Cycas revoluta

Cycas revoluta
Leaves and male cone of Cycas revoluta
Conservation status
Scientific classification
Kingdom: Plantae
Division: Cycadophyta
Class: Cycadopsida
Order: Cycadales
Family: Cycadaceae
Genus: Cycas
Species: C. revoluta
Binomial name
Cycas revoluta

Cycas revoluta (the sago cycad), is a plant native to southern Japan. Though often known by the common name of king sago palm, or just sago palm, it is not a palm at all, but a cycad.



This very symmetrical plant supports a crown of shiny, dark green leaves on a thick shaggy trunk that is typically about 20 cm (7.9 in) in diameter, sometimes wider. The trunk is very low to subterranean in young plants, but lengthens above ground with age. It can grow into very old specimens with 6–7 m (over 20 feet) of trunk; however, the plant is very slow-growing and requires about 50–100 years to achieve this height. Trunks can branch multiple times, thus producing multiple heads of leaves.

Cycas revoluta

The leaves are a deep semiglossy green and about 50–150 cm (20–59 in) long when the plants are of a reproductive age. They grow out into a feather-like rosette to 1 m (3.3 ft) in diameter. The crowded, stiff, narrow leaflets are 8–18 cm (3.1–7.1 in) long and have strongly recurved or revolute edges. The basal leaflets become more like spines. The petiole or stems of the Sago Cycad are 6–10 cm (2.4–3.9 in) long and have small protective barbs that must be avoided.

Propagation of Cycas revoluta is either by seed or by removal of basal offsets. As with other cycads, it is dioecious, with the males bearing cones and the females bearing groups of megasporophylls. Pollination can be done naturally by insects or artificially.

Cultivation and Uses

Cycas revoluta is one of the most widely cultivated cycads, grown outdoors in warm temperate and subtropical regions, or under glass in colder areas. It grows best in sandy, well-drained soil, preferably with some organic matter. It needs good drainage or it will rot. It is fairly drought-tolerant and grows well in full sun or outdoor shade, but needs bright light when grown indoors. The leaves can bleach somewhat if moved from indoors to full sun outdoors.

Of all the cycads, the Sago Palm is the most popular in horticulture. It is seen in almost all botanical gardens, in both temperate and tropical locations. In many areas of the world, it is heavily promoted commercially as a landscape plant. It is also quite popular as a bonsai plant. First described in the late 18th century, it is native to various areas of southern Japan and is thus tolerant of mild to somewhat cold temperatures, provided the ground is dry. Frost damage can occur at temperatures below −10 °C (14 °F) and there are several healthy plants that have been grown with little protection as far north as Nashville, Tennessee and Newport News, Virginia, both are in zone 7b. C. revoluta usually defoliates in this temperate climate, but it usually will flush (or grow) several new leaves by April. It does however require hot summers with mean temperatures of 30 to 35 °C (86 to 95 °F) for successful growth, making outdoor growing impossible in colder places such as northern Europe or the Northeast US, even where winter temperatures are not too cold. One disadvantage of its domestic use is that it is poisonous to animals (this includes humans).


Cycad Sago Palm is extremely poisonous to animals (this includes humans) if ingested. Pets are at particular risk since they seem to find the plant very palatable.[2] Clinical symptoms of ingestion will develop within 12 hours and may include vomiting, diarrhea, weakness, seizures, liver failure, or hepatotoxicity characterized by icterus, cirrhosis, and ascites. The pet may appear bruised, have nose bleeds (epistaxis), melena (blood in the stool), hematochezia (bloody straining), and hemarthrosis (blood in the joints).[3] The ASPCA Animal Poison Control Center estimates a fatality rate of 50 to 75 percent when ingestion of the Sago Palm is involved. The incidence of Sago Palm ingestion by pets has risen by over 200% in the last five years.[4] If any quantity of the plant is ingested, a poison control center or doctor should be contacted immediately. Effects of ingestion can include permanent internal damage and death.

All parts of the plant are toxic; however, the seeds contain the highest level of the toxin cycasin. Cycasin causes gastrointestinal irritation, and in high enough doses, leads to liver failure.[5] Other toxins include Beta-methylamino L-alanine, a neurotoxic amino acid, and an unidentified toxin which has been observed to cause hindlimb paralysis in cattle.[6]


  1. ^ Hill (2003). Cycas revoluta. 2006. IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006.
  2. ^ Suspected cycad (Cycas revoluta) intoxication in dogs, Botha CJ, Naude TW, Swan GE, et al.| J S Afr Vet Assoc | 1991
  3. ^ Muller-Esneault, Susan (2009). "Cycas Revoluta: The Sago Palm, or Cycad Toxicity". 
  4. ^ "Trouble in Paradise: Sago Palm" (Press release). ASPCA. 2008-07-16. 
  5. ^ Selected poisonous plant concerns small animals, Knight MW, Dorman DC | Vet Med | 1997 | 92(3):260-272
  6. ^ Toxicology Brief: Cycad toxicosis in dogs, Hany Youssef| Veterinary Medicine | May 1, 2008 | [1]


External links

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Look at other dictionaries:

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  • Cycas revoluta — Sago Sa go (s[=a] g[ o]), n. [Malay. s[=a]gu.] A dry granulated starch imported from the East Indies, much used for making puddings and as an article of diet for the sick; also, as starch, for stiffening textile fabrics. It is prepared from the… …   The Collaborative International Dictionary of English

  • Cycas revoluta — ID 24018 Symbol Key CYRE11 Common Name sago palm Family Cycadaceae Category Gymnosperm Division Cycadophyta US Nativity Introduced to U.S. US/NA Plant Yes State Distribution FL, GA, PR Growth Habit Tree, Shrub Dura …   USDA Plant Characteristics

  • Cycas revoluta — Las cycas son un grupo de plantas con aspecto similar a las palmeras pero sin estar emparentadas con ellas. Subconjunto de las gimnospermas, portadoras de semillas sin flor. Estas plantas, de las que existen unas 15 especies, fueron muy… …   Enciclopedia Universal

  • Cycas revoluta — noun dwarf palmlike cycad of Japan that yields sago • Syn: ↑sago palm • Hypernyms: ↑cycad • Hyponyms: ↑false sago, ↑fern palm, ↑Cycas circinalis • …   Useful english dictionary

  • Cycas revoluta — …   Википедия

  • Cycas revoluta Thunb. — Symbol CYRE11 Common Name sago palm Botanical Family Cycadaceae …   Scientific plant list

  • Cycas Du Japon — Cycas du Japon …   Wikipédia en Français

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