Symphyotrichum urophyllum (Lindl. ex DC.) G.L.Nesom  
Family: Asteraceae
arrow-leaved aster, white arrowleaf aster
[Aster cordifolius subsp. sagittifolius L., Aster cordifolius var. sagittifolius L., Aster hirtellus Lindl. ex DC., Aster sagittifolius Wedem. ex Willd., misapplied, Aster sagittifolius f. hirtellus "Wedem. ex Willd., misapplied", Aster sagittifolius var. glomerellus "Wedem. ex Willd., misapplied", Aster sagittifolius var. urophyllus "Wedem. ex Willd., misapplied", Aster urophyllus Lindl., Aster urophyllus var. glomerellus Lindl.]
Symphyotrichum urophyllum image
Mark Feider  
Etymology: Aster: from the Greek aster, "a star," describing the radiate heads of the flowers
Plants: erect, perennial, 1 1/2' - 4' tall forb; stems with the upper half usually densely hairy
Leaves: hairy below, shallowly-toothed, mostly oval to lance-like with heart-shaped bases on long winged stalks
Flowers: head 1"-1 1/2" wide with 10-20 blue rays, bracts (phyllaries) somewhat loose; inflorescence of many heads in conical, branched clusters
Habitat: clearings, open woods
- Leaf bases cordate,

- Leaf margins toothed

- Petioles prominently winged

- Leaves sparsely pubescent, not sand papery (vs. S. drummondii)

- Stems mostly hairless or hairs in lines (vs. S. drummondii)

- Rays white (vs. S. ciliolatum), discs yellow turning maroon

- Inflorescence narrow, branches ascending

- Most similar to S. ciliolatum
Symphyotrichum urophyllum image
Mark Feider  
Symphyotrichum urophyllum image
Mark Feider  
Symphyotrichum urophyllum image
Mark Feider  
Symphyotrichum urophyllum image
Mark Feider  
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