Where I have found a website of an Australian botanical artist I've included it below. If you know of any I've missed, please do let me know.

Nilavan Adams

Beverly Allen

Anita Barley

Deirdre Bean

Lauren Black
Susannah Blaxill
Lesley Elkan

Sharon Field
Helen Fitzgerald
Cheryl Hodges

Annie Hughes
David Mackay
Fiona McGlynn
Margaret Muffet
Elaine Musgrave

Julie Dagmar Nettleton
Leonie Norton
Rita Parkinson
John Pastoriza-Pinol
Jenny Phillips

Sandra Sanger
Louise Saunders
Dawn Undery
Sue Wickison
Heidi Willis
Linda Wolfe

The annual Botanica exhibition at the Botanic Gardens in Sydney shows a good range of different Australian artists.

New Zealand

Rebecca Brown

Jenny Coker

Jo Ewing

Janet Marshall

Terrie Reddish

Sue Wickison
 

Botanical Artists in Europe

Germany

Katja Katholing-Bloss
Sylvia Peter

Kay Weber

France
Jacky Jousson

Denise Ramsay

Beatrice Saalburg

Ireland

Mary Dillon

Shevaun Doherty

Yanny Petters

Elizabeth Prendergast

Holly Somerville

Lynn Stringer

Wendy F Walsh

 

Italy

Renata Barilli

Rosemary Lucca

Margaret Saul

Marina Virdis

The Netherlands
Gusta S. Van Dobbenburgh
Ria van Elk
Sigrid Frensen

Eline V. de Jong
Anita Walsmit Sachs

Esmee Winkel

 

Switzerland

Elena Bogatova

 

Austria

Margareta Pertl

 

Sweden

Margaretha Bååth

Rest of the World

 

Brazil

Maria Alice de Rezende

Sergio Allevato

Marcos A. Santos-Silva

Fatima Seleme Zagonel

 

Columbia

Emmanuel Laverde

 

Chile

Geraldine MacKinnon

 

South Korea

Jee-Yeon Koo

Hye Woo Shin

 

Hong Kong

Sandy Ross Sykes

 

Japan

Asuka Hishiki

Yamada Michie

Macoto Murayama

Mariko Nishimoto

 

Canada

Margaret Best

Margaret Walsh Best

Lilyane Coulombe

Vicky Earle

Pamela Meacher

Sherry Mitchell

Lyn Noble

Rayma Kempinsky Peterson

Nellie Sue Potter

Susan G. Taylor

Kerri Weller