STEBBINSOSERIS

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Stebbinsoseris comprises two allotetraploid species derived from hybrids between Microseris and Uropappus. The justification for raising these species to generic rank was given in R. K. Jansen et al. (1991b), where molecular data were presented supporting the separation of Uropappus from Microseris. Stebbinsoseris and Uropappus were ranked as sections of Microseris in earlier taxonomic treatments (K. L. Chambers 1955, 1960). Because of its hybrid origin, Stebbinsoseris is intermediate in critical taxonomic traits of habit, involucre, and fruits (C. Irmler et al. 1982), and it is separated from its parental taxa by rather minor differences. Chloroplast DNA studies show that Microseris douglasii and M. bigelovii were the maternal parents of the tetraploid hybrids (R. S. Wallace and R. K. Jansen 1990). That Uropappus lindleyi was the staminate parent of those crosses is confirmed by nuclear rDNA evidence reported by Wallace and Jansen (1995).

Facts about "STEBBINSOSERIS"
apex relieferose +
apex shapeacute + and notched +
arista architecturebarbellulate +
arista height or lengthshorter +
base architectureclasping +
blade shapelinear + and oblanceolate +
body coursestraight +
body course or shapearcuate +
body external textureglabrous +
body shapelanceolate +
bractlet shapedeltate +, ovate + and lanceolate +
chromosome count18 +
corolla colorationyellow +, white + and purplish +
corolla positionouter +
cypsela colorationbrown +, gray +, stramineous + and violet +
cypsela patternpurple-spotted +
cypsela shapecolumnar +, truncate-fusiform + and beaked +
face external textureglabrous +, scurfy-puberulent +, on outer . + and strigose +
head arrangementsingly +
involucre shapecampanulate +, fusiform + and ovoid +
leaf architecturepetiolate +
leaf positionbasal +
lobe coursestraight + and arcuate +
lobe shapeacute +
lobe widthnarrow +
margin shapeentire +, dentate +, lobed +, plane + and involute +
pappus durationpersistent +
peduncle architectureebracteate +
peduncle external textureglabrous + and scurfy-puberulent +
peduncle shapeinflated +
petiole external texturescurfy-puberulent +
petiole shapeattenuate +
phyllary colorationgreen + and purple +
phyllary external texture or internal textureherbaceous +
phyllary shapelanceolate +
phyllary sizesubequal +
phyllary variabilityequal +
receptacle architectureepaleate +
receptacle external textureglabrous +
receptacle prominence or shapeflat +
receptacle reliefpitted +
rib count10 +
rib reliefscabrellous + and spiculate +
scale colorationyellowish +, brownish + and white +
scale count5 +
scale shapearistate +
series count2 +
stem architectureunbranched +
stem count0 +
stem external textureglabrous + and scurfy-puberulent +
stem orientationerect +
tooth coursestraight + and arcuate +
tooth shapeacute +
tooth widthnarrow +
whole organism architecturetaprooted +
whole organism life styleannual +