Cycas canalis: Difference between revisions
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| species = '''''C. canalis''''' |
| species = '''''C. canalis''''' |
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| binomial = ''Cycas canalis'' |
| binomial = ''Cycas canalis'' |
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| binomial_authority = K.D.Hill |
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==Description== |
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'''''Cycas canalis''''' is |
'''''Cycas canalis''''' is a species of [[cycad]] in the genus ''[[Cycas]]'', native to northern [[Australia]] in the northwest of [[Northern Territory]], where it occurs in two areas, on the coast at [[Channel Point, Northern Territory|Channel Point]], and inland in the [[Daly River, Northern Territory|Daly River]] area near [[Dorisvale]]. |
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The stems are erect, growing to 3-5 m tall and 7-14 cm diameter. The [[leaf|leaves]] are blue-green fading to green, 60-105 cm long, pinnate, with 100-170 leaflets. The leaflets are 10-20.5 cm long and 4.5-8 mm wide, and lie flat or in a shallow 'v'-shape on either side of the leaf stem. The [[petiole]]s are 15-25 cm long, and armed with sharp spines for most of their length. |
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Female cones open, with [[pendent]] [[sporophyll]]s, with gray and orange [[tomentose]]. 2-4 ovules per sporophyll. Triangular [[lamina]] toothed and with apical spine. [[Sarcotesta]] orange, [[sclerotesta]] flatterned ovoid. Male cones solitary, [[ovoid]], 15-22 cm long, 8-11 cm in diameter. Fine orange tomentose present, with erect apical spine. |
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The female [[strobilus|cones]] are open, with [[sporophyll]]s 16-25 cm long, with two to four ovules per sporophyll. The lamina is lanceolate, with spined dentate margins and an apical spine. The male cones are solitary, ovoid, 15-22 cm long and 8-12 cm diameter, orange, the sporophylls 35-45 mm long with an upturned apical spine. |
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==Habitat== |
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This cycad us native to [[Northern Territory]], [[Australia]] in coastal areas in [[Eucalyptus]] woodlands, south of Channel Point to the [[Daly River]]. The plant was only recently described in 1994 and little is known of the conservation status, popualtions and reproduction times. |
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Two [[subspecies]] are recongnised: |
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*''Cycas canalis'' subsp. ''canalis''. Coastal. Leaves flat, 60-90 cm long. |
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*''Cycas canalis'' subsp. ''carinata''. Inland. Leaves moderately 'v'-shaped, 70-105 cm long. |
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==References== |
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*[http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/cycadpg?taxname=Cycas+canalis Cycad Pages: ''Cycas canalis''] |
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*[http://www.iucnredlist.org/search/details.php/42023/all IUCN Redlist: ''Cycas canalis''] |
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[[Category:Cycads]] |
[[Category:Cycads]] |
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Revision as of 11:50, 2 October 2006
| Cycas canalis | |
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| Species: | C. canalis
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| Cycas canalis K.D.Hill
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Cycas canalis is a species of cycad in the genus Cycas, native to northern Australia in the northwest of Northern Territory, where it occurs in two areas, on the coast at Channel Point, and inland in the Daly River area near Dorisvale.
The stems are erect, growing to 3-5 m tall and 7-14 cm diameter. The leaves are blue-green fading to green, 60-105 cm long, pinnate, with 100-170 leaflets. The leaflets are 10-20.5 cm long and 4.5-8 mm wide, and lie flat or in a shallow 'v'-shape on either side of the leaf stem. The petioles are 15-25 cm long, and armed with sharp spines for most of their length.
The female cones are open, with sporophylls 16-25 cm long, with two to four ovules per sporophyll. The lamina is lanceolate, with spined dentate margins and an apical spine. The male cones are solitary, ovoid, 15-22 cm long and 8-12 cm diameter, orange, the sporophylls 35-45 mm long with an upturned apical spine.
Two subspecies are recongnised:
- Cycas canalis subsp. canalis. Coastal. Leaves flat, 60-90 cm long.
- Cycas canalis subsp. carinata. Inland. Leaves moderately 'v'-shaped, 70-105 cm long.