Ricinus communis L.
(Castor-oil / Castor Bean Plant)
The castor-oil plant is not native to Istria and is rarely seen to be grown
there. However, castor-oil's medicinal properties have been known and were used among the
Istrian people.
Gabriele D'Annunzio
is credited for originating the practice of forcibly dosing
opponents with large amounts of castor
oil to humiliate, disable or kill them during the brief period when he
occupied Fiume (now Rijeka, Croatia) and declared himself dictator. This practice became a common
tool of Fascist dictator Benito Mussolini and was used in Istria during the period of
Italian rule between the two World Wars.
Ricunus communis is a single gigantic herb (tree-like in the tropics), and the only species of
the genus Ricinus (ris'i-nus) of the spurge family. The castor oil plant is cultivated widely in the tropics and subtropics and in temperate latitudes.
It is grown for
commercial and medicinal applications, as
well as for ornamental use in gardens,
sometimes as a houseplant, and it also grows as a weed. It is an annual in the
south and a perennial in the tropics.
Family: Euphorbiaceae (spurge family)
Biological name: Ricinus communis [and also Ricinus dicoccus?]
Common names: Castor-oil plant, Castor, Castor bean, Castorseed
(English), Eranda, Vatari, Rendi, Bofareira, castor-oil plant, Mexico
seed, oil plant, Palma Christi, Cici/Kiki (by the ancient Egyptians, according
to Pliny) Higuerilla (Spanish), Ricin (French), Ricino
(Italian), Bherenda (Bengali), Rehri, Erand (Hindi), Amanakkum (Tamil), Gandharv
Hasta (Sanskrit), Chittamanakku (Malyalam), It is also known as Amanakkam-chedi,
Amanakku, Amidamu, Amudam, Arand, Aranda, Audla, Avanakku, Ayrunkukri, Bedanjir,
Bherenda, Chittavanakku, Chittmani, Diveli, Endaru, Endi, Eramudapu, Erand,
Erendi, Erandthailam, Eri, Gandharva Haralu, Hasthah, Gemeiner Wunderbaum,
Heran, Kesusi, Khirva, Miniak-jarah, Panchangulam, Ricinus, Sadabherenda,
Verenda, and probably by other names as well. History
The scientific name for the castor plant, Ricinus
communis, has a much more logical derivation. Communis means common
in Latin, and castor plants were already commonly naturalized in many parts of
the world when the eighteenth century Swedish naturalist Carolus Linnaeus (Karl
von Linné) was giving scientific first and last names to plants and animals over
200 years ago. Ricinus is the Latin word for tick and is the specific
epithet for the Mediterranean sheep tick (Ixodes ricinus). Apparently
Linnaeus thought the seeds looked like ticks, particularly large ticks engorged
with blood. [See Castor Seed below.]
Description
In frost-free areas, castor bean is an evergreen herbaceous or
semiwoody large shrub or small tree that gets up to 40 ft. (12 m) tall and
15 ft. (4.6 m) wide. In the tropics, it can have a trunk that is woody
near the base and up to a foot in diameter. Elsewhere, castor bean plant
grows as an annual that can get 8-15 ft. (2.4-4.6 m) tall in a single
growing season. This is a fast growing, suckering, colony forming plant
with decidedly tropical looking foliage. They tend to grow straight up at
first, developing branches only later in the season (and in subsequent
years for plants that live that long). The huge leaves are palmate, with
5-11 deeply incised lobes. They are glossy purplish or reddish-green and
12-30 in (30-76 cm) across, with long petioles (leaf stems). The stems are
watery juicy and reddish or purplish too. The inflorescence is not
particularly showy; small, 0.5 in (1 cm) wide greenish yellow flowers are
borne in fat spikes 8-18" tall near the tops of the stems.
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Ricinus communis
"Carmencitas" in the New York Botanical Garden |
A terminal raceme of flowers appears in later summer. Female flowers are on the top half of the spike and have conspicuous
fuzzy red stigmas (the parts that receive the pollen). The male flowers on
the lower half of the spike have conspicuous yellow anthers (the parts
that give off the pollen). The female flowers are followed by oblong or
egg-shaped reddish-brown fruit is a soft and flexible spiny pod or capsule
about an inch long. The pod turns brown when ripe and splits into three one-seeded parts. The seeds are smooth, glossy, black or mottled with gray or brown.
