I only use dedicated macro lenses in this field of photography. An all round zoom lens with a macro facility will not suffice and although you will still be able to obtain images they will not be of the quality of those when using a true macro lens.
I use a Canon 100mm USM macro lens. The USM relates to the "ultra sonic motor", which effectively means its very smooth and quiet when auto focusing.
Some lenses are quite noisy which could effect your subject matter. I also possess a Sigma EX DG 180 mm USM macro lens for really close up detailed images, using a monopod for stability.
A Useful Gadget
When taking either high up or low down images it's not always possible to look through the view finder of your camera. A useful gadget is the "Zigview Angle Finder". On digital SLR's there is a fixed LCD screen. Although some cameras now have "live view", I do not find this overly useful.
The Zigview is attached to the view finder of your camera and the live image is then shown on an adjustable and movable LCD screen.
This enables you to compose your image at arms length, which is very useful with species like the Scarce Chaser which perches at head height or above on tall umbellifers and emergent vegetation.