Drosera Linnaeus 1753
Creators: name: Rjosk, A.
name: Neinhuis, C.
name: Monizi, M.
name: Lautenschläger, T.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Droseraceae
Drosera

description: <i>Drosera</i> L. — Fig. 2 <i>Drosera</i> L. (1753) 281; Keay (1954) 120; Oberm. (1970) 189; J.R. Laundon (1978) 64; Kubitzki &amp; C.Bayer (2003) 201; A.M. Ellison &amp; Adamec (2018) 50. — Type: <i>D. rotundifolia</i> L. Carnivorous, annual or perennial herbs. <i>Stems</i> caulescent or acaulescent. <i>Leaves</i> simple, in a basal rosette or alternate to spirally arranged along the stem; stipules present or absent, membranous, often lacerated; petiole present or confluent with lamina; lamina variously shaped (Fig. 2), adaxial surface covered with short- and long-stalked glands (tentacles) and digestive glands that trap and digest insects. <i>Inflorescences</i> 1–many-flowered cymes, axillary or terminal, flowers bisexual. <i>Sepals</i> 5 (rarely 4–8); ± connate at the base. <i>Petals</i> 5 (rarely 4–8); free. <i>Stamens</i> 5 (rarely 4–8); free. <i>Pollen</i> in tetrads. <i>Pistil</i>: ovary (2–)3–5 carpels; styles (2–)3–5. <i>Fruit</i> a loculocidal capsule. <i>Seeds</i> small, numerous. Distribution — Over 240 species, almost worldwide. Habitat &amp; Ecology — Swamps, sandy, seasonally and peren- nially wet and low-nutrient habitats. <b> KEY TO THE ANGOLAN AND CONGOLESE <i>DROSERA</i> SPECIES</b> 1. Stipules absent, lamina linear............. 6. <i>D. indica</i> 1. Stipules present, lamina lanceolate, spathulate, obovate, ovate, elliptic, suborbicular or orbicular.............. 2 2. Acaulescent, leaves in a basal rosette, leaves horizontal. 3 2. Caulescent, including short stems (one to several cm long, rarely appearing acaulescent), young leaves erect, older leaves variable (erect, perpendicular to stem, reflexed).. 5 3. Seeds fusiform, seed testa reticulate, peduncle strongly curved at the base, peduncle, pedicels and sepals glabrous, glandular or pilose, petals pink or purple. — Usually caules- cent, rarely dwarf forms with suppressed stems................................... 8. <i>D. madagascariensis</i> 3. Seeds ovoid, seed testa smooth or reticulate, peduncle curved at the base, peduncle, pedicels and sepals glandular or pilose, petals pink to purple or white.............. 4 4. Petiole narrow, abruptly broadening into the suborbicular to spathulate lamina, peduncle, pedicels and sepals glandular, petals white or purple, seed testa reticulate 3. <i>D. burkeana</i> 4. Petiole gradually broadening into the elliptic to obovate lamina, peduncle, pedicels and sepals usually pilose, petals pink to purple, seed testa smooth.......... 9. <i>D. pilosa</i> 5. Peduncle arising apically, erect throughout its whole length, stem very short (c. 4 cm long), densely pilose, seeds sub- orbicular to ovoid.................... 2. <i>D. bequaertii</i> 5. Peduncle arising laterally, curved or erect at the base, then ascending, stem short to very long (up to 90 cm), glabrous, glandular or pilose, seeds fusiform................. 6 6. Older (but still green) leaves reflexed towards the stem, old parts of the stem enclosed with old reflexed leaves, peduncle strongly curved at the base..... 8. <i>D. madagascariensis</i> 6. Older (but still green) leaves held erect or ± perpendicular to the stem (rarely reflexed), peduncle ± curved at the base 7 7. Stem up to 90 cm long, older (but still green) leaves per- pendicular to stem, lamina obovate to elliptic, peduncle and petioles pilose or glandular-pilose........ 4. <i>D. elongata</i> 7. Stem shorter (max. 25 cm long, sometimes longer), older (but still green) leaves ± erect, lamina ± spathulate, peduncles and petioles glabrous/sparsely pilose or densely pilose. 8 8. Peduncle and petioles densely pilose/hirsute, stem up to 15 cm long, densely glandular, lamina oblong-spathulate. &amp;horbar; Only known from Katanga, DRC.... 7. <i>D. katangensis</i> 8. Peduncle and petioles glabrous or sparsely pilose, stem short (up to 10 cm) or elongated (up to 25 cm), glabrous, lamina narrowly spathulate, spathulate or obovate..... 9 9. Stem short (up to 10 cm), leaves closely arranged, petioles very slender and 3–7 cm long............. 1. <i>D. affinis</i> 9. Stem elongated (up to 25 cm, sometimes longer), alternating between segments with evenly spaced leaves and segments with rosette-like clustered leaves, petioles max. 3.2 cm long.............................. 5. <i>D. flexicaulis</i>
description: Published as part of <i>Rjosk, A., Neinhuis, C., Monizi, M. &amp; Lautenschläger, T., 2022, Synopsis of the genus Drosera (Droseraceae) in Angola and the Democratic Republic of the Congo, pp. 1-14 in Blumea - Biodiversity, Evolution and Biogeography of Plants 67 (1)</i> on pages 3-4, DOI: 10.3767/blumea.2022.67.01.03, http://zenodo.org/record/7679465
description: {"references": ["Keay RWJ. 1954. Flora of West Tropical Africa. Crown Agents for Oversea Governments and Administrations, London.", "Laundon JR. 1978. Droseraceae. In: Launert E (ed), Flora Zambesiaca. Flora Zambesiaca Managing Committee, London.", "Ellison AM, Adamec L (eds). 2018. Carnivorous plants - physiology, ecology, and evolution. Oxford University Press, Oxford."]}