Symphyotrichum porteri

(A. Gray) G. L. Nesom

Phytologia 77: 289. 1995.

Common names: Porter’s or smooth white aster
Basionym: Aster porteri A. Gray Notes Compositae, 99. 1880
Synonyms: Aster ericoides var. strictus Porter
Treatment appears in FNA Volume 20. Treatment on page 513. Mentioned on page 468, 500.

Perennials, 10–50 cm, cespitose; usually with branched caudices, sometimes long-rhizomatous. Stems 1–4+, ascending to erect (straight), glabrous. Leaves thin, margins usually entire, sometimes very sparsely serrulate distally, scabrous, apices acute, mucronulate, faces glabrous; basal usually deciduous at flowering (new winter rosettes developed by flowering), petiolate (petioles narrow or ± winged, then appearing sessile, slightly sheathing, ciliate), blades oblanceolate to obovate or spatulate, 5–45+ × 2–6 mm, cuneate, apices obtuse; proximal cauline usually withering by flowering, petiolate or sessile (petioles winged, slightly clasping, ciliate), blades oblanceolate or lanceolate to linear-oblanceolate or -lanceolate, 40–80(–90) × 2–5(–6) mm, bases cuneate; distal sessile, blades linear-lanceolate to linear, ± falcate, 8–60 × 0.5–3 mm, reduced distally, bases cuneate to rounded-cuneate. Heads in paniculiform arrays, branches ascending, ± densely leafy with narrow branch leaves. Peduncles 0.2–2.8 cm, bracteate, glabrous, bracts 1–3, linear to linear-lanceolate. Involucres campanulate to cylindro-campanulate, 3.6–5(–6) mm. Phyllaries in 4–6 series, linear-lanceolate to -oblanceolate (outer) or oblong-lanceolate (inner), unequal, bases indurate 1/4–3/4 (sometimes outermost foliaceous), margins proximally narrowly scarious, erose, hyaline, distally ciliolate, green zones lanceolate, apices acute, ± spreading, involute, mucronulate, faces glabrous. Ray florets (12–)20–34(–42); corollas usually white, seldom pinkish, laminae 6.8–12 × 0.7–1.8 mm. Disc florets (30–)40–75(–103); corollas pale yellow becoming pink and later brown, (2.8–)3.1–3.9(–4.9) mm, tubes much shorter than narrowly funnelform throats, lobes triangular, (0.3–)0.5–0.7(–0.8) mm. Cypselae purple to stramineous, obovoid to oblanceoloid, compressed, 1–2 mm, 4–5-nerved, faces sparsely, finely strigillose; pappi white, 1.2–3.5 mm. 2n = 16.

Phenology: Flowering late Jul–Sep.
Habitat: Lower montane
Elevation: 1800–2900 m


Symphyotrichum porteri is the only western member of subsect. Porteriana; it grows in the foothills of the Rocky Mountains.

Selected References


Lower Taxa

... more about "Symphyotrichum porteri"
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(A. Gray) G. L. Nesom +
Aster porteri +
Porter’s or smooth white aster +
Colo. +, N.Mex. +  and Wyo. +
1800–2900 m +
Lower montane +
Flowering late Jul–Sep. +
Aster ericoides var. strictus +
Symphyotrichum porteri +
Symphyotrichum sect. Symphyotrichum +
species +