Invasive alien woody plants of the eastern Cape

Abstract

CONTENTS

Invasive alien woody plants of the southern and southwestern Cape region, South Africa

“…This study of the southern and southwestern Cape is the sixth of eight regional surveys which together are designed to reflect invasion by woody alien plants in South Africa as a whole. Surveys have been completed for the former Transvaal (Henderson & Musil 1984), Natal and northeatern Orange Free State (Henderson 1989), Orange Free State (Henderson 1991a), northern Cape (Henderson 1991b) and eastern Cape (Henderson 1992). The survey of this area was undertaken from east to west and during the months of March and October 1990, January and December 1991, February and November 1992, and May 1993 The objectives of the survey were: to produce a check list of the major invasive alien woody plants of stream bank.…”

<i>FSA</i>contributions 18: Salicaceae <i>s.</i> <i>str.</i>

“…P. alba L. (white poplar) and P. x canescens (grey poplar) become naturalized, especially in marshy areas and in river valleys, where they spread by suckering. The latter is now one of the most prominent riverine invaders in southern Africa (Henderson & Musil 1984;Henderson 1989Henderson , 1991aHenderson , 1992Henderson , 1998 Tree up to 30 m tall, with trunk up to 1 m or more diam. and branches spreading to form a wide, rounded crown; spreading by root sprouts.…”

“…Commonly called match poplar, cottonwood or neck lace poplar. A native of the United States of America, but is cultivated and occasionally naturalized along water courses in South Africa (Henderson & Musil 1984;Henderson 1989Henderson , 1991bHenderson , 1992Henderson , 1998 (Figure 5). …”

“…Commonly known as the Lombardy poplar, a cultivar from the original species, which is a native of Europe. Infertile and often spreads by means of suckers along watercourses, particularly in the eastern Free State (Henderson 1991a), Lesotho, Western Cape and Eastern Cape (Henderson 1992) (Figure 7 Deciduous trees or shrubs with usually terete branches lacking terminal buds; winter buds each protected by a single calyptrate scale, buds sometimes glutinous; branch es ± flexible. Leaves alternate, petiolate or sessile, oblong, lanceolate or linear, entire or serrulate; stipules present or absent.…”

Ploidy determination of black wattle (Acacia mearnsii) using stomatal chloroplast counts

“…This produce triploids oflow fertility has been exploited by species produces between 65 000 to 90 000 seeds per "the fruit plant breeding industry for years to produce kilogram, which are capable ofremaining viable for seedless fruit including banana (Ortiz andVuylsteke, many years and still maintain 50-80% germination 1998), a Citrus hybrid (Cavalcante et al, 2000) and rate and thereby suppressing natural vegetation melon (Ezura et al, 1993). Autotetraploids are (Henderson, 1989;1992;1998;Joker, 2000;Schumann generally produced by use of spindle inhibitors and Turnbull et al, 1998). It is well (commonly colchicine) that prevent microtubule known that invading alien plants have significant formation and chromosome migration at anaphase impacts on the economy (Kumar and Singh, 1998).…”