ARCTIUM

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At maturity the dry heads of Arctium species are readily caducous with the enclosed cypselae, and the hooked phyllary tips cling easily to fur or fabrics. Animal dispersal is a major factor in the spread of burdock species across North America. The burs are a major problem when they become entangled in the wool of sheep and fur of dogs and other animals.

Facts about "ARCTIUM"
apex architecture or shapehooked-spiny tipped +
apex arrangementradiating +
apex arrangement or shapelinear +
apex coursestraight +
apex orientationascending + and erect +
apex positioninner +
apex shapetipped +
appendage shapeovate +, obtuse + and acute +
array architectureleafy-bracted +, paniculiform + and corymbiform +
base orientationappressed +
base shapetailed +
branch orientationascending +
bristle countmany +
chromosome count18 +
corolla colorationpink + and purple +
corolla external textureglabrous + and glandular-puberulent +
cypsela architecture or shaperibbed +
cypsela external textureglabrous +
cypsela external texture or reliefrough +
cypsela shapeobovoid + and compressed +
face external texturetomentose +
face patternresin-gland-dotted +
head architecture or shapediscoid +
head shapespheric + and ovoid +
leaf architecturelong-petiolate +
leaf positionbasal + and cauline +
leaf sizesmaller +
lobe shapetriangular +
lobe variabilityequal +
margin shapeentire +, dentate +, lobed + and dissected +
pappus behaviourfalling +
peduncle count0 +
phyllary arrangement or shapelinear +
phyllary countmany +
phyllary positionouter + and mid +
portion fusiondistinct +
portion reliefhairy-ringed +
portion shapeoblong +, acute + and obtuse +
receptacle architectureepaleate +
receptacle prominence or shapeflat +
scale shapesubulate +
scar positionbasal +
stem architecturebranched +
stem orientationerect +
throat shapecampanulate +
tube shapeelongate +
whole organism architecture or shapespiny +
whole organism life stylebiennial + and perennial +
whole organism otherherbage +
whole organism reproductionmonocarpic +