Symphyotrichum pilosum var. pringlei

Pringle's Aster, aster de Pringle

Symphyotrichum pilosum var. pringlei (A. Gray) G.L. Nesom is native to the northern portion of the range of S. pilosum.  It has hairless stems, leaves and heads (Brouillet et al. 2006 FNA).  Stem height is highly variable with the shortest plants growing on limestone alvars and taller plants growing in sandy soils.  The latter were described from southeastern Virginia as a Aster pilosum var. demotusbut the taxon should not be recognized.  Tall plants collected in the field can be very short when grown in limited soil.  Throughout the range the variety is hexaploid (2n=48; Semple and Chmielewski 1985).   Hexaploid plants of S. parviceps from eastern Missouri can be confused with glabrate forms of S. pilosum var. pringlei, but the taxon does not grow that far to the southwest.

Symphyotrichum pilosum var. pringlei, limestone pavement habitat, Bruce Penin., Ontario
Symphyotrichum pilosum var. pringlei, 2798. Bruce Penin., Ontario
Symphyotrichum pilosum var. pringlei, from Bruce Penin., cult. Waterloo ON
Symphyotrichum pilosum var. pringlei, head, Manitoulin Is., ON, cult WAT
Symphyotrichum pilosum var. pringlei, limestone pavement habitat, Bruce Penin., Ontario
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Symphyotrichum pilosum var. pringlei, 2798. Bruce Penin., Ontario
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Symphyotrichum pilosum var. pringlei, from Bruce Penin., cult. Waterloo ON
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Symphyotrichum pilosum var. pringlei, head, Manitoulin Is., ON, cult WAT
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1-4. Symphyotrichum pilosum var. pringlei. 1. limestone pavement habitat, Bruce Peninsula, Ontario. 2. Several small plants, Semple 2798, Bruce Peninsula, Ontario.  3. Very large cultivated from Bruce Penin., cult. in Waterloo, Ontario. 4. Head, note lack of numerous hairs, Manitoulin Is., Ontario.

Last updated 2 April 2025 by J.C. Semple

© 2025 J.C. Semple, including all photographs unless otherwise indicated