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

References
  1. Canadian Committee on the status of Endangered Wildlife in Canada report for D. filiformis
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