|Subgenus:||Drosera subg. Ergaleium|
|Section:||Drosera sect. Ergaleium|
Drosera marchantii is an erect perennial tuberous species in the carnivorous plant genus Drosera. It is endemic to Western Australia and grows in a variety of habitats, including swampy areas and hilltops in laterite-silica sand soils. D. marchantii produces small, circular, peltate carnivorous leaves along stiff stems that can be 10–40 cm (4–16 in) high. Its pink flowers emerge from June to October.
Drosera marchantii was first described and named by Larry Eugene DeBuhr in 1975. In 1992, N. G. Marchant and Allen Lowrie published the formal description of D. marchantii subsp. prophylla, a subspecies that is distinguished by its white flowers, smaller height, and numerous bracts (prophylls) on the lower part of the stem. It has only been found in a small area north of Perth and is listed by Western Australia's Department of Environment and Conservation as a priority three poorly known taxon on the Declared Rare and Priority Flora List.
- "Drosera marchantii". FloraBase. Western Australian Government Department of Parks and Wildlife.
- D'Amato, Peter. 1998. The Savage Garden: Cultivating Carnivorous Plants. Ten Speed Press: Berkeley, California. pp. 157.
- Rice, Barry. 2009. The tuberous erect & scrambling Drosera. The Carnivorous Plant FAQ. Accessed online: 29 August 2009.
- "Drosera marchantii subsp. prophylla". FloraBase. Western Australian Government Department of Parks and Wildlife.
- Marchant, N. G., and Lowrie, A. 1992. New names and new combinations in 34 taxa of Western Australian tuberous and pygmy Drosera. Kew Bulletin, 47(2): 315-328.
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