Book  (Oct 2001)  Page(s) 105-106.  Includes photo(s).
 
Clematis 'Albiflora'
Atragene Group
(C. alpina 'Albiflora')
Magnus Johnson (Sweden) 1955
Introduced by Guernsey Clematis Nursery 1991
Seedling of C. alpina
... The single, creamy white flowers are made of four tepals, each 5 cm (2 in.) long. Staminoides are light yellow green... Flowering period: Midspring to late spring. Few flowers in late summer... Needs sharp drainage... Produces second flush of flowers in a sunny location...