The World Flora Online

SELECTED REFERENCES Williams, S. E., V. A. Albert, and M. W. Chase. 1994. Relations of the Droseraceae: A cladistic analysis of rbcL sequence and morphological data. Amer. J. Bot. 81: 1027–1037. Wood, C. E. Jr. 1960. The genera of Sarraceniaceae and Droseraceae in the southeastern United States. J. Arnold Arbor. 41: 152–163.

Herbs, annual or perennial, carnivorous, scapose. Leaves in basal rosettes (alternate-cauline in Drosera intermedia); stipulate or estipulate; petiolate; blade infolded or circinate in vernation, modified as hinged, jawlike trap (Dionaea) [Aldrovanda] or bearing mucilage-tipped, irritable, multicelled hairs (Drosera) [Drosophyllum]. Inflorescences terminal, umbel-like cymes (Dionaea) or lateral, circinate or scorpioid cymes (Drosera), multiflowered (rarely 1-flowered). Flowers: perianth and androecium hypogynous; sepals 5, distinct or connate basally; petals 5, distinct; stamens usually 5 (Drosera) or (10–)15(–20) (Dionaea), distinct or sometimes connate basally; pistils 1, compound, 3–5-carpellate; ovary superior, 1-locular; placentation basal (Dionaea) or parietal (Drosera); styles 1 and undivided (Dionaea) or 3[5] and bifid (Drosera); stigma plumose (Dionaea) or capitate (Drosera). Fruits capsular.

Herbes insectivores, généralement vivaces, généralement terrestres ou rarement aquatiques, souvent glanduleuses, à racine primaire très tôt remplacée par des racines adventives. Stipules présentes ou absentes. Feuilles disposées en rosette ou alternes le long de la tige, à préfoliaison circinée, pétiolées ; limbe pourvu de tentacules glanduleuses irritables. Inflorescences généralement latérales, parfois terminales ou axillaires, à fleurs en cymes ou rarement solitaires. Fleurs hermaphrodites, actinomorphes ; sépales (4)5(à 8), un peu soudés à la base, imbriqués, persistants ; pétales (4)5(à 12), imbriqués ou contortés ; étamines 5 ou 20, plus rarement 4 ou 10, à filets libres; anthères extrorses, à déhiscence longitudinale ; ovaire supère, à 3(à 5) carpelles, uniloculaire à placentation pariétale ou basilaire, à ovules nombreux, anatropes ; styles 1 ou 3, libres ou diversement unis, à stigmates simples ou diversement divisés. Fruits capsulaires, à déhiscence loculicide ou valvaire. Graines à albumen charnu, parfois ailées ; embryon petit, droit, à cotylédons courts.

Famille avec trois genres, dont deux monotypiques, et environ 250 espèces, répandues sur tout le globe, sauf dans les territoires polaires et dans les régions steppo-désertiques de l’Afrique et de l’Asie ; un centre de diversification principal se situe en Australie et un centre secondaire en Amérique tropicale ; seul le genre Drosera est représenté en Afrique centrale.

Herbes'généralement vivaces, de petite taille, souvent glanduleuses, à racine primaire très tôt remplacée par des racines adventives.'Feuilles'disposées en rosette ou éparses le long de la tige, à préfoliaison circinée, stipulées ou non, pourvues de tentacules irritables.'Inflorescences'cymeuses, généralement latérales.'Fleurs'☿, généralement 5-mères; sépales un peu soudés à la base, imbriqués; pétales imbriqués; androcée pléio- ou isomère; étamines à filets libres; anthères extrorses, à déhiscence longitudinale; pollen groupé en tétrades; ovaire supère, à 3-5 carpelles, uniloculaire à placentation pariétale ou basilaire; ovules nombreux, anatropes; styles 3-5 variablement divisés.'Fruit'capsulaire, à déhiscence loculicide.'Graines à albumen charnu; embryon petit, droit, à cotylédons courts.\n\t\t\tQuatre genres, dont 3 monotypes, et près de 100 espèces; seul, le genre'Drosera est représenté au Congo belge. Les Droséracées sont répandues sur tout le globe, sauf dans les territoires polaires et dans les régions steppo-désertiques de l'ancien continent; un centre de distribution principal se situe en Australie et un centre secondaire en Amérique tropicale.

