Rhododendron albiflorum
Rhododendron albiflorum
Foto: Hank Helm
Foto: Harold Greer
R. albiflorum at Garibaldi Lake Foto: Chris Klapwijk
Knop fra R. albiflorum ARS #4/2000 hos H.Eiberg. Foto: Hans Eiberg
Vinter knop fra R. albiflorum ARS #4/2000 hos H.Eiberg, jan. 2015. Foto: Hans Eiberg
Vinter knop fra R. albiflorum (ARS14 #85 cw. Manning Prov. Park, BC, Canada, Harold Fearing) hos Ole Jonny Larsen. Foto: Ole Jonny Larsen
Vinter knop fra R. albiflorum hos Mike Creel. Foto: Mike Creel
Knop fra R. albiflorum stamme ARS #4/2000 hos H.Eiberg. Foto: Hans Eiberg
R. albiflorum blomsterstilk. https://www.gbif.org/occurrence/2814113884. Foto: David Anderson
R. albiflorum stamme hos Mike Creel. Foto: Mike Creel
Mere om R. albiflorum
R. albiflorum (Albiflora) er eneste art i subsektionen. Er svær at dyrke i Danmark og USA og dør oftest inden et par år.
Bedst på veldrænet kold jord. Dør hvis spagnum er varm og tørrer lidt ud. Vildtvoksende i NV Amerika ved (2-300 m nær Muchalat, Nanaimo) 1200- 2300 m.
hvor rødderne ofte står i rent rindende vand. Måske skal den podes på R. luteum for at kunne klare sig over længere perioder.
H. Eiberg
ARS
Flora of North America
Flora of North America
D. Genbank
Kew's Herbarium
Burke Museum
Turner Photographics, Wildflowers
E-FLORA BC: ELECTRONIC ATLAS OF THE FLORA OF BRITISH COLUMBIA
Trees and Shubs Online
Drawing 1840
White bloming Rhododendron -You Tube
Cascade Chapter
Rhododendron × enneandrum DC. (1839): Formula hybridae: Rhododendron albiflorum Hook. × Rhododendron ponticum L.
Got this ref. from Mike Creel
Collecting in the West by ROBERT NICHOLSON
Nelson split the plant (as A. warrenii) from R. albiflorum on the
basis of the glandular, ciliolate leaves of the former, which otherwise
were glabrous. Five years later, in 1918, J. Francis Macbride transferred
the species to the genus Rhododendron. Because of the paucity
of pressed material, little comparative analysis with R. albiflorum was done and R. warrenii remained obscure.
In 1936 Louis O. Williams in Annals of the Missouri Botanical
Garden compared three collections from the Coloradan populations
with specimens ofR. albiflorum from the Northwest. He believed that
the two species were the same, and other botanists in the area concurred.
The plant is now considered R. albiflorum.
The few isolated populations of R. albiflorum east of the Cascades
probably originated by different means. Those in Alberta may be the
result of jump dispersal following the Wisconsin glaciation. But the
disjunct population in Colorado, which may have evaded glaciation,
could have resulted either from jump dispersal or range splitting.
Rhododendron seed is so small and light that it could easily have
lodged itself in fur or feather. Wind is also a dispersal agent for small
light seeds, and it is conceivable that seed from the Cascade populations
could have been carried east in a powerful storm. Volcanoes are
another possibility but a highly unlikely one. R. albiflorum is a component
of the Cascade flora and inhabits the sides of both active and
extinct volcanoes. The recent Mt. St. Helens eruption, which spread
ash as far east as Colorado, raises the question as to whether the seeds
could have been blown into the stratosphere and carried eastward.
Whether the seed could survive the intense heat and poisonous gases
of the blast is highly questionable, but it is an idea that gives botanists
a big bang theory to call their own. Of course, it is possible that other
populations will be found within the 500-mile disjunction, rendering it
less dramatic.
I think that to grow albiflorum successfully in non-native garden
settings there are several things one can do to increase chances of
colony formation and flowering. The replacement of soil with rotted
conifer wood is important and the addition of constant supplemental
water. I have found that my albiflorums will not root by my normal
means of woody cuttings in dome pots but will root in open containers of
sand/pine bark floating in my garden pond, but the rooted cuttings must
be moved prior to sunburn of leaves.
Mike Creel
R. albiflorum x, Mount Rainier varme tolerant hos Mike Creel. Bark ændret farve, knoppper specielle. Foto: Mike Creel
R. albiflorum x, Mount Rainier varme tolerant hos Mike Creel. Bark ændret farve, knoppper specielle. Foto: Mike Creel
R. albiflorum x, Mount Rainier varme tolerant hos Mike Creel. Foto: Mike Creel
R. albiflorum x, Mount Rainier, varme tolerant hos Mike Creel. Foto: Mike Creel
R. albiflorum x, Mount Rainier, varme tolerant hos Mike Creel, blomsterknop i Marts. Foto: Mike Creel