Dictyosperma

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Dictyosperma
Cultivated specimens on Réunion
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Arecales
Family: Arecaceae
Subfamily: Arecoideae
Tribe: Areceae
Genus: Dictyosperma
H. Wendl. & Drude[1]
Species: D. album
Binomial name
Dictyosperma album
(Bory) H. Wendl. & Drude ex-Scheff.
Synonyms

Areca alba

Dictyosperma is a monotypic genus of flowering plant in the palm family found in the Mascarene Islands. The sole species, Dictyosperma album, is widely cultivated in the tropics but has been farmed to near extinction in its native habitat.[2] It is commonly called princess palm or hurricane palm, the latter owing to its ability to withstand strong winds by easily shedding leaves.[3] It is closely related to, and resembles, palms in the Archontophoenix genus.[3] The genus is named from two Greek words meaning "net" and "seed" and the epithet is Latin for "white", the common color of the crownshaft at the top of the trunk.

Description

Fruit
The ringed trunks are solitary at 15 cm in diameter with a slight bulge at the base, occasionally reaching up to 12 m in height. The crownshaft is over a meter tall, swollen at the base, and covered in white wax— which has given the palm its epithet album— and small, matted brown hairs, producing a rounded leaf crown 4.5 m wide and 3 m tall. The 2.5 to 3 m leaves are borne on short 30 cm petioles; the arching leaflets are pointed at the apice, from 60 – 90 cm, dark green in color, and emerge from the rachis in a single plane.

On flowering, they produce up to six inflorescences which ring the trunk below the crownshaft, branched to one order, with white to yellow flowers, which are male and female; both pistillate and staminate flowers have three sepals and three petals, the former being smaller than the latter. The ovoid fruit ripen to purple or black in color, containing one brown, ellipsoidal seed.

Three varieties are currently recognized:

  • Dictyosperma album var. album (Bory) Scheff.
  • Dictyosperma album var. aureum Balf.f. in J.G.Baker
  • Dictyosperma album var. conjugatum H.E.Moore & J.Guého

Distribution and habitat

Living in the coastal forests of the Mascarenes, they experience warm temperatures, high humidity and regular rainfall.[4]

  • Trunk base and roots

  • Seedlings with bifid eophyll

  • Leaf crown

  • Dictyosperma album var. conjugatum

References

  1. ↑ H.A. Wendland & Drude, Linnaea 39:181. 1875 Type:D. album
  2. ↑ Dictyosperma album, Floridata website (accessed March 19, 2008)
  3. ↑ 3.0 3.1 Riffle, Robert L. and Craft, Paul (2003) An Encyclopedia of Cultivated Palms. Portland: Timber Press. ISBN 0-88192-558-6 / ISBN 978-0-88192-558-6
  4. ↑ Uhl, Natalie W. and Dransfield, John (1987) Genera Palmarum - A classification of palms based on the work of Harold E. Moore. Lawrence, Kansas: Allen Press. ISBN 0-935868-30-5 / ISBN 978-0-935868-30-2

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