C. walkeriana 'Pendentive' no longer.

[Roy]

Extract from the July - Sept 2016 Orchid Registrations Docs just released. Can be read on-line.

Attribution of Cattleya ‘Pendentive’ The identity of the plant used as a grex parent and usually called Cattleya walkeriana ‘Pendentive’ has been the subject of much debate, and it transpires that the evidence suggests it is a selection from Cattleya x dolosa, a hybrid of Cattleya walkeriana x C. loddigesii. There are about 40 registered grexes currently listed as having Cattleya walkeriana ‘Pendentive’ as a parent, and at least a further 25 with C. walkeriana var. alba cultivars, apparently representing variously introgressed hybrids, which also segregate in the same clade as C. x dolosa in an analysis by Jin et al., (J. Japan Soc. Hort. Sci. 73(5): 496–502. 2004). These register entries have been changed to show Cattleya x dolosa as the parent instead. Genuine Cattleya walkeriana var. alba has no yellow on the lip; the yellow blotch is inherited from C. loddigesii. Breeding work has revealed that plants with a pale yellow colour on the lip near column are C. x dolosa. Cattleya x dolosa contains the following grexes: C. Angel Walker, C. Colorado Morado, C. Cosmo-Hiroto, C. Hallie Rogers, C. Heathii (1), C. Karin Martin, C. Little Angel, C. O’Brieniana, and C. Snow Blind

[Leafmite]

Thanks! Looks like I need to change a name!

I bought one of these:

Orchids By Hausermann: Cattleya walkeriana var. alba 'Pendentive' AM/AOS

I've known about the debate but I really love Cattleya walkeriana and the hybrids (I have a dolosa) so I bought it despite knowing it could go either way. I think it is a beautiful orchid.

Great to know it has finally been resolved!

[naoki]

Roy, do you have the link?

Are there any new & better scientific evidences than Jin et al. (2004)? RAPD analysis by Jin et al. is not conclusive about the hybrid origin of Pendentive (I can read Japanese, and I understand the genetics since it's my profession). On contrary to what you said, they did not have C. x dolosa in the analysis. Knowing the natural variation within C x. dolosa would have helped a lot. They did have C. Angel Walker, which is >50% C. walkeriana. Even compared with C. Angel Walker, 'Pendentitive' & 'Orchidglade' was closer to the C. walkeriana clade than to C. loddigesii. From the data, we can't preclude the possibility that 'Orchidglade' could be C. x dolosa with a higher proportion of C. walkeriana (via back cross). But it is misrepresenting to say that their data support that these cultivars were indeed C x. dolosa, especially after you look at the high diversity within C. walkeriana. It is likely that 'Orchidglade' was C. x dolosa, but I just wanted to mention that Jin et al.'s data shouldn't be misrepresented. In this era of genomics, it is pretty easy to do a better analysis than RAPD markers, so I hope that they are basing the conclusion on better data.

[Roy]

The extract I posted is the entire thing naoki. I believe more will come out. Some info I received from a question I raised about some supposed walkeriana's out here really opened a can of worms. All the info apparently was ready to assemble & come up with what I posted but for some reason wasn't. Now it is. I'll post the link, just click on the Jul=Sept Reg's link & scroll way down to attached letters & notes etc. But you'll only get what I posted. I did it so no=one could say I altered the text.

https://www.rhs.org.uk/about-the-rhs...d-hybrid-lists

I think there will be more info published next year but can't be sure.

[naoki]

Thank you, Roy. It is pretty sketchy, I wish they represented the paper more accurately. From Jin's paper, the similarity between tipo and Orchidglade derivatives (around 0.73-0.74) are only slightly lower than the similarity between tipo and a couple of semi-alba (Tokyo No.1 etc, around 0.75). The similarity between C. walkeriana tipo and C. Angel Walker is much lower (around 0.69).

Also in their last statement, are they mixing up the natural hybrid (C. x dolosa) with a bunch of artificially created hybrids? Hopefully, they are just stating that these artificial hybrid grexes are derived from C x. dolosa.