Symphyotrichum porteri

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

Colo., N.Mex., Wyo.

Discussion

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

Selected References

None.

Lower Taxa