Search found 1246 matches

by Karl K
Sun Jul 14, 2019 12:02 pm
Forum: Rose Hybridizers Association Forum
Topic: Rootstocks and Flower Color
Replies: 24
Views: 1826

Re: Rootstocks and Flower Color

I'm finding similar results with several Teas here in the coolth of the Central Coast, Karl. I wonder how they would be in the higher inland heat? I had wondered about the accuracy of using Rosarium Uetersen for breeding as in the inland valley heat there were no sexual parts, only petals and petal...
by Karl K
Mon Jul 08, 2019 12:00 am
Forum: Rose Hybridizers Association Forum
Topic: Easy diploid seed parents
Replies: 15
Views: 563

Re: Easy diploid seed parents

Long ago I used 'Blush Noisette'. It did not set OP seeds in my garden, probably because the reproductive parts are hidden by petals. But it was fertile when I pollinated by hand. I also used 'Perle d'Or' a little, and 'Sweet Chariot'. The latter has tiny hips and very tiny seeds. A couple of years ...
by Karl K
Fri Jun 28, 2019 1:14 am
Forum: Rose Hybridizers Association Forum
Topic: Pier or Pierre Bugnet
Replies: 2
Views: 300

Pier or Pierre Bugnet

A picture of 'Pier Bugnet'
Oh, just a duplicate of the other link.
by Karl K
Thu Jun 20, 2019 1:45 am
Forum: Rose Hybridizers Association Forum
Topic: Rosa kweichowensis
Replies: 3
Views: 358

Re: Rosa kweichowensis

The plants in the photos do look more like Rubus than Rosa. The overexposed flowers aren't clear enough, but also suggest Rubus.

Rubus rosifolius is not exactly right, but close ... and introduced in China.
Image
by Karl K
Wed Jun 19, 2019 12:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Rosa kweichowensis
Replies: 3
Views: 358

Rosa kweichowensis

I have become aware of this rare species only recently. It is an odd looking thing that is reportedly a member of the small Microphyllae section, along with R. roxburghii and R. praelucens . It is a climber, but the styles (free, not exserted) do not suggest a connection with the Synstylae species. ...
by Karl K
Mon Jun 17, 2019 11:45 pm
Forum: Rose Hybridizers Association Forum
Topic: Nectar in Roses?
Replies: 3
Views: 240

Re: Nectar in Roses?

Where is this "nectariferous ring contracting its opening" supposed to be, Karl? Nice picture of R. minutifolia. The disk is the ring around the orifice (where the styles poke through). In Spiraea the hypanthium supports a nectar-producing "disk" which is ring-shaped and may have lobes as it does h...
by Karl K
Mon Jun 17, 2019 11:22 am
Forum: Rose Hybridizers Association Forum
Topic: Nectar in Roses?
Replies: 3
Views: 240

Nectar in Roses?

I have long believed that roses never produce nectar. That's what I've read many times. Insects that visit roses are there to collect pollen. This fact seems to explain why the "female" flowers of Rosa setigera produce some pollen. Without pollen, these flowers might be ignored. Heslop Harrison (192...
by Karl K
Fri Jun 07, 2019 12:51 pm
Forum: Rose Hybridizers Association Forum
Topic: Breeding for hardiness
Replies: 0
Views: 578

Breeding for hardiness

Hardiness is not a simple matter. Much of what passes for "winterkill" really results from plants that are still growing when the first frosts of winter hit, or when some cultivars are too anxious to start growing rapidly at the first sign of spring. The same sort of problems are encountered by grap...
by Karl K
Tue Jun 04, 2019 1:47 pm
Forum: Rose Hybridizers Association Forum
Topic: Four petals
Replies: 5
Views: 330

Re: Four petals

I enjoy these oddities and have a collection. Here are just three: an azalea, a hibiscus, and an iris. http://bulbnrose.x10.mx/Heredity/FreakyFlowers/azalea4.jpg http://bulbnrose.x10.mx/Heredity/FreakyFlowers/Hibiscus4.jpg http://bulbnrose.x10.mx/Heredity/FreakyFlowers/Iris4.jpg I do have a pic of '...
by Karl K
Fri May 31, 2019 5:14 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 25
Views: 1073

Re: R. davidii

Here is a comment about R. carolina that might be useful. Bull. Torr. Bot. Club 14(12): 253-256 (Dec 1887) Remarks on the Group Carolinae of the Genus Rosa By G. N. Best, M.D. The mature fruit has not received the attention it deserves; likewise the seed. I am satisfied that from them both important...
by Karl K
Thu May 30, 2019 2:17 pm
Forum: Rose Hybridizers Association Forum
Topic: what a species is, or isn't
Replies: 25
Views: 3897

