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campylocarpum ssp. campylocarpum

Upright-growing and bushy evergreen shrubs or small trees with smooth elliptic leaves. The bell-shaped flowers are bright to pale yellow (mid- to late spring), and may have a reddish basal blotch. Very similar to the closely related R. wardii which has cup-shaped flowers. An easy and floriferous species with attractive flowers set against clean bright green foliage. Native to various montane habitats from 9,500 to 14,300 ft. in the eastern Himalaya.

1971/609  Eckford  (-5).  One of the best yellow flowered rhododendrons in a form of reduced height and leaf size asking only a well drained and semi-shaded site in which to perform.

1973/047  ("Hooker's form)  ROBB  (+5).  Flowers lemon yellow in this 1892 FCC clone.

1975/156  FR  (-5).  An elegant medium sized plant prized in cultivation for over a century for its clear light yellow blossoms and crisp green leaves, glaucous below.  An award form.  FCC.

1976/307  TRE  (0).

1982/173  JORG (0?).

1997sd411  CC#7541:RSBG  (0\R1\4).  These are grown from seed collected wild by Peter and Kenneth Cox in SE Tibet.

1997sd544  SEH#558:RSBG  (0\R1\4).  My own collection from 11,800 ft. in the Sikkim Himalaya.

1997sd555  SEH#569:RSBG  (0\R1\4).  My own collection from 10,600 ft. in the Sikkim Himalaya.

2000sd205  KR#6179:RSBG  (0\R1\4).  These are grown from a Keith Rushforth collection of seed (as ssp. caloxanthum) at around 13,000 ft. on the Showa La, SE Tibet.  The leaves are too long for caloxanthum and as this area is where the two subspecies as well as the closely related wardii all merge, I am not exactly sure of this name.  They could be wardii or they could be some weird form of ssp. caloxanthum.  Most likely ssp. campylocarpum from the looks of them however.  They are all fine garden plants.

campylocarpum ssp. caloxanthum

Small, rounded and compact-growing evergreen shrubs usually under four feet in cultivation. The orbicular leaves are typically blue-green in color. The bell-shaped flowers (mid-spring) are yellow to pale yellow. An attractive “dwarf” elepidote requiring excellent drainage and a bright but not too hot position (the foliage may scorch in the hot afternoon sun). Native to Upper Burma and adjacent areas of SE Tibet and NW Yunnan, China where it occurs in various subalpine and alpine habitats from 11,000 to 13,000 ft.

1965/283  Benmore  (-5).  Bright orange buds and soft yellow bell-shaped flowers transform this medium-sized shrub in April.  The delight continues as the round, blue-green new leaves unfurl a bit later

1965/522 (Telopeum Group)  KW#6868:Windsor (-5\R1\3). Blue-green leaves and yellow flowers on this rarely offered clone. 

1970/355  F#27123:Kew  (-5).  A classic representative of this Campylocarpum subseries plant with yellow bell-shaped flowers and rounded leaves.

1975/042  F#27125:Nymans  (-5).  One of Forrest’s collection from NW Yunnan with typical rounded leaf and flower and neat habit of the small thomsoniis.

1975/063  (caloxanthum)  Forrest#27123:WAK  (-5).

1979/106  Far.#937:Borde Hill  (-5).  A Farrer collection of this SE Asian native.

1983/104  Layritz:ADM  (-5).  Form with a larger leaf than typical.  Originally selected by Layritz.

1998/451 The new foliage emerges blue-green and the opening flower buds are usually orange in color. Sun or light shade.