pleiomerousadj.
/plʌɪˈɒm(ə)rəs/, U.S. /ˌplaɪˈɑm(ə)rəs/ Botany.
Of a floral whorl or flower: having more than the normal number of parts.
ΘΚΠ
the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > [adjective] > having specific arrangement or number of member parts
regular1760
decandrous1808
irregular1826
tetramerous1835
pentamerous1848
symmetrical1849
hexamerous1857
isomerous1857
octamerous1857
anisomerous1861
octomeral1871
hemicyclic1875
zygomorphic1875
zygomorphous1879
tetracyclic1880
heteromerous1882
heterocyclic1895
oligomerous1897
pleiomerous1898
decasepalous-
1898 H. C. Porter tr. E. Strasburger et al. Text-bk. Bot. ii. ii. 453 The origin of a pleiomerous whorl from one consisting of fewer members is equally well shown in the flowers of Tilia.
1928 Jrnl. Genetics 19 162 The disposition towards pleiomery which was common in Winkler's tetraploid [Solanum] nigrum plants I have also met with in my material, but the pleiomerous flowers are very rare.
1997 Brittonia 49 160/1 The phenomenon of pleiomerous early cyathia thus occurs in both subgenera.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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adj.1898