Dasylirion longissimum

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Dasylirion longissimum

Post Number:#1  Postby GreekDesert » Sat Jan 04, 2014 2:59 pm

Dasylirion longissimum Lemaire is different from Dasylirion quadrangulatum
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Re: Dasylirion longissimum

Post Number:#2  Postby Geoff » Mon Jan 06, 2014 11:31 am

I understand the experts say it is different... I am just unclear HOW it is different. Be nice to see some photos of these side by side.
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Re: Dasylirion longissimum

Post Number:#3  Postby GreekDesert » Mon Jan 06, 2014 12:28 pm

One of the differences of Dasylirion longissimum and Dasylirion quadrangulatum are
the leaf characters.The leaves of Dasylirion quadrangulatum are quadrangulate, the
leaves of Dasylirion longissimum are not quadrangulate (picture 2).
D. quadrangulatum has no prickles on the leaves but D. longissimum has a few near
the spoon.
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Re: Dasylirion longissimum

Post Number:#4  Postby mickthecactus » Fri Apr 24, 2015 2:07 am

I grew this from seed years ago. It is the world's slowest growing plant......
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Re: Dasylirion longissimum

Post Number:#5  Postby Paul S » Fri Apr 24, 2015 6:25 am

Typically Dasylirion longissimum is much scruffier in appearance than its more northern cousin and has a thinner trunk.

D. longissimum

Image

D. quadrangulatum

Image

In the field they are easy to tell apart - the populations are a few hundred km apart!

I would have said, though, that the leaves are quadrangulate - certainly from the middle to the end. Maybe flatter nearer the spoon. Also the prickles are generally only at the very base of the leaves right by the spoon. The plant in your pic actually looks more to me like a hybrid - the prickles are very pronounced and the leaves quite flat. Hybrids do occur - both naturally and in cultivation - I have one that came from a batch of D.q. seeds that started life just as yours looks now.
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Re: Dasylirion longissimum

Post Number:#6  Postby Shmuel » Sun May 10, 2015 11:46 am

Not quite sure how to post this, but here is a photo of D. longissimum herbarium specimen from Kew. http://apps.kew.org/herbcat/getImage.do ... K000524955

Note that the 1902 collection name was D juncifolium.
Trouble is that http://www.theplantlist.org/tpl1.1/record/kew-303968 calls D juncifolium a synonym of D quadrangulatum. Maddening.

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