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Apocynaceae (from Apocynum, Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison. Members of the family are native to the European, Asian, African, Australian, and American tropics or subtropics, with some temperate members. The former family Asclepiadaceae (now known as Asclepiadoideae) is considered a subfamily of Apocynaceae and contains 348 genera. A list of Apocynaceae genera may be found here.
Many species are tall trees found in tropical forests, but some grow in tropical dry (xeric) environments. Also perennial herbs from temperate zones occur. Many of these plants have milky latex, and many species are poisonous if ingested. Some genera of Apocynaceae, such as Adenium, have milky latex apart from their sap, and others, such as Pachypodium, have clear sap and no latex
As of 2012, the family was described as comprising some 5,100 species, in five subfamilies:
- Apocynoideae Burnett, 1835
- Asclepiadoideae Burnett, 1835 (incorporating the Asclepiadaceae)
- Periplocoideae Endl., 1838
- Rauvolfioideae Kostel., 1834
- Secamonoideae Endl., 1838
The former family Asclepiadaceae is included in Apocynaceae according to the Angiosperm Phylogeny Group III (APG III) modern, largely molecular-based system of flowering plant taxonomy. An updated classification, including 366 genera, 25 tribes and 49 subtribes, was published in 2014.
Distribution and habitat
Species in this family are distributed mainly in tropical regions:
- In the tropical forests and swamps of Indomalaya: small to very tall evergreen trees up to 80 m tall, often with buttress roots, such as Alstonia and Dyera
- In northern Australia: small evergreen trees such as Alstonia, Alyxia, Cerbera and Ochrosia
- In deciduous forests of Africa, India and Indo-China: smaller trees such as Carissa, Wrightia and Holarrhena
- In tropical America, India, Myanmar and Malaya: evergreen trees and shrubs, such as Rauvolfia, Tabernaemontana and Acokanthera
- In Central America: Plumeria, or the frangipani, with its waxy white or pink flowers and a sweet scent
- In South America, Africa and Madagascar: many lianas, such as Landolphia
- In the Mediterranean region: Nerium, with the well-known oleander or be-still tree (Nerium oleander)
- The only genera found in temperate Europe away from the Mediterranean are Vinca (Apocynoideae) and Vincetoxicum (Asclepiadoideae). Also Asclepias syriaca is an invasive weed (e. g., in many areas of Ukraine).
- In North America: Apocynum, dogbane or Indian hemp, including Apocynum cannabinum, a traditional source of fiber
- In continental southern Africa (Angola, Botswana, Mozambique, South Africa, Swaziland, and Zimbabwe) and Madagascar, except for the humid evergreen forest of the eastern side of Madagascar, and never above 2000 m for the entire island: Pachypodium and Fockea
Leaves and stems
Leaves are (simple). Leaves may appear one at a time (singly) with each occurrence on alternating sides of the stem (alternate), but usually occur in pairs or in whorls. When paired, they occur on opposite sides of the stem (opposite), with each pair occurring at an angle rotated 90° to the pair below it (decussate).
Inflorescence and fruit
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Flowers have radial symmetry (actinomorphic), and are borne in heads that are cymes or racemes, but are rarely fasciculate or solitary. They are perfect (bisexual), with a synsepalous, five-lobed calyx united into a tube at the base. Inflorescences are terminal or axillary. Five petals are united into a tube with four or five epipetalous stamens. The style is expanded at the apex into a massive clavuncle just below the stigma. The ovary is usually superior, bicarpellary, and apocarpous, with a common fused style and stigma.
This section needs expansion with: sourced information from texts and other secondary literature, on the known toxicities of Apocynaceae-derived substances. You can help by adding to it. (June 2015)
Many species of plants from the Apocynaceae family have some toxicity, with some being extremely poisonous if parts are ingested, or if they are not handled properly. Genera containing cardiac glycosides— Acokanthera, Apocynum, Cerbera, Nerium, Thevetia, Strophanthus, etc.—have therapeutic ranges, but are often associated with accidental poisonings, in many cases lethal (see below). Alkaloid-producing species like Rauvolfia serpentina, Catharanthus roseus, and Tabernanthe iboga are likewise the source of compounds with possible therapeutic ranges, but which have significant associated toxicities if not taken in appropriate doses and in controlled fashion.
