pleiochasiumn.

Brit.

/ˌplʌɪəˈkeɪzɪəm/, U.S.

/ˌplaɪəˈkeɪziəm/

Inflections: Plural pleiochasia.

Origin: Formed within English, by compounding. Etymons: pleio- comb. form, dichasium n.

Etymology: < pleio- comb. form + -chasium (in dichasium n.). Compare monochasium n.

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).

单词	pleiochasium
释义	pleiochasiumn. Brit. /ˌplʌɪəˈkeɪzɪəm/, U.S. /ˌplaɪəˈkeɪziəm/ Inflections: Plural pleiochasia. Origin: Formed within English, by compounding. Etymons: pleio- comb. form, dichasium n. Etymology: < pleio- comb. form + -chasium (in dichasium n.). Compare monochasium n. 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). < n.1890
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