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mmanners 
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Carol in Santa Barbara questioned if hers was correct because the cluster was white through light and dark pink grown in the shade of her fruit trees. This definitely needs heat and bright light to develop the coloring.
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I think there is more to it than just heat and bright light -- right now we have two plants in our gardens. Brilliant sun today and 95°F (35C), and we still have a lot of pink and partially white flowers.
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According to Malcolm Manners, "Crenshaw Musk" and "Crenshaw Double Musk" originated from the same plant in Hollywood Cemetery in Richmond, VA. It is not unusual for the single form of R. moschata to occasionally sport to a double form.
The even more doubled version of R. Moschata, "Temple Musk" was also found in another area of the Hollywood Cemetery, and it is not known if it may be a sport of "Crenshaw Double Musk".
http://forums.gardenweb.com/discussions/4904767/crenshaw-musk?n=15
Virginia
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I just noticed this older post. While surely at some point in history, the semi-double form of the musk rose must have sported from an original single form, in practice, among garden plants of R. moschata, what one normally sees is the reverse -- starting with a double form plant, sooner or later it will nearly always sport a branch back to single. The reverse is apparently quite rare (I've never seen it, and I've been growing musks for nearly 30 years now). The very double "Temple" musk is known to have sported from the common semi-double one only twice, that I'm aware of, and I'm unaware of it ever sporting back to either the semi-double or the single form.
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Malcolm,
I read somewhere, long ago, that the single-flowered form of the Musk rose begins to produce doubled flowers only after it made sufficient upwards growth.
This may be analogous to the ivy, Hedera helix, that retains its vining habit indefinitely when it has no choice but to trail. However, when it finds support to grow upwards to a suitable height, it changes to the flowering or "tree" form.
I haven't grown the Musk rose, and the one I watched for several years at the Heritage Rose Garden was always being cut back to remain bushy.
Karl
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I'm not sure what's going on, but I tried searching for this rose on HMF using "William R. Smith" (minus the quotes) and got a message saying the rose didn't exist. Is there a glitch or am I just missing a typo I made?
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Yes,I think there is something odd.
William R Smith gets me straight there.
William R. Smith does not get me there.
The difference is one little full stop.
Admin?
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Yes this is still happening (May, 2019). (Patricia?) -- "William R. Smith" (with the full stop) is said not to exist. you have to make it William R Smith to get here.
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I can’t help any more with this one Malcolm. Only Admin can.
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Sorry, thought you were "Admin." Who is that? thanks.
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Admin is short for a very small team of Administrators who keep this community-funded website running smoothly. They are assisted by an equally small team of volunteers, of whom I am one, who assist in any way they can on the roses, but any assistance at all is appreciated - and needed. For all of us, it is a labour of love. I am sure Admin will be in touch on that Smith fellow.
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#7 of 7 posted
27 MAY by
jedmar
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'William R. Smith' works again. Sometimes it is a just a broken link, probably during a merge/deletion of a synonym which ttok place 11 years ago. Adding the name anew and deleting the old one usually works.
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Thornless forms of Fortuniana certainly exist - selectively propagated by some nurserymen who use this rose as a rootstock, but the majority of plants I have checked are quite prickly.
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#1 of 2 posted
16 MAR 18 by
bonbon
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Billy West
I will check my bush out for prickles. It is quite vigorous and at present is spot flowering in March 2018..
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In Florida, no matter how much you select for lack of prickles, the new plants will always make some. But the number of prickles varies widely through the season. In late spring, the plant tends to send up huge new canes, and these are often completely unarmed. Then as the weather turns hotter and the plant makes smaller, thinner branches, they will be dense with prickles. So we (and commercial Florida nurserymen) do select in favor of the smooth cuttings for understock cuttings, from among the prickly canes. I'm posting a photo of that wonderful late-spring growth. I'm about to take the season's cuttings!
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