Search found 1242 matches

by Karl K
Sat Apr 27, 2019 4:31 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 25
Views: 1062

Re: R. davidii

It is not similar to my supposed R. virginiana, which are in turn nearly indistinguishable from R. carolina (both of those two came from Lawyer Nurseries). Erlanson (1934) published a key to American roses. http://bulbnrose.x10.mx/Roses/breeding/species.htm R. virginiana : Stems stout, much branche...
by Karl K
Sat Apr 27, 2019 12:19 am
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 25
Views: 1062

Re: R. davidii

Rosa davidii is reportedly closely allied to R. macrophylla. In fact, it has even been regarded as a variety of that species. Here is a characteristic that should distinguish the two: exserted styles. Rosa davidi  Crép. Bull. Soc. Roy. Bot. Belgique xiii. (1874) 253. Si les styles sont normalement ...
by Karl K
Tue Apr 23, 2019 11:46 am
Forum: Rose Hybridizers Association Forum
Topic: tissue culture
Replies: 9
Views: 361

Re: tissue culture

Before I forget again, Kane (2000) wrote about micropropagation of roses. One comment is particularly interesting (I think). "Many miniature rose cultivars display vigorous growth when established in vitro ; the actual response is highly cultivar dependent." http://bulbnrose.x10.mx/Roses/breeding/Ka...
by Karl K
Mon Apr 22, 2019 8:29 pm
Forum: Rose Hybridizers Association Forum
Topic: tissue culture
Replies: 9
Views: 361

Re: tissue culture

Some plants can be propagated by leaf cuttings, as most gardeners know. It hadn't occurred to me that roses might be among them. Parsons (1847) Some years since, Lecoq, a French cultivator, conceived the idea of endeavoring to propagate roses by the leaf. He gathered some very young leaves of the Be...
by Karl K
Mon Apr 15, 2019 2:24 pm
Forum: Rose Hybridizers Association Forum
Topic: Bellecom x OP
Replies: 7
Views: 260

Re: Bellecom x OP

http://bulbnrose.x10.mx/Roses/breeding/basye/gillette.htm Basye (1985) 65-626 = ((( R. carolina x Hugh Dickson) x OP) x OP) "My record book shows that in 1961 I made a somatic chromosome count of the mother of 65-625 and found it to be 28. Apparently I never got around to making the count for 65-626...
by Karl K
Mon Apr 15, 2019 1:12 am
Forum: Rose Hybridizers Association Forum
Topic: Open pollinated seedlings from F1 carolina X gallica
Replies: 14
Views: 1615

Re: Open pollinated seedlings from F1 carolina X gallica

I bought R. soulieana from Moore, 25 years or so ago. What I got looked more like R. wichuraiana, or something akin to it.
by Karl K
Sat Apr 13, 2019 12:50 pm
Forum: Rose Hybridizers Association Forum
Topic: Is sterility sometimes a physical problem, and not genetic?
Replies: 5
Views: 221

Re: Is sterility sometimes a physical problem, and not genetic?

Years ago I found that 'Blush Noisette' never set hips unless I pollinated the flowers by hand. Those little petals covered the stigmas, and most of the stamens. The excessively double Rosa roxburghii can be pollinated by hand (as I learned by experience) but a bumblebee I once saw visiting such a f...
by Karl K
Wed Apr 10, 2019 7:42 pm
Forum: Rose Hybridizers Association Forum
Topic: Species-Modern Crosses
Replies: 109
Views: 17640

Re: Species-Modern Crosses

I found this today and wanted to put it somewhere appropriate. This is another fallout from Bieberstein's attempt to match a plant from the rocky southern Taurus with something already published. His first (mis)attempt was to call the plant Rosa provincialis . Transactions of the Massachusetts Horti...
by Karl K
Mon Apr 08, 2019 2:38 pm
Forum: Rose Hybridizers Association Forum
Topic: Unreduced pollen in roses
Replies: 4
Views: 184

Re: Unreduced pollen in roses

A little off-topic, David, but in the case of unreduced pollen from a diploid creating a polyploid, are those polyploids likely to have any more cold-hardiness than their diploid seedlings? I recall reading that polyploid species are more common in colder climates, but don't recall the supposed rea...
by Karl K
Mon Apr 08, 2019 10:30 am
Forum: Rose Hybridizers Association Forum
Topic: Suitability question
Replies: 6
Views: 210

Re: Suitability question

I would find it hard to resist crossing 'Empereur du Maroc' with 'Charles Mallerin' and 'Papa Meilland'. Love the deep, deep crimson and heavy perfume.
by Karl K
Sun Apr 07, 2019 6:16 pm
Forum: Rose Hybridizers Association Forum
Topic: Suitability question
Replies: 6
Views: 210