The flat seeds explode out f the seed pod when ripen. They look like fat swollen dog ticks and
are deadly poisonous.
There are several named cultivars, including some grown commercially
for oil production, and this sampling of ornamentals: 'Carmencita' has
bronzy red leaves and bright red female flowers. 'Impala' is small, 4-5
ft. (1.2-1.5 m) tall and has red leaves that age to reddish purple.
'Sanguineus' has blood-red stems and leaves. 'Gibsonii Mirabilis' is
dwarf, only 4' tall, and has dark red leaves and stems. 'Zanzibarensis' is
taller and has larger leaves that are green with white veins.
Location / HabitatCastor bean was originally native to northeastern (tropical) Africa and
the Middle East. It has escaped cultivation and become naturalized as a
weed almost everywhere in the world that has a tropical or subtropical
climate. Castor bean grows wild on rocky hillsides, and in waste places,
fallow fields, along road shoulders and at the edges of cultivated lands.
In Suriname it grows as a common weed often in colonies, in the coastal
region. Castor bean has escaped cultivation and established in waste
areas, the edges of cultivated fields, canal banks, etc., in South
Florida, but it has not become a serious pest weed. It is, however, listed
as a Category II Species (has the potential to disrupt native plant
communities) by the Florida Exotic Pest Plant Council. Castor bean is one
of 34 species that the Florida Nursery Grower's Association's Board of
Directors voted unanimously in March 2001 to no longer propagate, sell or
use in Florida (click for press release). The California Exotic Pest Plant
Council includes castor bean on their List B, defined as a wildland pest
plant of lesser invasiveness than those on List A.
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The tree is very variable in habit and appearance, the known varieties
being very numerous, and having mostly been described as species. In the
tropical latitudes which is most favorable to its growth, it becomes a
tree some 30 to 40 feet in height; in the Azores and in the warmer
Mediterranean countries - Algeria, Egypt, Greece and the Riviera - it is
of more slender growth, attaining an average height of only 10 to 15 feet,
and farther north in France, and in this country, where it is cultivated
mostly as an ornamental plant, on account of its large and beautiful
foliage, it is merely a shrubby branched annual herb, rarely more than 4
to 5 feet high.
As grown in the North, the castor-oil plant is a tender annual 48-150 in.
high. The flowers are green and inconspicuous, but pink or red in the pigmented
varieties. Many stamens are near the base and branching pistils are near the top
of the flower. The soft-spined fruits containing attractively mottled seeds are
distinctive features of the plant. Leaves alternate, often 3 ft. wide, 6 to
11 lobed, palmate and with uneven serrated edge, are red or colored and often
have a blue-gray bloom, and there is also a green variety. The joints of the
hollow stem, stalks and leaves are reddish to purple. The stalk is attached to
the middle of the blade, which is divided nearly to the middle by several lobes.
Flowers in a dense, terminal cluster often 1-2 ft. high, the individual flowers
small, without petals, the sexes separate. Fruit a spiny pod (capsule)
containing the beautifully marked, poisonous seeds. (Ricinus is the classical
Latin name of this plant.)
The common castor-oil plant is usually grown in the form with green foliage,
but there are several other varieties. One has much larger, green leaves.
Another has red stems and bluish-gray leaves, and there are several with red and
one with variegated leaves. One with white-veined leaves is offered as
"mosquito-plant."
For further details on the plant's characteristics, see "Poisonous
Plants Page, Ricinus Communis,
https://res.agr.ca./
Features
The castor bean seed coat contains ricin, one
of the most poisonous naturally occurring chemicals known to Man; even
very small doses can be fatal. Castor oil, derived from castor beans, is
used extensively in medicine and in varnishes and paints, as a lubricant
and lamp oil, and in many other industrial and manufacturing processes.
The foul tasting laxative, castor oil, loathed by children everywhere,
tastes poisonous but is, however, a valuable purgative still widely used
in modern medicine. Castor oil also is used externally to treat some kinds
of skin diseases including ringworms and warts. The genus name, Ricinus
means "dog tick" in Latin, because that's what the seeds look
like.
