Prenanthes trifoliolata

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Prenanthes trifoliolata is recognized by its relatively large, palmately 3–5-lobed leaves with angular lobes and sinuses, basally attenuate involucres, dark green and glabrous calyculi and phyllaries, and pale yellow corollas. Dwarf plants with deeply parted leaves found in alpine areas of northern New England and Canada have been recognized as P. nana or P. trifoliolata var. nana. This form is probably no more than a phenotypic adaptation to harsh environments. In at least some localities, it intergrades with more typical P. trifoliolata at lower elevations.

array architectureracemiform + and paniculiform +
base shapecordate + and rounded +
blade shapedeltate + and ovate +
blade widththin +
bractlet colorationgreen + and blackish +
bractlet shapetriangular +
calyculus external textureglabrous +
chromosome count16 +
cluster architecture or courseirregular +
corolla colorationyellow +
cypsela architecture or shape8-11-ribbed +
cypsela colorationtan + and brown +
cypsela shapesubcylindric +, subterete + and angled +
face architecture or shapeciliate +
face external textureglabrous +
face positiondistal +
face shapelobed + and entire +
face sizereduced +
flowering timeaugsep + and oct +
habitatmoist oak-hickory woods +, swampy thickets +, sandy areas +, cliffs + and saline habitats +
habitat inclinesloped +
habitat moisturewet +
head orientationnodding +
involucre shapecampanulate +
leaf architecturepetiolate +
leaf countpresent +
leaf other or positionproximal +
lobe arrangement or shapeangular +
lobe height or lengthshort +
lobe shaperounded + and lanceolate +
margin architecturecompound +
margin architecture or shapeciliate +
margin external texturescarious +
margin shape3-5-lobed-to-divided + and serrate +
pappus colorationyellow +
peduncle architecturebracteate +
petiole architecturewinged +
phyllary colorationgreen + and blackish +
phyllary shapelanceolate + and elliptic +
sinus arrangement or shapeangular +
sinus shaperounded +
stem colorationgreen + and purple +
stem external textureglabrous + and tomentulose +
stem orientationerect +
taproot widththick +
whole organism life styleplant +