Drosera filiformis

Drosera filiformis, commonly known as the thread-leaved sundew,[1] is a small, insectivorous, rosette-forming species of perennial herb. A species of sundew, it is unusual within its genus in that the long, erect, filiform (thread-like)[1] leaves of this plant unroll in spirals – an arrangement similar to the circinate vernation seen in ferns.

Thread-leaved sundew
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Droseraceae
Genus: Drosera
Subgenus: Drosera subg. Drosera
Section: Drosera sect. Drosera
Species:
D. filiformis
Binomial name
Drosera filiformis
Raf. (1808)
Synonyms
  • Drosera filiformis
    auct. non Raf.: R.Hamet (1907)
    [=D. filiformis/D. filiformis var. tracyi/D. filiformis × D. intermedia]
  • Drosera leionema
    Raf. (1836)
  • Drosera tenuifolia
    Willd. (1809)
  • Drosera tracyi
    Macf. ex Diels (1906)
  • Filicirna filiformis
    (Raf.) Raf. (1836)
  • Filicirna leionema
    (Raf.) Raf. (1836)
  • Filicirna tenuifolia
    (Willd.) Raf. (1836)

Distribution and habitat

D. filiformis occurs naturally in both Canada and the United States; its natural range extends down the eastern seaboard of North America from south western Nova Scotia[1] in the north down through New England to Florida in the south.

Cultivation

D. filiformis is frequently cultivated, with a few registered cultivars, such as D. filiformis var. filiformis (also known as D. filiformis typical), D. filiformis × 'California Sunset' (a hybrid between D. filiformis var. filiformis. All of these cultivars are grown with similar conditions as most other Drosera species: mineral-poor soil and distilled, reverse osmosis, or collected rain water. D. filiformis require a winter dormancy for long-term survival, forming hibernacula in the winter.

Infraspecific taxa
  • Drosera filiformis f. tracyi (Macf. ex Diels) Macf. (1914)
  • Drosera filiformis var. tracyi (Macf. ex Diels) Diels (1906)
  • Drosera filiformis var. typica Winne (1944) nom.illeg.
Part of leaf of wild Drosera filiformis var. tracyi, with captured insect
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References
  1. Canadian Committee on the status of Endangered Wildlife in Canada report for D. filiformis
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