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Cayaponia tayuya

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 I found this plant in a UK BG with the tag:
Siolmatra brasiliensis.

It is not, but it is also known as 'taiuiá'.

A caudex from the wild,

Author: Célestin Alfred Cogniaux, 1881
Origin:   Bolivia, Brazil, Ecuador, Paraguay, Peru
Soil:  Rich - Mix
Water:  Maximum
Sun:  Medium - Maximum
Thickness:  10 Centimetres
Height:  6-8 Metres
Flower:   Greenish Yellow
Propagate: Seeds/Cuttings
Names:  Tayuya
Synonyms:  Bryonia tayuya, Vell. 1825.
Trianosperma tayuya
, Mart. 1843.
Trianosperma piauhiensis
, Cogn. 1878.
Cayaponia piauhiensis
, Cogn. 1881.
Allagosperma tayuya, M.Roem.
Alternasemina tayuia, Silva Manso
Arkezostis piauhiensis, Kuntze
Arkezostis tayuya, Kuntze
Bryonia cordatifolia, Goday Torres
Bryonia cordifolia, Walp.
Bryonia tajuja, Mart.
Trianosperma tayuya var. pallidum, Cogn.

This member of the Cucurbitaceae family was given this name by Célestin Alfred Cogniaux in 1881. It is found in Bolivia, Brazil, Ecuador, Paraguay and Peru, growing in a rich and drained soil with lots of water and some to lots of sun. The caudex can grow to ten centimetres in diameter and 70 centimetres long, the vines from six to eight metres in length. The flowers are greenish yellow.

Brazilian botanist António Luiz Patricio da Silva Manso named this genus after the indigenous Cayapo people of Brazil. The species name originates from the locals name: 'taiuiá'.

A caudex from a botanical garden.

 The flower by Mauricio Mercadante,