1. Droseraceae Salisb.

    1. This family is accepted.

[NTK]

Every, J.L.R. (2009). Neotropical Droseraceae.

Morphology
Description

Carnivorous herbs. Leaves alternate , forming basal rosettes, rarely alternate or whorled on short stems, , simple , with sticky glandular trichomes (appearing as tentacles) present on lamina and petiolesmargins entire ; stipulate (can be scaly or leafy). Inflorescence terminal , cymose, paniculate, racemose, rarely solitary. Flowers actinomorphic , bisexual , ebracteate; sepals (4-)5-8(-12), imbricate , persistent ; petals (4-)5-8(-12), polypetalous, alternating with short-lived sepals; stamens (4-)5(-20),   free from and alternating with perianth , anthers extrorse, longitudinally dehiscent ; ovary superior , syncarpous, carpels (2-)3(-5); styles (2-)3(-5), much- divided . Fruits loculicidal capsules. Seeds  3 to numerous.

General Description
Notes on delimitation
  • Regularly allied with other carnivorous plant groups such as the Nepenthaceae and Sarraceniaceae.
  • Currently placed in the Caryophyllales in a group which includes the extra-Neotropical Nepenthaceae, the monotypic (and recently included member of the Droseraceae) Drosopyllaceae, plus Dioncophyllaceae and Ancistrocladaceae (APG III & Stevens 2008).
Number of genera
  • 1: Drosera with ca. 20 species.
Status
  • Native.
General notes
  • Known as the 'Sundews'.
Distribution
Distribution in the Neotropics
  • Have adapted to grow in wet areas with very few available nutrients - such as bogs and swamps.
  • Found from sea-level to altitudes over 3,000m throughout the Neotropics.
Diagnostic
Distinguishing characters (always present)
  • Modified, insectivorous leaves with enzyme-secreting, tentacle-like glandular trichomes.
Key differences from similar families
  • The Neotropical representatives of the Sarraceniaceae, Heliamphora Benth, have highly modified leaves called 'amphores' which are employed as insect-traps.
Literature
Important literature

Culham, A. 2007. Droseraceae. In: Heywood V.H., Brummitt R.K., Culham A. and Seberg O. (eds.). Flowering Plant Families of the World. Pp. 132-133. Royal Botanic Gardens, Kew.

Mireya, D. & Correa, A. 2004. Droseraceae. In: Smith, N., Mori, S.A., Henderson, A., Stevenson, D.W. and Heald, S.V. (eds.). Flowering Plants of the Neotropics. Pp.132-133. The New York Botanical Garden, Princeton University Press, Princeton.

Stevens, P.F. 2008. Angiosperm Phylogeny Website. Version 9 onwards. http://www.mobot.org/MOBOT/research/APweb/.

Watson, L. and Dallwitz, M.J. (1992 onwards). The Families of Flowering Plants: Descriptions, Illustrations, Identification, and Information Retrieval. Version 3rd March 2009. http://delta-intkey.com.

[FWTA]

Droseraceae, Hutchinson and Dalziel. Flora of West Tropical Africa 1:1. 1954

Habit
Herbs, often stemless with rosettes of leaves, the latter usually covered with sticky stipitate glands which entrap insects
Flowers
Flowers actinomorphic, hermaphrodite, in usually simple circinate cymes
Calyx
Sepals 5–4, more or less connate at the base, imbricate, persistent
Corolla
Petals 5, hypogynous, very rarely perigynous, nervose
Androecium
Stamens 4–20, often 5, hypogynous, free or rarely united at the base; anthers 2-celled, extrorse, opening by longitudinal slits
Gynoecium
Ovary free, 1-celled, with parietal or subbasal placentas; ovules many or rarely few; styles 3–5, mostly free
Fruits
Fruit a loculicidal capsule
Seeds
Seeds numerous, with fleshy endosperm; embryo straight; cotyledons short
[FTEA]

Droseraceae, J.R. Laundon. Flora of Tropical East Africa. 1959

Habit
Insectivorous herbs
Leaves
Leaves in whorls or spirally arranged
Flowers
Flowers in racemes or cymes or occasionally solitary, regular, hypogynous, hermaphrodite
Calyx
Sepals 4–8, imbricate, basally connate
Corolla
Petals 4–8, imbricate, free, convolute
Androecium
Stamens 5–20 in 1 or more whorls
Gynoecium
Ovary superior, syncarpous, 3–5-carpellary, unilocular; styles 3–5, free or somewhat united, simple or branched; ovules numerous, on 3–5 parietal placentas or a free-basal placenta
Fruits
Fruit a loculicidal capsule
Seeds
Seeds small, with endosperm
[FZ]

Droseraceae, J. R. Laudon. Flora Zambesiaca 4. 1978

Habit
Annual or perennial insectivorous herbs
Leaves
Leaves in whorls or alternate, frequently in basal rosettes; lamina with glandular excrescences; stipules usually present
Flowers
Flowers in racemes or cymes or occasionally solitary, actinomorphic, hypogynous, bisexual
Calyx
Sepals 4–8, basally connate, imbricate
Corolla
Petals 4–8, free, imbricate
Androecium
Stamens 5–20 in 1 or more whorls; filaments free or united at the base; anthers 2-locular, dehiscing by longitudinal slits
Gynoecium
Ovary superior, syncarpous, 3–5-carpellary, 1-locular; styles 3–5, free or more or less united, simple or branched; ovules numerous, on 3–5 parietal placentas or a free basal placenta
Fruits
Fruit a loculicidal capsule
Seeds
Seeds small, with endosperm

Images

Droseraceae Salisb. appears in other Kew resources:

First published in Parad. Lond. 2: ad t. 95. 1808 [1 Feb 1808] (1808)

Accepted by

  • APG IV (2016) http://dx.doi.org/10.1111/boj.12385

Sources

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of West Tropical Africa
Flora of West Tropical Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Neotropikey
Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
http://creativecommons.org/licenses/by/3.0