Cycas calcicola: Difference between revisions
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| species = '''''C. calcicola''''' |
| species = '''''C. calcicola''''' |
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| binomial = ''Cycas calcicola'' |
| binomial = ''Cycas calcicola'' |
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| binomial_authority = Maconochie |
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==Description== |
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'''''Cycas calcicola''''' is a species of [[cycad]] in the genus ''[[Cycas]]'', native to northern [[Australia]] in the northwest of [[Northern Territory]]. |
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'''''Cycas calcicola''''' is named from latin for calx, latin for lime, and cola, latin for dweller. This plant doe sindeed thrive in limestone areas. Its common names are Zamia bush, zamia palm and ricket bush. The stems are [[decumbent]] to erect. Suckering is often seen via pups. Stems grown to 5 m long, 17-30 cm in diameter. [[Cataphyll]]s soft and triangular, with leaves numerous, dark green, 80-90 cm long, with emergent leaves with silver [[tomentose]]. Leaflets in 100-140 pairs, with silver tomentose. Basal leaflets are spines, and all are slightly angled forward. |
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The stems are erect, 2-5 m tall and 16-22 cm diameter. The [[leaf|leaves]] are variably deep green and glabrous to white tomentose above, and persistently white tomentose below, 60-130 cm long, pinnate, with 210-410 leaflets. The leaflets are 5-12 cm long and 2-4 mm wide, and lie flat either side of the leaf stem (not in a 'v'-shape like most other ''Cycas'' species). The [[petiole]]s are 18-30 cm long, and armed with sharp spines at the base. |
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Female cones open, [[sporophyll]]s loose, 12-18 cm long. Brown tomentose present, becoming glabrous. 4-6 ovules per sporophyll. Lamina elliptical or rhombic. [[Sarcotesta]] brown-orange, [[sclerotesta]] short ovoid to globular, shallow grooves covering surface of it. Male cones solitary and erect, narrow ovoid in shape. 17-30 cm long, 5-7 cm in diameter. Sporophylls 15-25 mm. |
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The female [[strobilus|cones]] are open, with [[sporophyll]]s 12-18 cm long, with four to six ovules per sporophyll. The lamina is lanceolate, with spined dentate margins and an apical spine. The male cones are solitary, narrow ovoid, 25-30 cm long and 5-7 cm diameter, brown, the sporophylls 25-30 mm long with an upturned apical spine. |
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Native to [[Northern Territory]], [[Australia]]. This cycad grows in hot, dry, [[limestone]] derived outcroppings in association with [[Eucalyptus]] and [[Livistona]]. Fonud near the East Alligator Creek and near Bamboo Creek near [[Darwin, Northern Territory]]. The presence of dense tomentose across the leaflets and leaves creates optical illusions of changing color, much like [[velour]]. Stems are contractile, an adaptation to seasonal fires common to its native area. The plant seems to produce new foliage after fires destroy old foliage, and cones seem to be produced soon after the burns. This is a similar trait to other cycas genus members of Northern Territory. |
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This cycad grows in a hot, dry, climate, often in association with ''[[Eucalyptus]]'' and ''[[Livistona]]''. It was first found on [[limestone]] soil, from which the name ''calcicola'' "lime-dwelling" derives, but is not confined to limestone, also occurring on soils derived from [[sandstone]] and [[schist]]. |
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==References== |
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*[http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/cycadpg?taxname=Cycas+calcicola Cycad Pages: ''Cycas calcicola''] |
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*[http://www.iucnredlist.org/search/details.php/41989/all IUCN Redlist: ''Cycas calcicola''] |
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[[Category:Cycads]] |
[[Category:Cycads]] |
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Revision as of 10:18, 2 October 2006
| Cycas calcicola | |
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| Species: | C. calcicola
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| Cycas calcicola Maconochie
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Cycas calcicola is a species of cycad in the genus Cycas, native to northern Australia in the northwest of Northern Territory.
The stems are erect, 2-5 m tall and 16-22 cm diameter. The leaves are variably deep green and glabrous to white tomentose above, and persistently white tomentose below, 60-130 cm long, pinnate, with 210-410 leaflets. The leaflets are 5-12 cm long and 2-4 mm wide, and lie flat either side of the leaf stem (not in a 'v'-shape like most other Cycas species). The petioles are 18-30 cm long, and armed with sharp spines at the base.
The female cones are open, with sporophylls 12-18 cm long, with four to six ovules per sporophyll. The lamina is lanceolate, with spined dentate margins and an apical spine. The male cones are solitary, narrow ovoid, 25-30 cm long and 5-7 cm diameter, brown, the sporophylls 25-30 mm long with an upturned apical spine.
Habitat
This cycad grows in a hot, dry, climate, often in association with Eucalyptus and Livistona. It was first found on limestone soil, from which the name calcicola "lime-dwelling" derives, but is not confined to limestone, also occurring on soils derived from sandstone and schist.