MICROSERIS

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A broad circumscription of Microseris, including Apargidium and excluding Nothocalaïs,

   has usually been accepted (e.g., K. L. Chambers 1955, 1960). Recently, molecular data have led
   to reinstatement of the monotypic genus Uropappus and separation of two other species as the
   allotetraploid genus Stebbinsoseris (R. K. Jansen et al. 1991b; Chambers 1993c). A large body of
   literature has resulted from use of Microseris as a model genetic system by K. Bachmann and
   colleagues (e.g., Bachmann et al. 1979; Bachmann 1992; Bachmann and J. Battjes 1994).
   Differences in the diploid DNA amount within and between species have been studied by H. J.
   Price and colleagues (Price and Bachmann 1975; Price et al. 1981, 1983). Additional genetic
   studies, not referenced here, have involved three species from Australia, New Zealand, and
   Chile, widely disjunct from the main center of distribution in western North America. Ten of the
   species are diploid (2n = 18); the four tetraploid species (2n = 36) are of alloploid origin.
   The nine North American perennial taxa are closely related and mostly allopatric, occupying
   different habitats or climatic zones. The five annual species, which sometimes occur in
   sympatric clusters, are difficult to distinguish without the presence of cypselae.
Facts about "MICROSERIS"
apex shapeacuminate +, acute +, obtuse +, truncate + and lacerate +
arista architecturebarbellulate +, barbellate + and plumose +
blade shapelinear +, lanceolate + and oblanceolate +
body shapedeltate +, lanceolate +, oblong +, ovate +, orbiculate + and linear +
callosity shapeknoblike +
calyculus count0 +
chromosome count9 +
corolla colorationyellow +, orange +, white + and purplish +
corolla positionouter +
cypsela colorationgray +, brown + and purplish +
cypsela patternpurplish-spotted +
cypsela shapecolumnar +, obconic + and fusiform +
face external textureglabrous +, scurfy-puberulent +, black-villous +, white-strigillose + and villous +
head arrangementsingly +
involucre shapefusiform +, ovoid +, globose + and campanulate +
leaf architecturepetiolate +
leaf count0 +
leaf positionbasal + and cauline +
leaf sizereduced +
lobe arrangement or shapelinear +
lobe widthnarrow +
margin shapeentire +, lacerate +, dentate + and lobed +
midvein widththickened +
pappus durationpersistent +
peduncle architectureebracteate + and leafy +
peduncle orientationerect + and curved-ascending +
peduncle shapeinflated +
petiole widthbroad + and narrow +
phyllary external texture or internal textureherbaceous +
phyllary height or lengthshorter +
phyllary positionouter + and inner +
phyllary shapedeltate + and lanceolate +
phyllary sizeunequal +
rachis widthnarrow +
receptacle architectureepaleate +
receptacle external textureglabrous +
receptacle reliefpitted +
receptacle shapeflat + and low-convex +
rib architecture or external texture or reliefsmooth +
rib external texturewhite-villous +
rib external texture or reliefscabrous +
scale colorationsilvery +, yellowish +, brownish + and blackish +
scale shapearistate +
scale sizereduced +
stem architecturesimple +, to many-branched +, naked + and leafy +
stem countfew +
stem external textureglabrous + and scurfy-pubescent +
stem orientationerect +
whole organism architecturetaprooted + and rhizomatous +
whole organism life styleannual + and perennial +