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Tropaeolum tuberosum Ruiz & Pav. - Tropaeolaceae
mashua, Knollige Kapuzinerkresse
Climbing perennial herb, up to 2(-4)m high; native to the central Andes (Bolivia, Colombia, Ecuador, Peru); flowers tubular, showy bi-coloured, sepals orange-red, petals bright yellow.
Mashua is grown its edible tuber (11g carbohydrates and 67mg ascorbic acid per 100g wet weigth) and as a companion crop to repel pests in potato fields.
http://en.wikipedia.org/wiki/Tropaeolum_tuberosum
Eating the tubers may have beneficial effects for kidney and bladder, as the isothiocyanates present should have antibiotic and diuretic effects. Male rats fed on mashua tubers have shown a 45% drop in testosterone levels.
[Johns, Timothy Allan. „Ethnobotany and phytochemistry of Tropaeolum tuberosum and Lepidium meyenii from Andean South America.“ (1980).]
https://circle.ubc.ca/bitstream/handle/2429/22154/UBC_1980_A6_7 J64.pdf
„Analysis of the isothiocyanates arising from enzymatic hydrolysis of glucosinolate extracts of Tropaeolum tuberosum supports the assessment of two subspecies. Seeds, tubers, leaves and flowers of T tuberosum subsp. tuberosum produced p-methoxybenzyl isothiocyanate. Subspecies silvestre produced benzyl-, 2-propyl- and 2-butylisothiocyanates. N, N-Di(4-methoxybenzyl)thiourea was detected in tuber extracts of subsp. tuberosum by HPLC.“
[Isothiocyanates and thioureas in enzyme hydrolysates of Tropaeolum tuberosum. Timothy Johns, G.H. Neil Towers, Phytochemistry, Vol.20(12), 1981, 2687–2689]