Taraxacum laurentianum

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Though very similar to Taraxacum ceratophorum, this Gulf of St. Lawrence endemic stands out by its statistically significantly larger heads and other parts (L. Brouillet, unpubl. data). It also occupies a habitat atypical of normal T. ceratophorum in the area. It is possible that the species is under threat from its introduced congener T. officinale, and from human activities in its fragile, easily disturbed coastal habitat.

apex shapeobtuse +, to short-acuminate +, horned +, long-acuminate + and tapered +
base shapecuneate + and attenuate +
beak sizeslender +
blade shapeoblanceolate + and runcinate +
body shapeoblanceoloid + and obovoid +
calyculus colorationgreenish + and purplish +
calyculus external texture or internal textureherbaceous +
calyculus orientationascending +, spreading + and recurving +
calyculus shapelanceolate + and ovate +
chromosome count40 +
cone shapeconic +
corolla colorationyellow +, gray-striped + and purplish +
cypsela colorationgrayish-olivaceous +, tan + and straw +
face architecture or external texture or reliefsmooth +
face densitydenser +
face external texturepilose +, glabrate + and glabrous +
face relieftuberculate + and muricate +
flowering timesummer +
habitatcalcareous +, seashore meadows and gravelly seashores ( coastal ) +, turfy areas of seaside taluses + and sandy riverside meadows in boreal forest zone +
involucre colorationgreen +
involucre shapecampanulate +
leaf architecturesessile + and winged-petiolate +
leaf life stageyounger +
leaf orientationerect + and patent +
margin colorationhyaline + and purplish +
margin external texturescarious + and outer . +
margin shapelobed + and toothed +
pappus colorationcreamy +
phyllary shapelanceolate + and ovate-lanceolate +
rib count14 +
rib width5 + and narrow +
series count2 +
stem colorationpurplish +
stem external textureglabrate + and villous +
stem orientationerect + and ascending +
taproot architecturebranched +
tip colorationpurplish + and black +
tip external texturescarious +
tip relieferose +
tooth architecturelobelike +
tooth developmentdeveloped +
tooth orientationretrorse + and antrorse +
tooth shapelanceolate +, triangular +, deltate + and acuminate +
tooth sizelarger +
whole organism life styleplant +