|Houston camphor daisy, Houston machaeranthera|
|(Gray) Hartman & Lane|
The following Participating Institutions are custodians for this species in the CPC National Collection:
Mercer Arboretum and Botanic Gardens
The conservation of Rayjacksonia aurea is fully sponsored.
Dave Berkshire contributed to this Plant Profile.
The Houston camphor daisy's range spans only Galveston and Harris counties. It is a tap-rooted annual member in the sunflower family with attractive golden-yellow camphor-scented flowers in October and November. Although it can grow up to waist high in cultivation, in its characteristically harsh native environment, it is often found hugging the ground and growing only a few inches high. Houston camphor daisy is often associated with the rare endemic plants, Texas windmill grass, Chloris texensis and prairie dawn, Hymenoxys texana.
Distribution & Occurrence
Coastal prairies of Harris and Galveston Counties, Texas. Historically occurs on "pimple" or "mima" mounds, natural bare spots in these native coastal prairies.
|Less than 20 populations (Wieland 1996). Some sites in E. Texas in Harris and Galveston Counties. Six sites in Harris County have had seeds banked.
Poole(2000) reports that there are 26 records from Texas, approximately 50% from 1980 or later. Sites occur on both private and public lands.
This plant is under current review for possible federal listing as either endangered or threatened.
Conservation, Ecology & Research
Current populations are under threat from competition by woody vegetation and require mowing or controlled burning (Pr
Seed has been harvested at Mercer from its off-site conservation beds.
Germination and growth to maturity studies performed at Mercer by Greg Wieland. Plants are propagated by seed.
Seeds from several sites within Harris County were collected by Dr. Larry Brown of Houston Community College and Ralph Taylor of the Harris County Flood Control District and are stored at Mercer Arboretum and Botanic Gardens. Banked seeds date to 1994. Mercer also banks subsets of rare seeds collected from field surveys and from propagation work with our collaborating CPC institution, the Lady Bird Johnson Wildflower Center, Austin, TX and the National Center for Genetic Resources Preservation (NCGRP) in Ft. Collins, CO (formerly called the National Seed Storage Laboratories).
Identification of potential reintroduction sites.
Public education of these plants and associated endemics.
Poole, J.M.; Carr, W.R.; Price, D.M.; Singhurst, J.R. 2007. Rare Plants of Texas. College Station, TX. Texas A&M University Press. 640p.