[From The Rose Garden, Tenth Edition, by William Paul, p. 79:] Hybrid Chinas thrive in less favourable situations than most others... [and are also known for their] hardiness, finely-shaped flowers and great variation in colour...
[Ibid, p. 249-51:] The Hybrid Chinese Roses have originated from the French and the Provence crossed with the Chinese, or vice versa; they are therefore Hybrids. Although called Hybrid Chinese, they partake more intimately of the nature of the French and Provence Roses than of that of their Chinese parent [which is why Paul lists them under Rosa Gallica]. One feature in particular requires notice; they bloom only in June and July; whereas the Chinese are the most protracted bloomers, flowering constantly from June till November.

The group "Hybrid Chinese" of some Catalogues includes more than the name seems to imply; it embraces those varieties also whose parentage on the one side is the Noisette and Bourbon. In [Paul's] arrangement they stand divided into three groups, namely, Hybrid Chinese, Hybrid Noisette, and Hybrid Bourbon...

The Hybrid Chinese differ from the French Roses in their growth, which is more diffuse; in their foliage, which is usually smooth, shining more or less, and retained on the tree later in the year; in their thorns, which are larger and usually more numerous; and in their flowers, which are produced in larger clusters, with petals less flaccid, and which remain in a perfect state a longer time after expansion. These Hybrids are more vigorous in growth than either of their parents, and are in their nature very hardy.

[From Origin of Rose Types, by Roy Shepherd, p. 34:] The classification "Noisette and bourbon" is seemingly unnecessary as both are basically hybrid chinas...