My plants of M matudae have shorter spines which don't stick out from the body, enabling you to lift the plant by the body without being pricked. So based on my plants, no, it is not M matudae. I don't have a pic at present to show you. HTH.

Matthew, I'm not sure what Mamm it is but that's definitely no M. matudae.

Here's a pic of my two forms of matudae, the one on the left is the usual form, with one central spine pointing upwards and towards the growing centre of the plant, it lies flat against the body of the plant.
The plant on the right, you will note has two central spines, the second spine pointing outwards this is the form M. matudae v. serpentiformis fa. duocentralis.

This is a scan of a slide taken a couple of years ago with my old Pentax, this hopefully will give you a better view of the spines on the usual form....

Cheers CP

For those who are experiencing problems seeing my thumbnails, here they are in large format...

{{gwi:489305}}

{{gwi:489306}}

CP.

Looks basically like M. zeilmanniana, the arrangement of three straight red spines and a lower hooked one is quite distinctive. Check the flower colour, your's looks very dark red and M. zeilmanniana is usually quite pale.

Matthew, another Definitely Not matudae opinion.

CP. great pics. My wife calls my large matudae 'the hippy plant' for its annual annular display of a purple wreath of flowers on its head :)

Looks like my M. duoformis,
Dan
BTW, How do you all paste pictures onto your messages?

Here is a link that might be useful: M. duoformis

I like everyones pics here. A happy bunch.

Dawn

M. duoformis looks like a very good match.

Dan, I use photobucket but I think it is the same as webshots. Go to where you store your pics on webshots. Right click and copy the "tag" url. Make sure you copy the whole thing. Type out what you want to say than hit enter to start a new line. Then paste it to your message.
{{gwi:485015}}

I hope this helps.

Dawn

Dawn, you lucky, lucky, lucky lady, (drools prolifically), I love Mamm humboldtii, but I never see it on any plant lists here... seeing your pic induces an attack of the "wants". :)

CP

Here is a pic of my M. duoformis.
http://image18.webshots.com/19/7/86/39/355178639UFqIPc_ph.jpg
Dan