The purpose of this study was to investigate the parasitic behavior of several species of hemiparasites (containing chlorophyll) and "complete" (non-green) parasites of the angiospermous families Scrophulariaceae and Orobanchanceae. Among the points considered were the development and longevity of the parasitic attachments, the mophology of the host-parasite union, correlations of parasitism with morphological or ecological adaptations, the determination of the taxonomic range in hosts, and the frequency of attachment to a host when more than a single host was involved. The species involved and the types of data collected for each are summarized in the table below. All species were observed in as great a range of habitats and elevations as could be studied in the time available. Distributional data for the species concerned were obtained for a wide area in the middle Rocky Mountain region herbaria in Wyoming, Idaho, and Montana. Project Number 147.
Piehl, Martin A.
"Studies of Hemi-parasitic and Parasitic Flowering Plants,"
Jackson Hole Research Station Annual Report: Vol. 1967
, Article 12.
Available at: https://repository.uwyo.edu/jhrs_reports/vol1967/iss1/12