This section is from the book "Garden Trees and Shrubs", by Walter P. Wright. Also available from Amazon: Garden Trees And Shrubs Illustrated In Colour.
See Chapter 18.
Nigrum and its forms scoticumrubrum and tomentosum are pretty little berried evergreens resembling Heaths, growing barely a foot high, and thriving in peaty soil in a moist place.
There are several species, but only one, campanulatus, is frequently met with. It is deciduous, grows up to six feet high and has red flowers resembling Andromedas in summer. It is not fully hardy, but may be grown outdoors in mild districts. Peat and loam.
The only species, repens, is the Mayflower, a pretty evergreen trailer belonging to the Ericaceae, with white fragrant flowers in summer. Peaty soil, with shade and moisture.
Volubilis (syn. spicata) is the same as Bridgesia spicata. It is an evergreen creeper with purple flowers and might be used for walls like ivy, as it clings well. Ordinary soil.
 
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