Episode 225: Sinningia
Sinningia leucotricha. Photograph: laurent houmeau on Flickr.
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Transcript
I’m joined by plant geneticist and molecular biologist David Zaitlin to talk about this fascinating genus, with a focus on florist gloxinia - Sinningia speciosa - and Sinningia leucotricha.
This week’s guest
David Zaitlin is a scientist at the University of Kentucky and has conducted several field trips to Brazil to study Sinningias growing in the wild. He has done plant breeding and genomics with this genus too.
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Argylia radiata
The plant Greg emailed into the show about was Argylia radiata - you can see some pictures of the plant on Dave’s Garden.
Check out the show notes below as you listen…
Sinningia is a new world tropical genus of around 75 species. Gesneriad researcher Alain Chautems did a lot of work on the taxonomics of this genus.
Most species are found in the Atlantic coastal forests of Brazil, often growing on granite hills. They range in size from some of the smallest plants you can imagine, up to 1m tall or more. They are often found growing alongside Begonias, spikemoss (Selaginella) and Bromeliads.
Sinningia speciosa aka florist gloxinia is probably the best known species, popularised for the cultivars bred from the species that became popular as pot plants in the 19th century.
Australian breeder Charles Lawn did a lot of breeding work on S. speciosa - his hybrids are still available today.
In the wild, S. speciosa is often found growing on rocky slopes, within pockets of humus or mossy areas, close to bodies of water.
S. speciosa grows from a tuber and goes through a seasonal growth cycle, producing flowers and foliage then dying back and going dormant. You can see images of wild form S. speciosa on Mauro Peixoto’s website Brazil Plants.
Sinningia leucotricha grows on rocks around waterfalls, often in accessible parts of Brazil. You might find this sometimes labelled as Rechsteineria leucotricha. Take a look at Mauro Peixoto’s website Brazil Plants for some images of this species.
Sinningia bullata has corrugated leaves and orange tubular flowers, originally collected from the Brazilian city of Florianopolis. It is a rambling plant that grows from a tuber, and as it grows it creates a chain of tubers joined by stolons.
Sinningias are often raised from seed: in terms of vegetative propagation, it’s hard to divide tubers, and you can also root leaf petioles of S. speciosa.
If you are interested in Sinningias, please join The Gesneriad Society - you can take part in their seed scheme to get hold of seed of some of the more hard-to-obtain species.
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CREDITS
This week's show featured the tracks Dill Pickles by the Heftone Banjo Orchestra, Roll Jordan Roll by the Joy Drops, The Road We Use To Travel When We Were Kids by Komiku and Namaste by Jason Shaw. The ad music was Dill Pickles by the Heftone Banjo Orchestra.