| | APSnet Education Center - Introductions to the Major Pathogen Groups - Introduction to Parasitic Flowering Plants (Site not responding. Last check: 2007-10-08) |
 | | In general, holoparasites tend to have leaves reduced to scales (or absent in Hydnoraceae), succulent stems, and a primary haustorium (derived from the seedling radicle). |
 | | For example, Orobanchaceae are most specialized in a number of endemic genera in South Africa, followed by the Southeastern United States (open, fire-maintained communities), and the Alps of Central Europe (open grasslands). |
 | | In the past, the hemiparasitic members of this family were classified as part of Scrophulariaceae (the figwort family) while the holoparasitic members were included in Orobanchaceae (the broomrape family). |
| www.apsnet.org /education/IntroPlantPath/PathogenGroups/Parasiticplants (6765 words) |