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Ornithogalum umbellatum L. - Liliaceae - Star of Betlehem, nap-at-noon, Doldiger Milchstern, Stern von Bethlehem
Perennial herb, native to southern and central Europe, cultivated as ornamental, naturalized in North America; bulbs renewed each year, bulblets numerous; leaves linear-lanceolate with white adaxial stripe; flowers opening in sun, closing at night, white with green abaxial stripe.
„Flowering spring… Planted as a garden ornamental, Ornithogalum umbellatum produces many offsetting bulblets that are transported in soil and can become rampant weeds… Two digitalis-like glycosides, convallatoxin and convalloside, poisonous to humans and livestock, are found throughout the plant, but are concentrated in the bulbs and the flowers (W. H. Blackwell 1990; K. F. Lampe and M. A. McCann 1985; D. G. Spoerke Jr. and S. C. Smolinske 1990).“
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101813
Dietrich, A.G., Flora regni borussici, vol. 1: t. 56 (1832-1833) [A.G. Dietrich]
http://plantgenera.org/species.php?id_species=726084