Drosera subg. Ergaleium
Encyclopedia
Drosera subg. Ergaleium, collectively known as the tuberous sundews, is a subgenus
of three sections
of tuber
ous species in the genus Drosera. The three sections represent natural groups, including the rosetted
species (section Erythrorhiza
), the fan-leaved species (section Stolonifera
), and the erect or scrambling species (section Ergaleium
).
The subgenus was first formally described by Augustin Pyramus de Candolle in 1824, but the exact taxonomy has been changed frequently since then. In 1848, Jules Émile Planchon
reorganized the species into sections, series
, and subseries. George Bentham
disagreed with Planchon's classification and so in 1864 he divided the genus into just two sections, with all tuberous species in sect. Ergaleium and those without tubers in sect. Rorella. Ludwig Diels
reclassified the genus in his 1906 monograph
of the family, recognizing subgenus Ergaleium and two sections within it: Erythrorhiza (Planchon) Diels and Polypeltes Diels. Another reclassification occurred in 1977, when Larry Eugene DeBuhr added section Stolonifera, which was based on Planchon's subseries Stoloniferae. Section Polypeltes is now known by the older autonym
sect. Ergaleium.
Subgenus
In biology, a subgenus is a taxonomic rank directly below genus.In zoology, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the generic name and the specific epithet: e.g. the Tiger Cowry of the Indo-Pacific, Cypraea tigris Linnaeus, which...
of three sections
Section (botany)
In botany, a section is a taxonomic rank below the genus, but above the species. The subgenus, if present, is higher than the section, and the rank of series, if present, is below the section. Sections are typically used to help organise very large genera, which may have hundreds of species...
of tuber
Tuber
Tubers are various types of modified plant structures that are enlarged to store nutrients. They are used by plants to survive the winter or dry months and provide energy and nutrients for regrowth during the next growing season and they are a means of asexual reproduction...
ous species in the genus Drosera. The three sections represent natural groups, including the rosetted
Rosette (botany)
In botany, a rosette is a circular arrangement of leaves, with all the leaves at a single height.Though rosettes usually sit near the soil, their structure is an example of a modified stem.-Function:...
species (section Erythrorhiza
Drosera sect. Erythrorhiza
Drosera sect. Erythrorhiza is a section of 14 species of tuberous species in the genus Drosera. It represents a natural group of all the rosetted tuberous Drosera...
), the fan-leaved species (section Stolonifera
Drosera sect. Stolonifera
Drosera sect. Stolonifera is a section of nine or ten tuberous perennial species in the genus Drosera that are endemic to south-west Western Australia...
), and the erect or scrambling species (section Ergaleium
Drosera sect. Ergaleium
Drosera sect. Ergaleium is a section of 26 species that are erect or scrambling tuberous plants in the genus Drosera. This section represents a natural group and are taxonomically monophyletic....
).
The subgenus was first formally described by Augustin Pyramus de Candolle in 1824, but the exact taxonomy has been changed frequently since then. In 1848, Jules Émile Planchon
Jules Émile Planchon
Jules Émile Planchon was a French botanist born in Ganges, Hérault.-Biography:After receiving his Doctorate of Science at the University of Montpellier in 1844, he worked for a while at the Royal Botanical Gardens in London, and for a few years was a teacher in Nancy and Ghent...
reorganized the species into sections, series
Series (botany)
Series is a low-level taxonomic rank below that of section but above that of species.In botany, a series is a subdivision of a genus...
, and subseries. George Bentham
George Bentham
George Bentham CMG FRS was an English botanist, characterized by Duane Isely as "the premier systematic botanist of the nineteenth century".- Formative years :...
disagreed with Planchon's classification and so in 1864 he divided the genus into just two sections, with all tuberous species in sect. Ergaleium and those without tubers in sect. Rorella. Ludwig Diels
Ludwig Diels
Dr. Friedrich Ludwig Emil Diels , was a German botanist.Diels was born in Hamburg, the son of the classical scholar Hermann Alexander Diels. From 1900 to 1902 he traveled together with Ernst Pritzel through South Africa, Java, Australia and New Zealand. Shortly before the first world war he...
reclassified the genus in his 1906 monograph
Monograph
A monograph is a work of writing upon a single subject, usually by a single author.It is often a scholarly essay or learned treatise, and may be released in the manner of a book or journal article. It is by definition a single document that forms a complete text in itself...
of the family, recognizing subgenus Ergaleium and two sections within it: Erythrorhiza (Planchon) Diels and Polypeltes Diels. Another reclassification occurred in 1977, when Larry Eugene DeBuhr added section Stolonifera, which was based on Planchon's subseries Stoloniferae. Section Polypeltes is now known by the older autonym
Autonym (botany)
In botanical nomenclature, autonyms are automatically created names, as regulated by the International Code of Botanical Nomenclature . Autonyms are cited without an author. Relevant provisions are in articles 6.8, 22.1-3 and 26.1-3....
sect. Ergaleium.