Re: Suitability question

Hi there, I have never crossed roses before but this spring I am planning to try it. At the moment (I'm in England and it's still quite cold) the two roses that look as if they are going to produce good early blooms are Souvenir de Malmaison and Emperor of Morocco (emperor d 'maroc). Does anyone kn...
by Karl K
Sun Apr 07, 2019 2:12 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 62
Views: 4113

Re: Under-utilized species you feel might have merit

It's possible the original double white he used may have had some fertility, but the ones we have here, now are a degenerative sport which has been propagated forever until that's all we have. But there have been exceptions, such as "The Monster", bred from R. banksiae banksiae x Old Blush. It may ...
by Karl K
Sun Apr 07, 2019 11:46 am
Forum: Rose Hybridizers Association Forum
Topic: Erinnerung an (souvenir de) Brod?
Replies: 12
Views: 990

Re: Erinnerung an (souvenir de) Brod?

While I'm on this, I want to mention a couple of items that came up while I was googling for info on 'Erinnerung an Brod'. Shrub roses of today (1963) Page 134 Gordon D. Rowley  Erinnerung an Brod. Geschwind, 1886. 'Souvenir de Brod.' Brod is a town in Bosnia. Supposed to be a hybrid between R. rub...
by Karl K
Fri Apr 05, 2019 10:44 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 62
Views: 4113

Re: Under-utilized species you feel might have merit

... and it is possible that the species' health breaks down quickly upon dilution with foreign genes. Stefan This is something I've thought about. For instance, Rosa wichuraiana is very resistant to mildew, but 'Gardenia' [ R. wichuraiana x Perle des Jardins] is susceptible. To be fair, 'Gardenia' ...
by Karl K
Fri Apr 05, 2019 9:48 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 62
Views: 4113

Re: Under-utilized species you feel might have merit

When I took my dog out for his crack-of-dawn walk, I picked some flowers from a double yellow Banksiae growing down the street. When I got home and had a close look, I found no stamens at all. I can't tell whether the styles are there at all. I really need a dissecting microscope to do this kind of ...
by Karl K
Thu Apr 04, 2019 1:38 pm
Forum: Rose Hybridizers Association Forum
Topic: Under-utilized species you feel might have merit
Replies: 62
Views: 4113

Re: Under-utilized species you feel might have merit

The Banksiaes are in bloom in my area, so I wanted to make another pitch for them. Anyone who has inhaled the delicious violet perfume of R. banksiae banksiae will appreciate what a fine addition this scent could be to what we already have. And R. banksiae lutea may be our best shot at a yellow dwar...
by Karl K
Wed Apr 03, 2019 11:23 am
Forum: Rose Hybridizers Association Forum
Topic: Varying Germination with Differing Pollen Parents
Replies: 13
Views: 344

Re: Varying Germination with Differing Pollen Parents

Karl, how do we characterize what is "enough pollen to fertilize one flower" if a single pollen grain will do the trick? Or do we assume from this comment that most of the pollen collected was not viable? Something about this quotation doesn't smell right. Thanks Mike Mike, One grain of pollen does...
by Karl K
Tue Apr 02, 2019 4:09 pm
Forum: Rose Hybridizers Association Forum
Topic: Varying Germination with Differing Pollen Parents
Replies: 13
Views: 344

Re: Varying Germination with Differing Pollen Parents

I want to mention another fact that seems to get overlooked. When it comes to pollen, quantity counts. So does quality (diversity). Back in the 19th century, Naudin experimented with pollination of Mirabilis jalapa (four o'clock). Twelve flowers were given two grains of pollen. Only one seed formed ...
by Karl K
Tue Apr 02, 2019 1:29 pm
Forum: Rose Hybridizers Association Forum
Topic: Varying Germination with Differing Pollen Parents
Replies: 13
Views: 344

Re: Varying Germination with Differing Pollen Parents

And one other note with regard to germination and pollen parents...I think I posted about this a few years ago. I remember having R. foliolosa seed in the same flat from different pollen parents. Sown on the same day, the seeds of one pollen parent germinated a few days earlier than those of anothe...
by Karl K
Mon Apr 01, 2019 11:56 pm
Forum: Rose Hybridizers Association Forum
Topic: Erinnerung an (souvenir de) Brod?
Replies: 12
Views: 990

Re: Erinnerung an (souvenir de) Brod?

In a 1997 reprint of some of Geschwind's writings, I came across this interesting item: "In not too dry summer and soil the large, densely filled, flat flower is almost purplish-blue or violet-blue, usually with a dark red heart, and it is the only rose in this color that sometimes approaches a true...