[AB_images] Crinum Niagra Park - Peeping Tom

annejim annejim@acay.com.au
Mon, 19 Jan 2004 22:46:06 PST
Hi David,

 The question  you raised about  x Powellii hybrids and  their ability 
to be used in further breeding  was answered some years ago by  Les 
Hannibal and his contemporaries.  The problem of  being able to produce 
F1 hybrids and  finding that hybrid sterility  prevents  the  F2 stage 
where you would expect to find  the expression of some  recessive 
qualities has been   a confounding factor in Crinum breeding.   He found 
that  reverse back crosses using  x powellii pollen on to select forms 
of  C. moorei   or C. bulbispermum  was feasible with some grexs and 
that many of the progeny of these crosses were vigorous and  themselves 
seed viable eg. C. 'Virginia Lee' and C. 'Cecil Houdyshel' (C. moorei 
var makoyanam x C. bulbispermum album). 
An example of the backcross is  C. Janice Gale =  C. Cecil Houdysel x C. 
bulbispermum 'Sacramento'(polyploidal). Les Hannibal advocated that the  
best option is to use or create polyploidal hybrids as these more often 
retain  seeding fertility. 

Some of these x powellii hybrids may add other complexities,  for 
instance he mentioned that C.'Cecil Houdyshel' ( an amphiodiploid 
hybrid) if selfed, yields polyploidal moorei forms and sterile plants 
looking like C. bulbispermum album. .
David Fenwick mentioned  that  many colour forms of  x powellii were 
created around 1900 by the Belgium nursery Van Tubergen  , - it is known 
that they made use of the form of  C. moorei  called var makoyanam  that 
was dark coral pink coloured  with very robust foliage and growth for 
the majority of their pink x powellii  cultivars and that in these 
instances C. moorei was the seed parent.

Hence the use of  large  vigorous hybrid  forms is favoured for this 
approach and the fact that they have been amply created in the past can 
be noted from the Crinum hybrids you have been finding  in  the older 
garden scape of Sydney and the Central Coast.  I have recently read that 
Les as well as other Crinum hybridisers also made use of mutating 
chemicals  on Crinum hybrid seeds in order to induce polyploidy.

It appears that there are a lot of  these x powellii backcrosses crosses 
in the USA that have been given other hybrid and  grex names and are 
hence disguised in relation to their x powellii origins. 


Jim Lykos
Blue Mountains
Zone 9b/10

David Sneddon wrote:

> Howdy,
> Here is a picture of a crinum I obtained from Niagra Park, Central 
> Coast, NSW, Australia.
> The flowers are at just the right height to be peeping toms (looking 
> over the fence)!
> (Don't forget to read the comments on the pictures)
> http://ausbulbs.org/bulbgal/details.php/… 
> <http://ausbulbs.org/bulbgal/details.php/…>
> http://ausbulbs.org/bulbgal/details.php/…
> The flower looks similar to the plant I found at Pt Claire (recently 
> posted), but I think the foliage is different.
> Note I believe this one sets seeds.
> Regards, David.
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