Family: Asteraceae
Merel R. Black
Leaves petiolate, leaf bases cordate
Leaf margins entire
All leaves w/ petioles S. shortii
Only lower leaves w/ petioles, becoming clasping above S. oolentangiense
Leaf margins toothed
Petioles of mid stem leaves unwinged or with narrow wings S. cordifolium
Petioles of mid stem leaves prominently winged
Upper stems and leaves evenly & densely hairy, leaves sand papery S. drummondii
Upper stems and leaves glabrous or hairs in lines only
Inflorescence white S. urophyllum
Inflorescence blue S. ciliolatum
Leaves sessile, leaf bases clasping/auriculate
Leaf margins toothed S. prenanthoides
Leaf margins entire
Stems and leaves glabrous S. laeve
Stems and leaves at least sparsely hairy
Glandular hairs mixed with non glandular hairs toward inflorescence S. novae-angliae
No glandular hairs
Stems evenly hairy S. puniceum
Stems with hairs in lines S. firmum
Leaves sessile, leaf bases not clasping/auriculate
Inflorescence blue
Leaves silvery w/ silky hairs S. sericeum
Leaves not silvery
Upper stem glandular S. oblongifolium
Upper stem not glandular S. praealtum
Inflorescence white
Phyllaries with spiny tip
Phyllaries hairy S. ericoides
Phyllaries glabrous S. pilosum
Phyllaries without spiny tip
Slender stem, leaves linear-lanceolate and with inrolled margins,
limited to high quality wetlands S. boreale
Stout stems, lanceolate or oblanceolate leaves w/out inrolled margins,
common across state
Underside of leaf glabrous S. lanceolatum
Underside of leaf hairy at least on midrib
Underside of leaf hairy on midrib S. lateriflorum
Underside of leaf evenly hairy S. ontarionis
Leaf margins entire
All leaves w/ petioles S. shortii
Only lower leaves w/ petioles, becoming clasping above S. oolentangiense
Leaf margins toothed
Petioles of mid stem leaves unwinged or with narrow wings S. cordifolium
Petioles of mid stem leaves prominently winged
Upper stems and leaves evenly & densely hairy, leaves sand papery S. drummondii
Upper stems and leaves glabrous or hairs in lines only
Inflorescence white S. urophyllum
Inflorescence blue S. ciliolatum
Leaves sessile, leaf bases clasping/auriculate
Leaf margins toothed S. prenanthoides
Leaf margins entire
Stems and leaves glabrous S. laeve
Stems and leaves at least sparsely hairy
Glandular hairs mixed with non glandular hairs toward inflorescence S. novae-angliae
No glandular hairs
Stems evenly hairy S. puniceum
Stems with hairs in lines S. firmum
Leaves sessile, leaf bases not clasping/auriculate
Inflorescence blue
Leaves silvery w/ silky hairs S. sericeum
Leaves not silvery
Upper stem glandular S. oblongifolium
Upper stem not glandular S. praealtum
Inflorescence white
Phyllaries with spiny tip
Phyllaries hairy S. ericoides
Phyllaries glabrous S. pilosum
Phyllaries without spiny tip
Slender stem, leaves linear-lanceolate and with inrolled margins,
limited to high quality wetlands S. boreale
Stout stems, lanceolate or oblanceolate leaves w/out inrolled margins,
common across state
Underside of leaf glabrous S. lanceolatum
Underside of leaf hairy at least on midrib
Underside of leaf hairy on midrib S. lateriflorum
Underside of leaf evenly hairy S. ontarionis
