through October and may reach heights between 30 and 160 centimeters (1 and 5 feet).

Symphyotrichum undulatum
Conservation status
Secure  (NatureServe)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Astereae
Subtribe:	Symphyotrichinae
Genus:	Symphyotrichum
Subgenus:	Symphyotrichum subg. Symphyotrichum
Section:	Symphyotrichum sect. Symphyotrichum
Species:	S. undulatum
Binomial name
Symphyotrichum undulatum (L.) G.L.Nesom[2]
Native distribution[2]
Synonyms[2]
Basionym Aster undulatus L. Alphabetical list Aster asperifolius E.S.Burgess Aster asperulus Torr. & A.Gray Aster autumnalis Wender. ex Nees Aster baldwinii Torr. & A.Gray Aster claviger E.S.Burgess Aster corrigiatus E.S.Burgess Aster diversifolius Michx. Aster gracilescens E.S.Burgess Aster heteromallus Wender. Aster linguiformis E.S.Burgess Aster loriformis (E.S.Burgess) E.S.Burgess Aster mohrii E.S.Burgess Aster paniculatus Nutt. Aster proteus E.S.Burgess Aster sagittifolius Elliott Aster scaber Elliott Aster sylvestris E.S.Burgess Aster triangularis E.S.Burgess Aster truellius E.S.Burgess Aster undulatus var. abruptifolius E.S.Burgess Aster undulatus var. asperulus Alph.Wood Aster undulatus var. diversifolius (Michx.) A.Gray Aster undulatus var. loriformis E.S.Burgess Aster undulatus var. sylvestris Howe Aster undulatus var. torquatus E.S.Burgess Aster undulatus var. triangularis E.S.Burgess

Description

Symphyotrichum undulatum is a perennial, herbaceous plant that flowers from August through October, growing to heights between 30 and 160 centimeters (1 and 5 feet) from a cespitose rootstock. The roots can have short rhizomes or branched and woody caudices.[3]

Its flowers have blue to purple, or sometimes lilac, ray florets and cream or light yellow, then purple, disk florets.[3]

Fruit

The fruits (seeds) of Symphyotrichum undulatum are not true achenes but are cypselae, resembling an achene but surrounded by a calyx sheath. This is true for all members of the Asteraceae family.[4] After pollination, they become dull purple to light brown or tan with an oblong-obovoid compressed shape, 1.7–2.2 mm[lower-alpha 1] in length with 3–4 nerves, and with a few stiff, slender bristles on the surface (strigillose). They also have tufts of hairs (pappi) which are cream or rose-tinged and 3.5–5 mm in length.[3]

Chromosomes

The species has a monoploid number (also called base number) of eight chromosomes (x = 8). Individual plants with 16 and 32 sets of its chromosomes have been found, meaning the species is diploid and tetraploid.[3]

Conservation

As of October 2022^[update], NatureServe listed S. undulatum as Secure (G5) globally; Secure (S5) in New Jersey, New York, North Carolina, and West Virginia; Apparently Secure (S4) in Virginia; Vulnerable (S3) in Indiana and Nova Scotia; and, Critically Imperiled (S1) in Illinois. The species' global status was last reviewed on 25 July 2016.[1]

Notes

Citations

References