November 2015 - Genus of the Month - Small Opuntias

January 2017 - Genus of the Month - Lepismium
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RAYWOODBRIDGE
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by RAYWOODBRIDGE »

Nice ones Phil; :grin: O.K Tony we are coming out of the closet :shock:

I wish I had taken more pictures during the summer :sad:

And the last ones from me. :?:
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by cornelid »

And a few from me taken this evening under an led flood light, in my dark greenhouse, using a mobile phone. Some are looking a little slim due to the winter rest.

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Pterocactus tuberosus (kuntzei)

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Opuntia fragilis

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Tephrocactus articulatus v. papyracanthus

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Opuntia microdasys var. albispina

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Opuntia rufida
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by cornelid »

And some more
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all small at the moment, but won't necessary stay that way!
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Tony R »

Following on from Phil's posting on the previous page, here is the one flower I had on my A. pachypus this year, a couple of weeks ago on 9th November. Sometimes the flowers don't open before Christmas and struggle to open, or even abort, in the following January. Yes, rooting the vegetative 'fruits' is a good way of propagating new plants - below are two of my fruits from a previous year again photographed earlier this month.
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Phil_SK »

Cumulopuntia boliviana is treated in the New Cactus Lexicon and widely elsewhere as consisting of four subspecies, boliviana, echinacea, dactylifera and ignescens. C. boliviana ssp echinacea is one of the few South American opuntia taxa that I've only ever seen in photos of plants in habitat... is anybody growing it? The name is very approriate for the small black hedgehogs. It lives in a small area on the Peru/Chile border. C. b. ignescens also lives on the west of the Andes but in a bigger sweep. Big clumps, with their long, upright golden spines, look like grass tussocks when seen in habitat. On the eastern side of the Andes, I struggle to see a good distinction between ssp boliviana and dactyifera. These plants seem more common in cultivation and stringy specimens sometimes pop up in garden centres.

Does anybody know why we're calling these boliviana, by the way? Opuntia boliviana and pentlandii were published simultaneously by Salm-Dyck in Allgemeine Gartenzeitung in 1845 (the order in which they appear in the publication doesn't matter).
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Britton & Rose decided they were the same thing and decided to call it O. pentlandii in their The Cactaceae.
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Given that the ICN states that
11.5. When, for any taxon of the rank of family or below, a choice is possible between legitimate names of equal priority in the corresponding rank, or between available final epithets of names of equal priority in the corresponding rank, the first such choice to be effectively published (Art. 29–31) establishes the priority of the chosen name, and of any legitimate combination with the same type and final epithet at that rank, over the other competing name(s)
it's puzzling that we're not using pentlandii as they did. Is there an earlier synonymisation?
Phil Crewe, BCSS 38143. Mostly S. American cacti, esp. Lobivia, Sulcorebutia and little Opuntia
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Phil_SK »

Anyway, here are some boliviana ssp boliviana/dactylifera types.
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Phil Crewe, BCSS 38143. Mostly S. American cacti, esp. Lobivia, Sulcorebutia and little Opuntia
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Phil_SK »

And some small ssp ignescens (I think!)
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Phil_SK »

C. rossiana is worth growing as it flowers easily when small although there is a huge plant that does the rounds at BCSS shows.
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The plant known as rossiana or pentlandii v. fuauxiana fits in here too, a really good plant to grow, I think.
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Phil_SK »

C. chichensis seems very close to boliviana but has managed not to be subsumed into it so far.
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the second plant seems to suffer the fate of many plants in cultivation where repeated propagation from immature plants results in smaller and smaller segments. I'm hoping it may grow up to be as big as the first plant.
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Re: November 2015 - Genus of the Month - Small Opuntias

Post by Phil_SK »

Not many photos of my other Cumulopuntia as they had an accident :roll: and are young restarts from bits.
A rather more bristly form of C. sphaerica/leucophaea than is usually seen.
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A close relative, C. zehnderi.
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Wrongly thought to be related to Maihueniopsis clavarioides, C. subterranea has been in lots of genera (don't get me started on the persistence of Puna). Mine grows at a ridiculous speed and couldn't be less subterranean if it tried. I think it may once have been grafted although it isn't now.
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My ssp. pulcherrima is flatter, for now. It has a bit of a rossiana appearance.
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Phil Crewe, BCSS 38143. Mostly S. American cacti, esp. Lobivia, Sulcorebutia and little Opuntia
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