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 Any Ideas on this plant?

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PostSubject: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 1:44 pm

A member of the public brought this into the gardens during the week. I know what I think it might be but would like to hear suggestions.

Any Ideas on this plant? 2dspu8m
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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 1:49 pm

Probably spinosissima, but I need a closer look

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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 1:50 pm

the plant is about 2ft across (70cm). This is a close up of the spines. There are between 4 -6 brown spines per tubercle. There are no radial spines and plenty of dried flowers all the why down the heads but no fruit or seed pods

Any Ideas on this plant? 3131851
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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 1:55 pm

Now I have more doubts about this plant, I am not so sure anymore that it is in fact spinosissima.
Have you seen it in flower yet?

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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 1:59 pm

No I havn't seen it in flower yet. It only came in last week. I to thought it could be spinosissima, possilbe subsp tepoxtlana grown in poor light. Its hard to tell without flowers. It might not be a mamm at all !
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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 2:04 pm

I was tempted to say it might be a form of polythele, because of the cylindric and pendulent form, and the lack of radials. I think its safe to say that polythele is the only species in both the Heterochlorae (and Rhodanthae) and the Polyacanthae that has no radial spines.
But then I looked at the close-up again, and are you sure, Mark, that it has no radials. On the head to the right of the close-up, near the apex, just below (well above actually since its upside down!) a brown dried flower, I'm sure I can see a number of very short white spines on a number of tubercles. Its a little difficult to see, but I think they look more distinct that I would expect from just wool, although they are very short.
If that's the case, then I'd like to know how many, as I also don't think it is spinossima, which has lots of radials, and I've never seen one with such short radials.

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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 2:04 pm

Well spotted Chris. I did not see any radials and I had the plant in front of me. I have taken off some of the spine cuslters and there are 11 radials. Fine, white and just a few mm's long.
Mark
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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 2:07 pm

Thanks for the confirmation, Mark. I am still pretty uncertain, and have a couple of thoughts...
maybe verticealba (or rhodantha ssp mccartenii), or a straight spined version of nunezii...
but none really fit those very short radial spines. I end up thinking its a very unusual form or a hybrid. What do others think?

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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 2:08 pm

Hello Mark and Chris,

I was also thinking it is a rhodantha form, who spent most of his life in a darker zone than in a greenhouse.

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PostSubject: Re: Any Ideas on this plant?   Any Ideas on this plant? Icon_minitimeSat Jul 19, 2008 2:09 pm

9-7-08. The plant has now come in to flower and it would appear that both Chris and Hugo are correct in that it seems to be M.rhodantha. I would go has far to say that it is subspecies aureicpes apart from the spination which calls for golden - yellow spines. These are a dark red - brown colour but given the variable factors in both spines and flowers of many species it's not that much of a problem.

Any Ideas on this plant? 2wg556g
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