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Pollinations in 2006 using Rhododendron tomentosum as Seed Plant
Kristian Theqvist, 27-Oct-2007, rev. 001



I have continued my breeding program in 2006 using Rhododendron tomentosum (Marsh Tea) as seed plant and pollen from various lepidotes. I have documented the crossings done in 2003 on page Lepidote Crosses using Rhododendron tomentosum as Seed Plant, in 2004 on page Pollinations in 2004 using R. tomentosum as Seed Plant and in 2005 on page Pollinations in 2005 using R. tomentosum as Seed Plant.

The table lists the lepidotes that I have used as pollen giving plant in 2006.
The number of seeds for each cross is shown graphically in picture Number of Seeds.

Pollen parent

Subsection

 Origin of pollen

Seedpods swelling?
25-Jul-2006
Number of seeds
12-Oct-2006
Germination of seeds
out of max 30 seeds
burmanicum

Maddenia

 Jaakko Saarinen Yes 1/10
57 seeds
14/30 seed plants
dendrocharis

Moupinensia

 Own plant from Rhododendron-Haven Yes 2/10
65 seeds
8/30 seed plants
edgeworthii

Edgeworthia

 Jaakko Saarinen Yes 3/10
35 seeds
17/30 seed plants
fastigiatum C&H 7022

Lapponica

 Own plant from
Glendoick Gardens		 Yes 3/10
 41 seeds
8/30 seed plants
ferrugineum

Rhododendron

 Own plant from
Glendoick Gardens		 Yes 2/10
 115 seeds
14/30 seed plants
mucronulatum var. chejuense

Rhodorastra

Own plant from
Glendoick Gardens		 Yes 7/10
 43 seeds
8/30 seed plants
polycladum

Lapponica

 Own plant from
Glendoick Gardens		 Yes 5/10
 77 seeds
10/30 seed plants
tsaii

Lapponica

 Own plant from
Glendoick Gardens		 Yes 2/10?
 500 seeds!
9/30 seed plants
yungningense

Lapponica

 Own plant from
Glendoick Gardens		 Yes 4/10
 400 seeds!
9/30 seed plants
'Charme La' minus Carolinianum Group x pemakoense Patulum Group

Caroliniana x Uniflora

Own plant from Hachmann Yes 5/10
 200 seeds!
20/30 seed plants
Emasculated, non-pollinated covered control truss with 20 stigmas - - Yes, some
a lot of small non-viable looking seeds
2/30 seed plants

I made a total of 10 crossings of which all gave seed. Most seed came out of the crosses with Lapponica subsection lepidotes tsaii and yungningense.
The hybrid 'Charme La' gave surprisingly good amount of seed. Previous results with hybrids have not been encouraging, except with the Lapponica subsection hippophaeoides hybrid 'Flämingperle' in 2005. The number of seeds for all crosses is shown in the graph of figure 1.

Number of seeds

Figure 1. Number of seeds from the crosses.




I'll report on the growth of the seedlings on this page whenever something worthwhile reporting happens.

Lepidote Crosses in 2003 using Rhododendron tomentosum as Seed Plant
Pollinations in 2004 using Rhododendron tomentosum as Seed Plant
Pollinations in 2005 using Rhododendron tomentosum as Seed Plant
Hybridity of lepidotes in Rhododendron subsection Ledum based on some hybridization results
Taxonomy of species in Rhododendron subsection Ledum
Breeding Hardy Elepidote Rhododendrons in Finland