TRIPLEUROSPERMUM

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Tripleurospermum often has been included within Matricaria. It is distinguished from the latter by 3-ribbed cypselae with 2 abaxial-apical resin sacs versus 5-ribbed cypselae without apical sacs, and by production of 7-glycoside flavonols versus 3-glycosides (K. Bremer and C. J. Humphries 1993). C. Oberprieler (2001) showed that Tripleurospermum is closely related to Anthemis in the strict sense and not to Matricaria. This is supported by the tetrasporic embryo sac shared by Tripleurospermum and Anthemis (versus monosporic in Matricaria and other anthemid genera), similarity of karyotype, and the presence in both genera of matricaria ester in the polyacetylene pathway, otherwise unknown in the tribe.

Facts about "TRIPLEUROSPERMUM"
apex shapetruncate +
array architecturecorymbiform +
blade shapeoblong + and lobed +
chromosome count9 +
corolla colorationwhite +, pinkish +, yellow + and greenish +
cypsela shapetrigonous + and compressed +
face external textureglabrous + and hairy +
face reliefrugose + and tuberculate +
floret architecturepistillate +
floret atypical count0 +
floret reproductionfertile + and bisexual +
hair fixationbasifixed +
head architecture or arrangementradiate +
head architecture or shapediscoid + and disciform +
head arrangementsingly + and in corymbiform arrays +
involucre shapehemispheric + and patelliform +
lamina shapeoblong +
leaf architecturepetiolate + and sessile +
leaf behaviourwithering +
leaf conditionmarcescent +
leaf positionbasal + and cauline +
lobe count5 +
lobe shapedeltate +
margin colorationpale +, brown + and black +
margin external texturescarious +
margin shapecrenate + and serrate +
pappus count0 +
pappus shapecoroniform + and each adaxial auricle +
pericarp positionabaxial-apical +
phyllary durationpersistent +
phyllary fusiondistinct +
phyllary shapeovate +
phyllary sizeunequal + and subequal +
receptacle architecturesolid + and epaleate +
receptacle shapeconvex + and conic +
rib architecture or external texture or reliefsmooth +
rib colorationwhitish +
rib count2 + and 1 +
rib positionabaxial +, lateral + and adaxial +
rib widththick +
stem architecturebranched + and simple +
stem external textureglabrous + and hairy +
stem habitprocumbent +
stem orientationerect + and ascending +
throat shapecampanulate +, cylindric + and compressed +
tube architecture or exudationsessile-glandular +
tube shapecylindric +
whole organism life styleannual +, biennial + and perennial +