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

Sepals 4–8, basally connate, imbricate Flowers in racemes or cymes or occasionally solitary, actinomorphic, hypogynous, bisexual Leaves in whorls or alternate, frequently in basal rosettes; lamina with glandular excrescences; stipules usually present Annual or perennial insectivorous herbs Petals 4–8, free, imbricate 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 Stamens 5–20 in 1 or more whorls; filaments free or united at the base; anthers 2-locular, dehiscing by longitudinal slits Seeds small, with endosperm Fruit a loculicidal capsule Flowers in racemes or cymes or occasionally solitary, actinomorphic, hypogynous, bisexual Leaves in whorls or alternate, frequently in basal rosettes; lamina with glandular excrescences; stipules usually present Annual or perennial insectivorous herbs Petals 4–8, free, imbricate 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 Stamens 5–20 in 1 or more whorls; filaments free or united at the base; anthers 2-locular, dehiscing by longitudinal slits Seeds small, with endosperm Fruit a loculicidal capsule

Fls regular, perfect, hypogynous, usually 5-merous; pet distinct, convolute; cal, cor, and stamens withering persistent; anthers versatile, extrorse; ovary unilocular with (3–) many ovules on parietal placentas or on an essentially basal placenta; styles distinct and often also deeply bifid, or (Dionaea) united to form a common style; fr usually a loculicidal capsule; seeds 3–many, ± spindle-shaped, with copious endosperm and a short, dicotyledonous embryo; annual to perennial insectivorous herbs of bogs and marshes, commonly acaulescent and with a rosette of basal lvs, these basically alternate (rarely whorled), often circinate in bud, the blade either modified as an active trap or more often provided with irritable, mucilage-tipped tentacle-hairs. 4/100, widespread.

Herbs perennial or annual, mostly terrestrial or rarely aquatic, carnivorous. Stem with much reduced leaf blades that function as rhizoids below ground, with or without tubers or rhizomes. Leaves basal and rosulate, or alternate, rarely whorled, stipulate or exstipulate; leaf blade with sticky, glandular hairs, or with sensitive hairs that trigger closing of blade to trap small animals, juvenile leaf blade circinate. Flowers axillary, lateral or terminal, usually borne in a cincinnus, rarely in a raceme or solitary, bisexual, actinomorphic, 4- or 5-merous. Sepals 4 or 5(or 6-8), persistent. Petals as many as sepals or more. Stamens 4 or 5, hypogynous, free, alternate with petals; anthers 2-loculed, dehiscing by longitudinal slits. Ovary superior or nearly so, globose or ovoid, 2-5-carpellate, 1-3-loculed; placentation parietal or basal; styles (2 or )3-5(or 6), simple or branched; stigma simple or multifid. Fruit a capsule, dehiscent or indehiscent. Seeds few to numerous; endosperm fleshy; embryo straight.

Seeds small, with endosperm Fruit a loculicidal capsule Flowers in racemes or cymes or occasionally solitary, regular, hypogynous, hermaphrodite Petals 4–8, imbricate, free, convolute Sepals 4–8, imbricate, basally connate 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 Stamens 5–20 in 1 or more whorls Leaves in whorls or spirally arranged Insectivorous herbs Fruit a loculicidal capsule Flowers in racemes or cymes or occasionally solitary, regular, hypogynous, hermaphrodite Petals 4–8, imbricate, free, convolute Sepals 4–8, imbricate, basally connate 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 Stamens 5–20 in 1 or more whorls Leaves in whorls or spirally arranged Insectivorous herbs