pleiochasiumn.
/ˌplʌɪəˈkeɪzɪəm/, U.S. /ˌplaɪəˈkeɪziəm/ Botany.
A cyme in which branching is continued by more than two lateral axes. Cf. monochasium n., dichasium n.
ΘΚΠ
the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > inflorescence or collective flower > [noun] > of particular type, shape, or arrangement > cyme or verticillaster
cyma1706
cyme1785
thyrsula1832
verticillaster1832
cincinnus1857
pleiochasium1890
1890 Cent. Dict. 4551/3 Pleiochasium, in bot., a cyme with three or more lateral axes.
1924 Amer. Midland Naturalist 9 157 The pleiochasium is rare in E[uphorbia] Ipecacuanhae; it depends mostly upon the development of three bracts.
1935 Ann. Missouri Bot. Garden 22 9 Truly ‘perfect’ cymes, whether di- or pleiochasia or derivatives of these, are found only upon flowering plants with opposite or whorled phyllotaxy.
1965 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 127 If the branching is continued by more than two branches of the same order, then the system is called a pleiochasium.
1996 Systematic Bot. 21 225/1 Staminate flowers 9–10, arranged in 3 branches of a 4-branched pleiochasium.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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n.1890