i recently discovered this picture which clearly shows mme jules gravereaux's squat and flat bottomed buds, as do the cultivars of it at l'hay-les-roses.
in the sangerhausen collection, mme jules gravereaux has all the characteristics of another variety with oblong, strongly ciliated sepals twisting above the bud who's bottom is of a more slender shape: this variety matches comtesse de noghera in commerce and equally in the sangerhausen collection.
where did the plant in the photograph came from?