monochasiumn.

Brit.

/ˌmɒnə(ʊ)ˈkeɪzɪəm/, U.S.

/ˌmɑnəˈkeɪziəm/

Inflections: Plural monochasia Brit.

/ˌmɒnə(ʊ)ˈkeɪzɪə/, U.S.

/ˌmɑnoʊˈkeɪziə/.

Origin: A borrowing from German. Etymon: German Monochasium.

Etymology: Either < German Monochasium (1894 in the passage translated in quot. 1898, though perhaps earlier; compare attribution to Eichler in quot. 1890), or independently < its elements mono- comb. form + -chasium (in dichasium n.). Compare slightly earlier monochasial adj.

Botany.

A cyme in which each flowering branch gives rise to one lateral branch, so that the inflorescence is helicoid or asymmetrical.

ΚΠ

1890 Cent. Dict. Monochasium, a cyme with one main axis; a uniparous cyme: a term proposed by Eichler.

1898 H. C. Porter tr. E. Strasburger et al. Text-bk. Bot. 461 A monochasium is termed a helicoid cyme or bostryx when the lateral branches always arise on the same side of the pseudaxis.

1908 Bot. Gaz. 46 180 This [inflorescence] represents in our species of Sisyrinchium a rhipidium, and this type of monochasium is frequent among the Irideae.

1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 134 Each year the terminal bud for the time being of the horizontal monochasium turns up and gives rise to an aerial shoot.

1992 M. Ingrouille Diversity & Evol. Land Plants 158 If a single lateral branch is produced at the node, various kinds of monochasia are produced, depending on the orientation of the bud and subsequent buds.

This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).

单词	monochasium
释义	monochasiumn. Brit. /ˌmɒnə(ʊ)ˈkeɪzɪəm/, U.S. /ˌmɑnəˈkeɪziəm/ Inflections: Plural monochasia Brit. /ˌmɒnə(ʊ)ˈkeɪzɪə/, U.S. /ˌmɑnoʊˈkeɪziə/. Origin: A borrowing from German. Etymon: German Monochasium. Etymology: Either < German Monochasium (1894 in the passage translated in quot. 1898, though perhaps earlier; compare attribution to Eichler in quot. 1890), or independently < its elements mono- comb. form + -chasium (in dichasium n.). Compare slightly earlier monochasial adj. Botany. A cyme in which each flowering branch gives rise to one lateral branch, so that the inflorescence is helicoid or asymmetrical. ΚΠ 1890 Cent. Dict. Monochasium, a cyme with one main axis; a uniparous cyme: a term proposed by Eichler. 1898 H. C. Porter tr. E. Strasburger et al. Text-bk. Bot. 461 A monochasium is termed a helicoid cyme or bostryx when the lateral branches always arise on the same side of the pseudaxis. 1908 Bot. Gaz. 46 180 This [inflorescence] represents in our species of Sisyrinchium a rhipidium, and this type of monochasium is frequent among the Irideae. 1976 P. Bell & D. Coombe tr. Strasburger's Textbk. Bot. (new ed.) 134 Each year the terminal bud for the time being of the horizontal monochasium turns up and gives rise to an aerial shoot. 1992 M. Ingrouille Diversity & Evol. Land Plants 158 If a single lateral branch is produced at the node, various kinds of monochasia are produced, depending on the orientation of the bud and subsequent buds. This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022). < n.1890
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