Photography credit: Andy Easton

Hybridizing Notes: Odm. Extraria × Oda. George McMahon

Oncidium Alliance

by Andy Easton

Originally published in The International Odontoglossum Alliance Journal , Supplement Spring 2020 in 2020

Posted by Sys Admin 10 months ago.

This article references Odm. Extraria, Oda. George McMahon, Odm. Parade.
Article Blog   Article Index

Registered in 1920, Odm. Extraria (Odm. crispum × Odm. laeve) went nowhere. But a David Stead remake at Mansell & Hatcher introduced us to the alba strain of Odm. Extraria and it is a handsome thing. Bob Hamilton secured one of the remakes and has used it cleverly. He may also have made a misstep. As Bob's missteps are rare, read on and be reminded that orchid hybridizing has many traps. The first hybrid we have bloomed a ton of is Odm. Extraria alba × Oda. (Odm. Parade × Oda. George McMahon) + Oryzalin. They are floriferous, 100% albas, shapely, with many tending greenish especially when the flowers are fresh. I became immediately fascinated with the hybrid. But....... both the diploid and tetraploid forms are not really acceptable in their flower longevity. The tetraploids last longer, of course, but still not long enough and there's little less attractive to my eye than an inflorescence that is essentially dying in the middle. Then there is the crossing pictured, Odm. Extraria alba × Oda. George McMahon where 25% come as alba yellows. Some of this cross also have flower longevity issues and some do not. So what's going on? Well it's all quite simple when you think it through. Oda. George McMahon is a fertile triploid. I suspect that the flower life of Odm. Extraria alba is not generous. So when two diploid gametes match up, the resultant diploid progeny have fairly shortlived flowers. But when Oda. George McMahon produces a n+n+n gamete and this seems to happen fairly frequently, the resulting 4n seedling has much more Oda. George McMahon influence and it lasts a much longer time. That's my rationalization of what is happening but someone who knows more about genetics may see things differently.

Share on Social Media:  
Log in to Add a Comment

New Topics

  1. Rae Walker asked question Name help in category General Discussion
  2. John Small asked question Schomburgkia, species or hybrid in category General Discussion
  3. Robert H. Findlay asked question Help with ID of this Eria sp. in category General Discussion
  4. Osura Mindula Gunasena asked question Help to Identify the Id of this Vanda in category General Discussion
  5. Maricarmen Ferreira asked question Care for Myl Quest Fanguito in category General Discussion

New Comments

  1. Robert H. Findlay commented on topic "Help with ID of this Eria sp." by Robert H. Findlay
  2. Carol Holdren commented on topic "Name help" by Rae Walker
  3. Carol Holdren commented on member plant Dtps. Younghome Little Spirit by Heather A
  4. Sara D commented on member plant Den. Green Mist by Sara D
  5. Sara D commented on member plant Phal. bellina var. Coerulea by Sara D
  6. Sara D commented on member plant Pot. Marie Yellow Bird var. Love Love by Sara D
  7. John Small commented on topic "Lady Bug or dangerous bug" by John Small
  8. Carol Holdren commented on topic "Help to Identify the Id of this Vanda" by Osura Mindula Gunasena
  9. Carol Holdren commented on topic "Care for Myl Quest Fanguito " by Maricarmen Ferreira
  10. Roberto Lizama commented on topic "Help to idenficate this orchid" by Roberto Lizama
  11. Mark Ashworth commented on topic "Orchid species search" by Mark Ashworth
  12. Debbie Chase commented on topic "Head on Shot to be Identified" by Debbie Chase
  13. Carol Holdren commented on member plant Phal. Liu's Cute Angel by Mo Chen
  14. Mo Chen commented on member plant Holc. flavescens by Mo Chen
  15. Carol Holdren commented on topic "Identify Orchid" by Debbie Chase
  16. Nilda Vega commented on member plant Bct. Roman Holiday 'Hamlyn' by Terence Kew
  17. Clint Dalrymple commented on member plant Pnr. graminifolia by Clint Dalrymple
  18. Carol Holdren commented on member plant Rth. Beau's Golden Touch 'Touch of Class' by Robert Rand
  19. Robert H. Findlay commented on member plant B. nodosa 'Remar x Mas Mejor' by John Small
  20. Carol Holdren commented on member plant Phal. buyssoniana by Robert Oceans