PLECTOCEPHALUS

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Molecular phylogenetic studies have been informative regarding the relationships of members of Cynareae, Centaureinae. Centaurea as traditionally recognized is polyphyletic. Plectocephalus is part of the basal grade in Centaureinae and is not closely related to Centaurea in a narrow sense (A. Susanna et al. 1995). Morphologically Plectocephalus is difficult to separate from the more derived and highly diverse Centaurea. Plectocephalus cypselae have obliquely basal attachment scars and the hilum of the seeds is basal. Centaurea cypselae have lateral attachment scars and hilum of the seed is lateral. The ovaries of Plectocephalus initially have 2-celled hairs; these may be absent from mature cypselae. Centaurea produces only 1-celled hairs on ovaries.

Facts about "PLECTOCEPHALUS"
apex sizeexpanded +
appendage orientationerect + and spreading +
appendage shapetriangular +, fringed + and oblong +
array architectureopen + and cymiform +
base shapetailed +
body arrangement or shapelinear +
body orientationappressed +
body shapeentire +
bristle architecture or shapebarbed +
bristle external texturestiff +
chromosome count13 +
corolla architecturezygomorphic + and actinomorphic +
corolla colorationpink +, purple +, cream + and yellow +
corolla positioninner +
corolla reproductionfertile +
corolla shapeelongate + and bent +
corolla sizeexpanded +
face external texturepuberulent +
face patternglandular-punctate +
floret architectureneuter +
floret countmany +
floret positionperipheral +
hair architecture2-celled +
head architecture or arrangementradiant +
head arrangementsingly + and in open cymiform arrays +
involucre shapeovoid +, hemispheric + and campanulate +
leaf architecturepetiolate + and sessile +
leaf positionbasal + and cauline +
lobe arrangement or shapelinear +
margin shapeentire + and dentate +
node external texturehairy +
pappus behaviourfalling +
peduncle shapefistulose +
phyllary countmany +
phyllary sizeunequal +
phyllary widthnarrow +
portion fusiondistinct +
portion sizeminute +
receptacle architectureepaleate +
receptacle external texturebristly +
receptacle prominence or shapeflat +
scar architecture or shaperibbed +
scar external textureglabrous + and puberulent +
scar shapeoblique +, obovoid +, barrel-shaped + and compressed +
stem architecturebranched +
stem orientationerect +
throat shapecylindric +
tube shapeelongate +
tube sizeslender +
whole organism architecture or shapespiny +
whole organism life styleannual +