Polygonatum multiflorum (L.) All. - syn.Convallaria multiflora L. - Asparagaceae (Liliaceae)
Solomon's seal, Lily of the Mountain, Vielblütige Weißwurz, Vielblütiges Salomonssiegel

Perennial herb, up to 90cm high, native to Europe and adjacent Asia, cultivated; leaves alternate, up to 10cm long, oblong-ovate, sessile; flowers tubular, pendent, 1.5-2cm long, white green-tipped, fragrant.

„It is valued in cultivation for its ability to colonise shady areas, and is suitable for a woodland style planting… The specific epithet multiflorum means 'many-flowered'“
http://en.wikipedia.org/wiki/Polygonatum_multiflorum

Azetidine-2-carboxylic acid (ACA) is a potent toxin that could be incorporated into proteins in place of proline leading to protein dysfunction. „40 g of ACA was isolated from 40 lb. of fresh rhizomes of P. multiflorum (approximate content was 2.20 mg/g of fresh rhizome). Considering the loss during isolation and residual water in fresh rhizomes, actual ACA content in dried rhizomes of P. multiflorum may be close to our calculation.“
[Gas chromatographic determination of azetidine-2-carboxylic acid in rhizomes of Polygonatum sibiricum and Polygonatum odoratum., Baek, S.H., Lee, J.G., Park, S.Y., Piao, X.L., Kim, H.Y., Bae, O.N., Park, J. H., Journal of Food Composition and Analysis, Vol.25(2), 2012, 137-141]
[Nitrogenous compounds and nitrogen metabolism in the Liliaceae. 4. Isolation of azetidine-2-carboxylic acid and evidence for the occurence of alpha gamma-diaminobutyric acid in Polygonatum., L. Fowden, M. Bryant, The Biochemical Journal, Vol.70, 1958, 626–629]

Thomé,O.W., Flora von Deutschland Österreich und der Schweiz, Tafeln, vol.1, t.110bis (1885)
http://plantgenera.org/species.php?id_species=821775