1999
Hong, D.-Y. & Pan, K.-Y.
Paeonia x papaveracea Andrews (pro sp.)
Bot. Rep. 7:t. 463. 1807. - Type: the plate cited (!).
P. yananensis T. Hong et M. R. Li in Bull. Bot. Res. 12(3): 226. Fig. 3(p. 233). 1992, syn. nov. - Type: China, Shaanxi, Yan'an, Wanhua Shan, in Plalycladus forests, 1991, 05,13, Hong, T. 915013 (CAF).
The specimen Hong, D. Y. and Feng, Y. X. H97068 (see below) extremely resembles Andrews' P. papaveracea in having lobed leaflets, single flowers, white petals with a purple-red blotch at the base, purple-red filaments, red-purple floral disc and red Stigmata (Plate 8). Hong, Pan and Zheng 94009 was collected exactiy at the type locality of P. yananensis, and Hong, Pan and Zheng 94011 was collected at the place ca. 400-500m E of the type locality. These threee Specimens are very similar to each other, and the latter two differ from Hong, D. Y. and Feng, Y. X. H97068 only in having petals pink instead of white. The number of their leaflets is mostly 11-15, in between P. rockii and P. jishanensis. All their characteristics can be found in these two species. Furthermore, P. jishanensis exists on Wanhua Shan, near the peony garden and P. rockii can also be found in the garden. Therefore, we have sufficient evidence to propose that P. papaveracea Andrews is a hybrid between P. rockii and P. jishanensis, and the hybrid escaped from the garden and have become naturalized.
Specimens examined. Shaanxi, Yan'an, Mt. Wanhua Shan, in Platycladus forest, 1994,05,05, Hong, Pan and Zheng 94009(PE); eodem loc. in the valleyofeast side, in Platycladus forest, Hong, Pan and Zheng 94011 (PE); Yan'an, Wanhua Township, Wangjiagou Village, in waste field, Hong, Pan and Zheng 94008 (PE); Yan'an, Mt. Wanhua Shan, in the valley of east side, in cultivation, 1997,05,09, Hong, D. Y. and Feng, Y. X. H97068 (PE).
1999
HONG De-Yuan & PAN Kai-Yu Taxonomical history and revision of Paeonia sect. Moutan (Paeoniaceae) Acta Phytotaxonomica Sinica 37(4):351-368(1999)
