Drosera filiformis

Thread-leaved sundew
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Core eudicots
Order:	Caryophyllales
Family:	Droseraceae
Genus:	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)

Part of leaf of wild Drosera filiformis var. tracyi, with captured insect

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.

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 and Louisiana in the south.

Cultivation

D. filiformis is frequently cultivated, with several registered cultivars, such as D. filiformis var. filiformis (also known as D. filiformis typical), D. filiformis var. tracyi (a taller plant, with clear, instead of red, tentacles), D. filiformis × 'California Sunset' (a hybrid between D. filiformis var. filiformis and D. filiformis var. tracyi), and D. filiformis × 'Florida All Red' (a variety that becomes red in full sun, and does not require hibernation in winter). 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. All types of D. filiformis other than 'Florida All Red' 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.

References

1. ^ ^{a b c} Canadian Committee on the status of Endangered Wildlife in Canada report for D. filiformis