Parts used: oil, leaves, roots, seeds, fruit
Constituents:
- Fatty oil (42-55%)
- Proteins (20-25%)
- Lectins (0.1-0.7%): including among others ricin D (RCA-60. severely
toxic), RCA-120 (less toxic)
- Pyridine alkaloids
- Triglycerides: chief fatty acids ricinoleic acid (12-hydroxy-oleic
acid, share 85-90%)
- Tocopherols (Vitamin E)
Culture
Castor bean is very easy to grow; too easy, some might say. They like
full sun and have a
tendency to self sow and new seedlings can pop up all summer long. This is
one of the fastest growing plants in the world and becomes almost
tree-like
in 3-4 months. It will need to be staked if grown where the wind can blow
it over.
Hardiness: USDA Zones 8 - 11. Castor bean is a big evergreen shrub or
small tree in zones 10-11, and is a tender perennial. It usually won't live through the winter, but can be
expected to reseed itself in zones 8 and 9, and maybe in zone 7. Plants
sometimes sprout back from the roots after freezing in zones 8B and 9.
In zones with shorter growing seasons, - 7 (lower than seven) start sowing indoors at 8 (eight) weeks before last expected frost.
Castor
bean is widely grown as an annual in cooler climates and can
tolerate a touch of frost.
Moisture: Castor bean grows fastest and largest with abundant water, but once it gets established, it can tolerate drought - it just won't grow as fast.
Propagation: seeds and cuttings. Castor bean seeds germinate
quickly, and the plants grow very fast. They can be expected to self sow
under favorable conditions. Germination can be hastened if the seeds are
soaked in water for 24 hours or nicked with a file before planting. Sow in
place in zones 8-11. In areas with shorter growing seasons, or to get a
head start, sow seeds indoors in individual containers 6-8 weeks before
the last expected frost.
Usage
- Commercial
- Medicinal
- Ornamental - most gardeners grow castor bean plants in small
groups as specimen plants to create a tropical look. This is a large,
coarse textured plant that grows very fast in a single season to fill
in a big area or serve as temporary landscaping or quick screening. In
frost free areas they are grown in large borders or allowed to
naturalize in the back of the landscape. In frosty climates, the
castor bean plant is the best way to create a tropical effect around
the swimming pool or patio.
Sources:
- Text - Norman Taylor, Taylor's Encyclopedia of Gardening, 4th Ed.,
Houghton Mifflin Company, Boston (Cambridge, 1961), p. 198, 737.
- Photographs - Ricinus
communis - https://www.gifte.de/ricinus_communis__bild01.htm
- Text and photographs - Castorbean
- https://www.ansci.cornell.edu/plants/castorbean.html
- Cici/kiki - The Ancient Egyptians, Revised and
Abridged from his larger Work, J. Gardner Wilkinson, D.C.L., F.R.S. &c,,
in two volumes, Vol II, John Murray (London, 1854), p. 23-24 and 36.
- Photograph - https://www.baobabs.com/Ricinus%20communis.htm
- Botanical online - https://www.botanical-online.com/fotosricinuscommunis.htm
- Floridata - Ricinus
communis - https://www.floridata.com/ref/r/rici_com.cfm
- Medicinal uses - https://plants.gardenbed.com/57/5685_med.asp
- Photographs - https://www.teninfo.com/flores/floracanaria/canaria004.htm
- https://www.cedarvale.net/carrieroils/castor.htm
- https://www.cedarvale.net/carrieroils/turkey.htm
- https://chiron.valdosta.edu/rgoddard/biol4900/corbett/corbett2.htm
- https://www.hort.purdue.edu/newcrop/afcm/castor.html
See also:
- Terror, Muder and Medicine -
https://chiron.valdosta.edu/rgoddard/biol4900/corbett/corbett.htm
- Purdue University, Castor: Return of an
old crop -
https://www.hort.purdue.edu/newcrop/proceedings1993/V2-380.html
-
https://www.missouriplants.com/Redalt/Ricinus_communis_page.html
- Purdue University,
https://www.hort.purdue.edu/newcrop/duke_energy/Ricinus_communis.html
-
https://www.csdl.tamu.edu/FLORA/cgi/gallery_query?q=Ricinus+communis
- Rare books from the MBG Library,
Kohler's Medizinal Pflanzen (1761 drawings) -
https://www.mobot.org/MOBOT/research/library/kohler/
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