Grevillea obtusiflora subsp. obtusiflora and subsp. fecunda Recovery Plan
NSW National Parks and Wildlife Service, September 2001
ISBN 0 731 36281 0
Appendix 3. Monitoring
A number of field trips have been conducted to examine the habitat of the sub-populations, search for further sites and to determine numbers of plants and to gain knowledge of the plant's ecology. These field searches have defined the parameters of existing sites, this is shown in Appendix 1. Searches in other areas of suitable habitat have been carried out and maps showing area of searches accompany this report. No other sites have been found.
The flowering period of both subspecies was closely monitored, and flowers dissected in an attempt to define a physical reason for the inability of G. obtusiflora subsp. obtusiflora to form seedpods and seed. Photos were taken of habitats, plants, flowers and macro-photographs taken of flowers, both dissected and whole and of the seed and seedpods of G. obtusiflora subsp. fecunda. Pollinator species for G. obtusiflora subsp. fecunda were noted. Flower heads in both G. obtusiflora subsp. obtusiflora and G. obtusiflora subsp. fecunda populations were bagged in an attempt to gather seed if produced. A total of 12 seeds were collected from G. obtusiflora subsp. fecunda. Propagation trials have not commenced with these seeds to date.
In G. obtusiflora subsp. obtusiflora, flowers and styles on some plants were noted to wither, and in some cases just drop from the plant. Ants were also found in some flowers. No swelling of the ovary was detected in any G. obtusiflora subsp. obtusiflora flower.
The clonal root system was investigated and found to be much more substantial in G. obtusiflora subsp. obtusiflora than G. obtusiflora subsp. fecunda, with roots extending for many metres. Pathogens were looked for and in the case of G. obtusiflora subsp. obtusiflora detected, in the form of a Mycosphaerella fungus on several plants.
Samples from each site were collected and submitted to the Herbarium of NSW. Threatening processes were identified and are addressed in this recovery plan.