Prenanthes serpentaria

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Prenanthes serpentaria is generally recognized by its large, deeply 3–5-lobed proximal leaves with rounded sinuses and lobes, winged petioles, attenuate involucres, sparsely setose phyllaries, and yellow corollas. The leaves are variable in size and lobing, often on the same plant. Some specimens have predominantly ovate to elliptic, unlobed leaves, and these have been variously recognized. Some specimens appear to combine characteristics of P. crepidinea or P. trifoliolata and may be the result of recent or ancient hybridization. The species boundaries in this group merit further study.

apex shapeacute + and obtuse +
array architecturepaniculiform +, corymbiform + and branching +
array shapeelongate +
array widthbroad +
blade external texture or internal texturecoriaceous +
blade shapedeltate +, ovate + and elliptic +
bractlet colorationgreen + and purple +
bractlet shapetriangular + and subulate +
calyculus external texturetomentulose + and setose +
chromosome count16 +
cluster orientationnodding +
corolla colorationyellow +
cypsela architecture or shape8-10-ribbed +
cypsela colorationbrown + and tan +
cypsela shapesubcylindric +, subterete + and angled +
face architecturecauline + and petiolate +
face external textureglabrous + and tomentose +
face positiondistal +
face shapelobing + and entire +
face sizereduced +
flowering timeaugsep + and oct +
habitatoak-hickory woodlands +, borders +, oak flats +, pine woods + and sandy areas +
habitat inclineflat +
involucre shapecylindric + and attenuate +
leaf architecturepetiolate +
leaf conditionwithered +
leaf other or positionproximal +
lobe shaperounded + and divided +
lobe sizelarge +
margin shape3-5-lobed +, entire + and dentate +
pappus colorationtan +
peduncle architecturebracteate +
phyllary atypical count10 +
phyllary colorationgreen + and purple +
phyllary external texturehispid + and setose +
phyllary orientationto appressed +
phyllary shapelanceolate + and elliptic +
root positionlateral +
seta colorationgreen + and tan +
seta countsingle +
seta external texturecoarse +
seta orientationappressed +
sinus shaperounded + and divided +
sinus sizelarge +
stem colorationgreen +, reddish + and mottled +
stem external textureglabrous + and tomentulose +
stem orientationerect +
taproot height or lengthshort +
taproot widththick +
whole organism life styleplant +