Thinleaf Late Purple Aster

Perennials, 50–130 cm, cespitose; with short, thick, woody caudices, not rhizomatous. Stems 1, erect to arching, light to dark brown, soft-hairy, hairs ascending- to spreading- stipitate-glandular distally. Leaves (dark green) thin, almost membraneous; basal early deciduous, sessile or subpetiolate, blades spatulate to obovate, 80–140 × 20–30 mm, bases cuneate, margins entire to ± serrate, scabrous, apices acute; proximal cauline withering by flowering, sessile, blades panduriform, (20–)30–70(–110) × 10–30(–35) mm, bases auriculate-clasping, margins entire (flat), sparsely villoso-ciliate, apices acute, faces finely sparely villous or scabrous, stipitate-glandular; distal sessile, blades (rugose-veined when fresh) ovate to lanceolate, 75–125(–140) × 15–35(–40) mm, bases strongly cordate-clasping to auriculate-amplexicaul, margins entire (± undulate), apices acute, acuminate to merely mucronate, faces sparsely strigose, moderately so along veins, sparsely to moderately stipitate-glandular. Heads in crowded, paniculiform arrays, branches often initially patent then ascending. Peduncles short (less than 4 cm), strigose, stipitate-glandular, bracts linear-lanceolate, ascending-appressed, grading into phyllaries. Involucres cylindric, 5.5–7.5(–8) mm. Phyllaries in 4–6 series, linear-lanceolate, unequal, bases (tan) ± indurate in proximal ¹ / 3 – ¹ / 2 , margins hyaline, erose, distally scabro-ciliolate to ciliolate, green zones covering distal ¹ / 2 , apices outer obtuse to acute, inner acuminate, purplish, faces sparsely strigillose, usually moderately to densely stipitate-glandular, rarely sparsely so. Ray florets 9–17; corollas light to dark reddish purple, laminae 10–18(–20) × 1–3 mm. Disc florets 15–35; corollas white with purple lobes, 6–8 mm, lobes triangular, 1–1.5 mm. Cypselae dark brown to black, obovoid, not compressed, 2.5–4 mm, 7–10-nerved, faces densely strigose along ribs; pappi tan to tawny, sometimes slightly purplish-tinged, 6–8 mm. 2n = 20.

Aster phlogifolius Muhlenberg ex Willdenow, Sp. Pl. 3: 2034. 1803; Aster patens Aiton var. phlogifolius (Muhlenberg ex Willdenow) Nees; Virgulus patens (Aiton) Reveal & Keener var. phlogifolius (Muhlenberg ex Willdenow) Reveal & Keener

Symphyotrichum phlogifolium (formerly Aster phlogifolius) 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 heights between 50 and 130 centimeters (1+3⁄4 and 4+1⁄4 feet). Its flowers have light to dark reddish-purple ray florets and white disk florets with purple triangular lobes.

Symphyotrichum phlogifolium là một loài thực vật có hoa trong họ Cúc. Loài này được (Muhl. ex Willd.) G.L.Nesom miêu tả khoa học đầu tiên.