Cycas edentata de Laub., Blumea 43: 373 1998. (Syn: Cycas circinalis f. maritima J.Schust.; Cycas litoralis K.D.Hill);

Images by Surajit Koley

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This species is widespread and locally common in much of southeast Asia. Subpopulations are found in Indonesia, Malaysia, Myanmar, Philippines, Thailand and Viet Nam. 

This species occurs only along shorelines, in full sun to moderate shade often in dry littoral scrub on beach sand, stabilized coastal sand dunes or rocky headlands, often in very shallow soil and apparently over both granite and limestone substrates.  

Citation: Osborne, R., Hill, K.D., Nguyen, H.T. & Phan, K.L. 2010. Cycas edentata. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 08 September 2014.


 

 

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IBG today : Cycas sp. 01 : 5 posts by 3 authors. Attachments (5).
This may be the same species I have posted recently https://groups.google.com/forum/#!topic/indiantreepix/1ke2hMkykZg, but I am not sure, they all look alike.

Leaves are around 4 to 5 ft long and leaflets are about 1 ft.


Isn’t it Cycas rumphii?


Thank you …, I am not familiar with cycads. To my very little understanding it does fall in C. rumphii complex. FoP equates it with Cycas circinalis sensu Roxb. non L., illustrations can be found at http://www.efloras.org/object_page.aspx?object_id=1200&flora_id=2 and http://www.plantillustrations.org/illustration.php?id_illustration=180753&height=1080 which shows teeth on lamina of megasporophyll.

Instead, C. rumphii subsp. zeylanica seems to have obscure teeth and long acuminate apices, Can it be Cycas zeylanica (J.Schust.) A.Lindstr. & K.D.Hill?
Furthermore, there is a description and pictures of another Cycas, in a pdf file – https://groups.google.com/forum/#!topic/indiantreepix/7Yvt09vH5n8 …… can it be that plant?


A document of ‘Cycas in India’ can be downloaded from – https://groups.google.com/forum/?fromgroups#!topic/indiantreepix/fAAiOFfD_Dg

Another, ‘The genus Cycas (cycadaceae) in Indonesia’ can be downloaded from http://www.cycad.org/documents/descriptions/Cycas/Cycas-montana.pdf
Both the above files document Cycas rumphii, C. edentata (previously C. rumphii, syn. C. litoralis), C. sphaerica Roxb., in addition to other species. KEYs are given along with illustrations & descriptions of megasporophylls.
After going through those two docs. I think it is not C. zeylanica, where leaflets are widely spaced.
For its narrower falcate leaflets, megasporophyll without lateral spine & longer apical spine (14-40 mm against 10-25 mm) I think it is C. edentata de Laub. I think the pictures of petiolar spine, cataphylls, megasporophylls in this thread look similar to –
I hope i haven’t made any grave mistake.


  
 
 

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