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Monograph of Euphorbia sect. Tithymalopsis(Euphorbiaceae)

Published online by Cambridge University Press:  26 April 2010

K. Park
K. Park
Affiliation:
Department of Biology, Kyung-Nam University, 449 Wolyoung-dong, Masan 631-701, Korea.
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Abstract

Euphorbia sect. Tithymalopsis (Euphorbiaceae) comprises seven species of herbaceous perennials restricted to the south-eastern USA. The species of sect. Tithymalopsis are united and distinguished from other sections in Euphorbia by having a thick and cylindrical root system, a glabrous cyathium, five glands with petaloid appendages, one to three stems arising from the root, absence of vestigial sepals in pistillate flowers, rounded leaf apices, and pitted or smooth seeds without a caruncle. Cladistic analyses indicate that sect. Tithymalopsis consists of two subgroups: (1) E. corollata, E. discoidalis, E. pubentissima and E. polyphylla; and (2) E. curtisii, E. gracilior and E. mercurialina. Comparative data from vegetative morphology, pollen morphology, seed morphology, cytology, crossability, reproductive biology, habitat and distribution are presented. Keys and descriptions to the species are provided.

Keywords

Euphorbiasect. Tithymalopsis
Type
Articles
Information
Edinburgh Journal of Botany , Volume 55 , Issue 2 , July 1998 , pp. 161 - 208
Copyright
Copyright © Cambridge University Press 1998

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