The Illustrated Dictionary of Gardening

Every genus a Victorian gardener could grow — Abelia to Zygopetalum across four volumes, with each plant's history, species, and culture, by the Curator of Kew.

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Ronnbergia (Two species are now referred)

Two species are now referred to this genus. To that described on p. 313, Vol. III., the following should now be added: R. columbiana (Columbian). fl. dark blue, with a white tube, hypocrateriform; spike short; bracts brownish, membranous. l. rosulate, very coriaceous, arched, wavy, smooth, dark green above, violet-brown beneath, bordered with small teeth. Stem 1ft. high. Columbia. The correct name of this plant is Billbergia columbiana.

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