ACROPTILON

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In most American floristic literature Acroptilon has been included within Centaurea, from which it differs by the subbasal rather than lateral attachment scars on the cypselae and the absence of sterile outer florets. The chromosome base number x = 13 is higher than that in most species of Centaurea in the strict sense. Molecular phylogenetic studies of the relationships of Cynareae genera (A. Susanna et al. 1995) support the segregation of Acroptilon from Centaurea.

Facts about "ACROPTILON"
apex external texturescarious +
apex positioninner +
apex shapeobtuse +, acute +, lanceolate +, acuminate + and triangular +
appendage shapeoblong +
array architecturecorymbiform + and paniculiform +
base orientationappressed +
base shapeshort-tailed +
bristle shapeflattened +
chromosome count13 +
corolla colorationblue +, pink + and white +
cypsela architecture or external texture or reliefsmooth + and with indistinct ribs +
cypsela external textureglabrous +
cypsela shapeobovoid + and compressed +
face external texturetomentose +, glabrate + and puberulent +
face patternresin-gland-dotted +
head architectureleafy-bracted +, corymbiform + and paniculiform +
head architecture or shapediscoid +
involucre shapeovoid + and subspheric +
involucre sizeconstricted +
leaf architecturesessile + and petiolate +
leaf other or positionproximal cauline +
leaf positionbasal +
lobe arrangement or shapelinear +
margin shapedentate +, lobed +, distal + and entire +
node external texturehairy +
node shapeswollen +
pappus architecture or shapebarbed + and plumose +
pappus behaviourfalling +
pappus lengthlonger +
phyllary countmany +
phyllary shapeouter + and ovate +
portion fusiondistinct +
portion height or lengthshort +
portion reliefpapillate +
receptacle architectureepaleate +
receptacle prominence or shapeflat +
rib prominenceindistinct +
scale countmany +
scale shapesetiform +
scale sizeunequal +
scar positionsubbasal +
stem architecturebranched +
stem orientationerect +
throat sizeexpanded +
tube shapebent +
tube sizeslender +
whole organism architecture or shapespiny +
whole organism life styleperennial +