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Cycas arenicola K. D. Hill

Cycas arenicola

provided by wikipedia EN

Cycas arenicola is a species of cycad in the genus Cycas, native to Australia, in the far north of Northern Territory in the basin of the upper East Alligator River in Arnhem Land. It grows in Eucalyptus woodlands on highly siliceous soils (sandstone derived). They thrive in open situations.

The stems reach 1.5 m (rarely 2.5 m) tall, with a diameter of 15–20 cm. The leaves are numerous, 0.9-1.6 m long, pinnate with 180-200 leaflets, glossy bright green above, pubescent beneath with brown pubescence, the leaflets are oriented 60-90 degrees forward without overlapping. The petiole is brown pubescent, 25–35 cm long, armed with spines.

The female cones open, with sporophylls 15–20 cm long, grey with orange hairs, each with 4-6 ovules. Margins toothed, with bright orange sarcotesta when ripened. The male cones are solitary, spindle shaped, 25 cm long and 9 cm diameter.

The name derives from Latin arena and -cola, "sand dweller", the species growing in sandstone habitats.

First described in 1993 by Hill, the plant is not thought to be threatened as its range occurs on Aboriginal land and is very remote. The plant is dependent on very dry, seasonally variable conditions, and is susceptible to crown rot.

References

  1. ^ Hill, K.D. (2010). "Cycas arenicola". IUCN Red List of Threatened Species. 2010: e.T41969A10613296. Retrieved 26 June 2022.
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Cycas arenicola: Brief Summary

provided by wikipedia EN

Cycas arenicola is a species of cycad in the genus Cycas, native to Australia, in the far north of Northern Territory in the basin of the upper East Alligator River in Arnhem Land. It grows in Eucalyptus woodlands on highly siliceous soils (sandstone derived). They thrive in open situations.

The stems reach 1.5 m (rarely 2.5 m) tall, with a diameter of 15–20 cm. The leaves are numerous, 0.9-1.6 m long, pinnate with 180-200 leaflets, glossy bright green above, pubescent beneath with brown pubescence, the leaflets are oriented 60-90 degrees forward without overlapping. The petiole is brown pubescent, 25–35 cm long, armed with spines.

The female cones open, with sporophylls 15–20 cm long, grey with orange hairs, each with 4-6 ovules. Margins toothed, with bright orange sarcotesta when ripened. The male cones are solitary, spindle shaped, 25 cm long and 9 cm diameter.

The name derives from Latin arena and -cola, "sand dweller", the species growing in sandstone habitats.

First described in 1993 by Hill, the plant is not thought to be threatened as its range occurs on Aboriginal land and is very remote. The plant is dependent on very dry, seasonally variable conditions, and is susceptible to crown rot.

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Cycas arenicola ( Italian )

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Cycas arenicola K.D.Hill, 1993 è una pianta appartenente alla famiglia delle Cycadaceae, endemica dell'Australia.

Descrizione

È una cicade con fusto eretto, alto sino a 1,5 m e con diametro di 15-20 cm.[2]

Le foglie, pennate, lunghe 90-160 cm, sono disposte a corona all'apice del fusto e sono rette da un picciolo lungo 25-35 cm; ogni foglia è composta da 90-100 paia di foglioline lanceolate, con margine intero, lunghe mediamente 9-19 cm, di colore verde, inserite sul rachide con un angolo di 60-90°.

È una specie dioica con esemplari maschili che presentano microsporofilli disposti a formare strobili terminali fusiformi, lunghi circa 25 cm e larghi 5-9 cm ed esemplari femminili con macrosporofilli) che si trovano in gran numero nella parte sommitale del fusto, con l'aspetto di foglie pennate che racchiudono gli ovuli, in numero di 4-6.

I semi sono grossolanamente ovoidali, lunghi 28-32 mm, ricoperti da un tegumento di colore rosso arancio.

Distribuzione e habitat

Questa specie è diffusa nel Territorio del Nord dell'Australia.[1]

Predilige i suoli sabbiosi.

Conservazione

La IUCN Red List classifica C. arenicola come specie prossima alla minaccia (Near Threatened)[1].
La specie è inserita nella Appendice II della Convention on International Trade of Endangered Species (CITES)[3]

Note

  1. ^ a b c (EN) Hill, K.D. 2010, Cycas arenicola, su IUCN Red List of Threatened Species, Versione 2020.2, IUCN, 2020.
  2. ^ Whitelock 2002, pp. 84-85.
  3. ^ CITES - Appendices I, II and III (PDF), in Convention On International Trade In Endangered Species Of Wild Fauna And Flora, International Environment House, 2011 (archiviato dall'url originale il 4 agosto 2012).

Bibliografia

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Cycas arenicola: Brief Summary ( Italian )

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Cycas arenicola K.D.Hill, 1993 è una pianta appartenente alla famiglia delle Cycadaceae, endemica dell'Australia.

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Cycas arenicola ( Portuguese )

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Cycas arenicola é uma espécie de cicadófita do género Cycas da família Cycadaceae, nativa do Território do Norte (Austrália).[2] Segundo dados de 2010, a população encontra-se estável.

Referências citadas

  1. Telopea 5:419. 1993.
  2. USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Base de Dados Disponível na Internet]. National Germplasm Resources Laboratory, Beltsville, Maryland. Cycas arenicola Arquivado em 9 de fevereiro de 2010, no Wayback Machine. (8 de Abril de 2010)

Outras referências

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Cycas arenicola: Brief Summary ( Portuguese )

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Cycas arenicola é uma espécie de cicadófita do género Cycas da família Cycadaceae, nativa do Território do Norte (Austrália). Segundo dados de 2010, a população encontra-se estável.

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