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Rhododendron x hidaense R. hidakanum Til H R... f.hepesticum

Rhododendron x hidaense

 R. x hidaense, Foto: H. Eiberg
R. x hidaense pink, ARS 327/2010 (måske R. brachycarpum x R. degronianum ssp. pentamerum). Foto: H. Eiberg

 R. x hidaense, Foto: H. Eiberg
R. x hidaense pink, ARS 327/2010 (måske R. brachycarpum var. fauriei x R. degronianum ssp. pentamerum). Foto: H. Eiberg


R. x hidaense (Er af Tiara i The 1948 Royal Horticultural Society Rhododendron Year Book, s. 126), raporteret som en hybrid mellem R. degronianum og R. brachycarpum. Imidlertid udviser afkom af R. x hidaense helt ensartede frøplanter (R. hidaense pink Prefecture Kanagawa, ARS 2010, nr.327). Frøplanterne led vinteren 2012 af frost, så de er ikke hårdføre selvom moderplanterne er, men de skød igen. De større planter minder om R. hyperythrum fra Taiwan, idet bladstilken er rødbrun (det har ingen af de foreslåede forældre).
H. Eiberg

The record derives from WCSP (in review) (data supplied on 2012-03-23) which does not establish this name either as an accepted name or as a synonym with original publication details: Enum. Sperm. Jap. 1: 32 1941.

in Zissai-Engei xxvii. 1097 (1941), sine descr. lat.; Hara, Enum. Spermat. Jap., Pt. 1, 32 (1948), in adnot.
http://scholar.lib.vt.edu/ejournals/JARS/v20n3/v20n3-doleshy.htm
With R. degronianum and R. brachycarpum growing in such leaf-rubbing proximity, I looked for evidence of natural hybridization, but saw none. Also, the young plants since raised from the collected seed appear entirely distinct. Obviously, crossing would be prevented by a difference in flowering season, but I am not sure that this is the complete explanation and suspect that there may be some additional barrier to crossing. (Tiara, in the 1948 Royal Horticultural Society Rhododendron Year Book, p. 126, states that R. hidaense is considered a hybrid between these two plants. However, he does not specify that this is a natural hybrid, and I have not been able to find any other reference to such a hybrid in the literature.)