How to make Harrisia jusbertii seeds?

[szjx81kris]

Any one know details?
Use echinopsis as pollinator?

[BrianMc]

Why not use two different flowering Harrisia jusbertii?


Or do you refer to the fact that Harrisia jusbertii is not considered pure Harrisa, but an intergeneric hybrid between Harrisia and Echinopsis?

If you are trying to recreate the cross I don't think you will be able to call the result H.jusbertii.

BTW, Harrisia jusbertii seed is available to buy from seed sellers.

[Phil_SK]

The parental details of Harrisia xjusbertii are not certain. To quote from Alan Franck's PhD thesis on Harrisia:

Harrisia ×jusbertii is a putative horticultural hybrid between an Echinopsis and a Harrisia (Berger 1905) with distinctively short (to 5 mm long), thick (~1–2 mm wide), conical blackish spines. Some characters are agreeable with H. bonplandii such as the red, dehiscent fruit with persistent scales, the green stem often lacking a well-defined sulcus, the acicular juvenile spines, and often having 4–5 ribs. The short mature spines of Harrisia ×jusbertii are also found in H. martinii and H. regelii. Young spines of Harrisia are often blackish at the base as in the spines of Harrisia ×jusbertii. It has been postulated that it is a chimeric mutant of H. bonplandii (Rowley 1980), though the morphology is quite consistent on a plant. Henke (1981) claimed to have produced this hybrid by crossing Echinopsis eyriesii Pfeiff. & Otto and Echinocereus pentalophus (DC.) Haage var. procumbens (Engelm.) P. Fourn., which seems extremely doubtful (Drawert 1983). This hybrid is unknown in the wild but it is widespread in cultivation, often used for a grafting stock. The name Harrisia ×jusbertii is more common in usage, though if it is indeed a hybrid with Echinopsis then ×Harrisnopsis is the preferred generic name. However, given the poor taxonomy of the likely polyphyletic Echinopsis and the uncertainty of its other hybrid parent, it may be ideal to retain use of Harrisia ×jusbertii until additional information is gathered. As all the vegetative characters are agreeable with Harrisia, even the short spines, it may well be an intrageneric hybrid of Harrisia. If so then Harrisia ×jusbertii is the proper name.

BTW, Harrisia jusbertii seed is available to buy from seed sellers.

I've germinated this seed from two different sources and it comes true, as far as be judged for such young seedlings.

This goes against my expectations that, assuming the parents of this seed were the f1 Echinopsis oxygona 'eyriesii' x Harrisia bonplandii, there would be a range of phenotypes in an f2 population. But if it's unknown in the wild then I don't see how it could be a stabilised hybrid. It's a puzzling plant.

[Ali Baba]

Polyploidy is common in plants. A tetraploid hybrid would produce seedlings identical to the parents