Help me ID these stocks

[Shane]

I bought some new stocks online and now I'm trying to figure out which is which (they came unlabeled). I ordered Harrisia jusbertii and Selenicereus sp (I believe it's pteranthus based on what the seller had on hand)

20200103_185326-1209x906.jpg (143.66 KiB) Viewed 2773 times

The ones in the left look like Selenicereus pteranthus, so I guess that makes the others Harrisia jusbertii. But they don't quite look right based on the pictures I've found. What are your thoughts?

[7george]

These on the left should be Selenicereus, it has aerial roots. Young shots or seedlings of Harrisia jusbertii may look different from typical ones used for grafting. Could be these on the right if the sender is correct.

[Shane]

These on the left should be Selenicereus, it has aerial roots

I was thinking that too

Young shots or seedlings of Harrisia jusbertii may look different from typical ones used for grafting

That would make sense. For the record, I think the seller is trustworthy and has sent me the correct plants, I was just asking more because I wasn't sure what I was looking at

[Shane]

I looked at the Harrisia areoles more closely and they do look a lot like pics of Harrisia on the internet

[DaveW]

Only one that looks like it could be Harrisia jusbertii to me, but hard to tell from small image, is in your first picture at bottom second from left. H. jusbertii is pretty distinctive with it's short awl shaped spines. See:-

https://www.cactus-art.biz/schede/HARRI ... bertii.htm

H. jusberti looks different to all the other Harisia's since it is probably originally a hybrid or sport that has never been found again in habitat. A hardy grafting stock though. Better for use in the UK than Myrtillocactus which is not winter hardy if the temperature drops towards freezing.

[Shane]

Only one that looks like it could be Harrisia jusbertii to me, but hard to tell from small image, is in your first picture at bottom second from left [...]

You can't see it in the picture, but that plant actually has aerial roots, so it's not Harrisia. I think it's one of the Selenicereus (I think the entire left group is Selenicereus pteranthus)

If the plants on the right aren't H. jusbertii, any guesses as to what they are?

[Shane]

Over the months since I posted this, I'd come to the conclusion the "Harrisia" cuttings were not Harrisia at all but something else. Flash forward to today, and I saw this new growth. I'll be darned, looks like is H. jusbertii and the seller's ID was correct the entire time

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It looks like it transitioned from juvenile to adult growth recently. Surprised how sharp the transition was

[Hanazono]

Yes your seedlings are H. jusbertii.
H. jusbertii is a good parmanent stock for young seedling grafting.
A scion grafted on a jusbertii stock will give very early flowering and open many flowers at onece.
Some years ago, I used this stock character and built up my cacti collection.

3 years old jusbertii seedlings can be used as grafting stocks.
Since H. jusbertii is a hybrid, you can not make any seeds by jusbertii x jusbertii.
If you want to get seeds, you need jusbertii x any Echinopsis.
All seedlings propagated from the above process are just H. jusbertii.

The attached photo is scions with jusbertii stocks in my greenhouse.