PRENANTHELLA

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The single species of Prenanthella was usually assigned to Lygodesmia in treatments prior to A. S. Tomb’s (1972b) reassessment. Its base chromosome number of x = 7 was taken as evidence of a possible relationship with Malacothrix, Calycoseris, and Anisocoma, also x = 7 (Tomb 1974). Recent molecular phylogenetic studies (J. Lee et al. 2003) place Prenanthella in a clade with Pleiacanthus, Stephanomeria, and Rafinesquia, all with x = 8. This group, together with Munzothamnus, constitutes the subtribe Stephanomeriinae of Lee and B. G. Baldwin (2004).

Facts about "PRENANTHELLA"
apex shapeacute +
array architecturepaniculiform +
axis architecturebracteate + and intricately-branched +
axis courseflexuous +
blade shapespatulate +, oblanceolate + and runcinate +
bractlet shapedeltate +
bractlet sizeminute + and unequal +
bristle architecture or external texture or reliefsmooth +
bristle colorationwhite +
bristle external texturestiff +
bristle fusionconnate +
bristle sizeunequal +
chromosome count7 +
corolla colorationpink + and white +
cypsela architecturegrooved +
cypsela architecture or shape5-ribbed +
cypsela colorationbrown +
cypsela external textureglabrous +
cypsela reliefrugulose +
cypsela shapecolumnar +, tapering + and beaked +
face external textureglabrous +
involucre shapeovoid + and cylindric +
leaf architecturesessile + and petiolate +
leaf positionbasal + and cauline +
margin colorationhyaline +
margin shapedentate + and lobed +
pappus behaviourfalling +
peduncle architecturebracteate +
peduncle shapeinflated +
phyllary external texture or internal textureherbaceous +
phyllary shapelinear-lanceolate +
phyllary variabilityequal +
receptacle architectureepaleate +
receptacle architecture or external texture or reliefsmooth +
receptacle external textureglabrous +
receptacle prominence or shapeflat +
series count1 +
stem architectureleafy + and branched +
stem courseflexuous +
stem external textureglandular-puberulent + and glabrescent +
stem orientationerect +
tooth architecture or shapespinulose +
whole organism architecturetaprooted +
whole organism life styleannual +