Tuberous Comfrey
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Symphytum Tuberosum
"Symphytum tuberosum L.:
Native of Europe, from Scotland, where it is common in the east, south to France and Spain, and east to Russia and Turkey. Growing in woods, scrub and by rivers, flowering in May-June.
Plant creeping to form extensive patches, with a tuberous rhizome. Stems arching 15-40 cm, little branched. Flowers pale yellow, 15-20 mm long, the scales not exserted, as they are in S. bulbosum C. Schimper.
Easily grown in shade or a cool position in sun. Early flowering, and dormant in summer. Hardy to -20 degrees C or less."
-The Random House Book of Perennials, Volume 1: Early Perennials by Roger
Phillips and Martyn Rix, 1991, page 170
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Find out more
about Tuberous Comfrey in
Botany and History of Comfrey; Garden Uses of
Comfrey
Tuberosum (Tuberous Comfrey)
Current Botanical Nomenclature
S. tuberosum Subspecies and Varieties
S. angustifolium
S. besseri
S. bulbosum
S. floribundum
S. gussonei
S. leonhardtianum
S. mediterraneum
S. nodosum
S. popovii
S. zeyheri and others
S. tuberosum Distribution (Locations)
Description
S. tuberosum Breeds with Other Symphytum Species
Chromosomes
Alkaloids
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Symphytum
Tuberosum Complex: Subspecies and Varieties
"The
Symphytum tuberosum complex belongs to one of the most complicated groups
within the genus Symphytum Linnaeus (1753: 136) in Europe, mainly due to
an occurrence of polyploidy and associated extensive morphological variability
(Gadella & Kliphuis 1978, Murín & Majovsky 1982, Kobrlova et al. 2016).
Despite current progress, the taxonomy of S. tuberosum is still not satisfactorily resolved. The members of this complex are distributed across Europe and Asia Minor (Bucknall 1913, Murin & Majovsky 1982, Kobrlova et al. 2016) and a total of ten taxa have been described within this complex, three of them from Central Europe:
Symphytum tuberosum Linnaeus (*1753: 136)
Symphytum angustifolium A.Kerner (**1863: 227)
Symphytum leonhardtianum Pugsley (***1931: 95)."
-‘Taxonomic Status and Typification of a Neglected Name Symphytum Leonhardtianum from the Symphytum Tuberosum Complex (Boraginaceae)” by Lucie Kobrlova, Terezie Mandakova and Michal Hrones (all from Czech Republic); Phytotaxa, Volume 349, No. 3, pages 225-236, 2018.
(* -‘Species Plantarum’ by Linnaeus, Volume 1, Symphytum tuberosum page 136.)
(** -‘Descriptiones Plantarum Novarum Florae Hungaricae et Transsilvanicae’ by A. Kerner, Oesterreichische Botanische Zeitschrift {Austrian Botanical Journal}, Vienna, Austria, Volume 13, No. 7, page 227, 1863.)
(*** -‘The Forms of Symphytum Tuberosum L.’ by H.W. Pugsley, B.A., F.L.S., Journal of Botany: British and Foreign, London, England, Volume 69, page 95, April 1931.)
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