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Several plants of the Apocynaceae family members have had economic uses in the past. Several are sources of important natural products—pharmacologic tool compounds and drug research candidates, and in some cases actual prescription drugs. Cardiac glycosides, which affect heart function, are a ready example. Members studied and known to have such glycosides include the Acokanthera, Apocynum, Cerbera, Nerium, Thevetia and Strophanthus. Rauvolfia serpentina (Indian snakeroot) synthesizes the alkaloids reserpine and rescinnamine, which are of interest in studies of the treatment of high blood pressure, as well as some forms of psychosis. Catharanthus roseus yields alkaloids studied with regard to the treatment of cancer. Certain species of the genus Tabernanthe, most notably Tabernanthe Iboga contain tryptamine alkaloids such as ibogaine in the roots.
Several genera are grown as ornamental plants, including Amsonia (bluestar), Nerium (oleander), Vinca (periwinkle), Carissa (Natal plum), Allamanda (golden trumpet), Plumeria (frangipani), Thevetia (lucky nut), Mandevilla (Savannah flower), and Adenium (desert-rose).
In addition, the genera Landolphia, Hancornia, Funtumia and Mascarenhasia were used as a commercial source of inferior rubber (see Congo rubber, made mostly from various Landolphia species harvested in the wild).
There may be reports of limited dietary uses of plants from this family,[clarification needed]—see however the section on toxicity above. The edible flower of Fernaldia pandurata (common name: loroco) is a popular part of El Salvadorian and Guatemalan cooking. Carissa (Natal plum) produces an edible fruit. The genus Apocynum was reportedly used as a source of fiber by Native Americans. The aromatic fruit juice from Saba comorensis (syn. Landolphia comorensis, the Bungo or Mbungo fruit) is a popular drink,[verification needed] on Pemba Island and other parts of coastal Tanzania.
Finally, ethnopharmacologic and ethnotoxicologic uses are also known. Ibogaine-type alkaloids from the roots of genus Tabernathe have been used in traditional African tribal ceremonies as a source of hallucinogens, and have been studied with regard to the treatment of drug addiction. The juice of Acokanthera species such as A. venenata and the milky juice of the Namibian Pachypodium have reportedly been used as venom for arrow tips by the San people, though others have reported that Pachypodium do not produce such milk.
- Endress ME, Bruyns PV (2000). "A revised classification of the Apocynaceae s.l." (PDF). The Botanical Review. 66 (1): 1–56. doi:10.1007/BF02857781.
- Simpson, M.G. 2010. "Plant Systematics"., 2nd. Ed. Academic Press, Elsevier. ISBN 9780123743800
- Nazia Nazar, David J. Goyder, James J. Clarkson, Tariq Mahmood and Mark W. Chase, 2013, "The taxonomy and systematics of Apocynaceae: Where we stand in 2012," Bot. J. Linn. Soc., 171(3, March), pp. 482–490, see , accessed 22 June 2015.
- Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Bot. J. Linn. Soc. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x.
- Endress M.E., Liede-Schumann S. & Meve U. (2014). "An updated classification for Apocynaceae" (PDF). Phytotaxa. 159 (3): 175–194. doi:10.11646/phytotaxa.159.3.2.
- Apocynaceae, Thomas Rosatti, Jepson Herbarium
- "Apocynaceae usually have copious latex and the leaves are often opposite and with colleters...", retrieved 3/10/18 from ANGIOSPERM PHYLOGENY WEBSITE, version 13 http://www.mobot.org/MOBOT/Research/APweb/
- Klots, Alexander B. (1951). A Field Guide to the Butterflies of North America, East of the Great Plains. Cambridge, Massachusetts: The Riverside Press. pp. 77–79.
- "Saba comorensis in Agroforestree Database" (PDF). Retrieved 30 July 2012.
- Rapanarivo SHJV, Leeuwenberg AJM (1999). "Taxonomic revision of Pachypodium. Series of revisions of Apocynaceac XLVIII". In Rapanarivo SHJV (ed.). Pachypodium (Apocynaceae): taxonomy, habitats and cultivation. Balkema. pp. 1–82. ISBN 978-90-5410-485-8.