'R. xanthocarpa' rose Description
Photo courtesy of Margaret Furness
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White to butter-yellow, yellow stamens. Buds - light yellow [Warm creamy to lemony white]. Mild to strong, clove, honeysuckle fragrance. 5 petals. Average diameter 2.5". Large, single (4-8 petals), borne mostly solitary, flat bloom form. Moderate, once-blooming spring or summer. Large, long buds.
Tall, arching, climbing. Medium, glossy, light green foliage.
Height: 8' to 50' (245 to 1525cm). Width: 6' to 10' (185 to 305cm).
USDA zone 8b and warmer. Very vigorous. benefits from winter protection in colder climates. can be trained as a climber. flowers drop off cleanly. prefers warmer sites. shade tolerant. Disease susceptibility: very disease resistant, very blackspot resistant., very mildew resistant, very rust resistant. Can be grown as a climber in mild climates. Prune lightly or not at all.
Patent status unknown (to HelpMeFind).
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Rosa gigantea was already grown by G. Nabonnand in France in the 1870s. (see References)
R. gigantea plants in the US are from seeds supplied by Viru Viraragavan, Kodaikanal, Tamil Nadu India. Information from Viru...
"R. gigantea was collected in the Shan Hills of Burma at about 20 degrees N.latitude at an altitude of about 4000-5000 feet by General Collett.
"Rosa macrocarpa was collected in Manipur State , in North east India at a higher altitude of about 6000-7000 feet and about 5 degrees further north, by Sir George Watt.
"Though Sir George Watt considered R. macrocarpa to be a new species distinct from R.gigantea of Collett, the great Belgian taxonomist, Francois Crepin considered them to be identical, after examining specimens of both. In the absence of DNA we should probably follow Crepin's observation.
"From the common sense point of view, it appears to [Viru] that R.macrocarpa is yellower because it grows further north and at a higher altitude, i.e. less bleaching of flower color occurs in cooler temperatures.
"Crepin observes that in the Shan hills district where R. gigantea grows, frosts are almost unknown, whereas when Girija [Viraragavan] and [Viru] collected R. macrocarpa in Manipur on Mount Sirohi at an altitude nearing 7000 feet. There was a fair amount of frost on the ground, in places frozen into fairly substantial lumps which could not have been merely overnight dew frozen.
"From the seedlings raised from the Manipur seed collected by [Viru & Girija they] noticed considerable variation in flower color especially at the bud stage. Some of the seedlings are quite a dark yellow at bud stage whereas others are just cream. This color difference does not persist when the flower opens and all the kinds are creamy yellow by the second day.
"So to distinguish R.macrocarpa from R. gigantea by adopting flower color as the criterion seems to be incorrect. Pending further investigation we should perhaps consider R.macrocarpa of Manipur as only an eco -type of R. gigantea Collett. But I am hoping that the Manipur rose will prove somewhat cold hardier than the Burmese collection."
[R. x odorata (Andrews) Sweet (1818)
R. x odorata var. gigantea (Collett ex Crép.) Rehder & E.H. Wilson (1915) is a variety of above.
Rosa gigantea is recognized by its distinctive drooping, mahogany-colored new foliage, a characteristic it shares with Rosa chinensis var. spontanea.]
Information from Viru Viraraghavn