Re: what a species is, or isn't

Whenever I'm searching for one thing, I encounter something else that is at least as interesting. Here's one that has a bearing on the nature of the Species: What is a genus? Turns out there is no pat answer. More interestingly, I think, there are mechanisms that are at work in separating subgenera ...
by Karl K
Fri May 24, 2019 1:26 pm
Forum: Rose Hybridizers Association Forum
Topic: Epigenetic Program
Replies: 1
Views: 188

Re: Epigenetic Program

Re: vegetative selection. As I discussed in my last note, the ability to respond to vegetative selection (for good or ill) seems to decline with age. In other cases, some strains and specimens appear to be less responsive than others. Many roses have been hurt by too-rapid propagation without proper...
by Karl K
Tue May 21, 2019 12:06 pm
Forum: Rose Hybridizers Association Forum
Topic: Epigenetic Program
Replies: 1
Views: 188

Epigenetic Program

It has become increasingly apparent in recent decades that there is much to heredity that doesn't fit into the simplistic neo-mendelist model. Dominance, for example, is not a simple matter of presence vs. absence. Often, there is an element of chance involved in deciding which of two alternative ch...
by Karl K
Sat May 18, 2019 5:14 pm
Forum: Rose Hybridizers Association Forum
Topic: Age of fertility
Replies: 2
Views: 177

Re: Age of fertility

I see know reason why the very first blossoms wouldn't have viable pollen. There are cases. Some interspecific hybrids are sterile the first year or two (or longer) before becoming fertile. http://bulbnrose.x10.mx/Heredity/King/DelayedFertility.html And Fagerlind (1958) reported that some of his ro...
by Karl K
Wed May 15, 2019 3:37 pm
Forum: Rose Hybridizers Association Forum
Topic: Sterling Silver
Replies: 16
Views: 779

Re: Sterling Silver

Thanks for this, Karl. Hopefully someone at HMF will add the information on the second parent to the monograph for Sterling Silver. Don, I found two more newspaper articles, but they have the usual weakness: they are newspaper articles. I had a similar problem when I was researching Schoener. It be...
by Karl K
Tue May 14, 2019 9:59 pm
Forum: Rose Hybridizers Association Forum
Topic: Project for large rose hip X R. Pimpinellifolia. Questions..
Replies: 22
Views: 3106

Re: Project for large rose hip X R. Pimpinellifolia. Questions..

Hi Sebastian, Of all the hips I've handled, the only ones that make my mouth water are from Rosa roxburghii. The fragrance suggest something like peach or apricot. Coincidentally, I once pollinated a very double Roxburghii by 'Doorenbos Selection', a reblooming Spinosissima with purple-red flowers a...
by Karl K
Tue May 14, 2019 5:35 pm
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 25
Views: 1073

Re: R. davidii

Hi Karl, I just planted palustris scandens. Is this the same as plena??? Tom, I just looked up scandens on HMF. It does look like plena , but I won't express an opinion without seeing them together. The San Jose Heritage garden is not even vaguely swamp-like. It is hot in the summer. The plants are...
by Karl K
Tue May 14, 2019 11:45 am
Forum: Rose Hybridizers Association Forum
Topic: R. davidii
Replies: 25
Views: 1073

Re: R. davidii

found another old picture of the rose purchased as davidii from ForestFarm Slide4.JPG whatever it is, I've been enjoying working with it! :) Tom, I won't try to identify a species from a couple of pictures, but your "davidii" sure looks like the Rosa palustris plena I photographed at the San Jose H...
by Karl K
Mon May 13, 2019 6:41 pm
Forum: Rose Hybridizers Association Forum
Topic: Sterling Silver
Replies: 16
Views: 779

Re: Sterling Silver

roseseek wrote:
Mon May 13, 2019 3:25 pm
Thank you, Karl. Would you please add your article to the References section on HMF? I'll add the parentage quote.
I've been trying to add a few items, including two articles on 'Sterling Silver', but having little success. I just sent a note to the Admin.
by Karl K
Mon May 13, 2019 2:04 pm
Forum: Rose Hybridizers Association Forum
Topic: Sterling Silver
Replies: 16
Views: 779

Re: Sterling Silver

An article by Gladys Fisher I found this morning. Telegraph Delivery Spirit, 23(2): 36 (1956) Hybridizing Roses By Gladys Fisher  Arnold-Fisher Co. Woburn, Mass ROSES, old and new, are the most fascinating flowers in the world,  to write about as well as to work with in hybridizing for new varieties...