Die weisse Blumen- und Samenfarbe von Ph. nanus erschien allerdings gleich in der ersten Generation an einem ziemlich fruchtbaren Exemplare, allein die übrigen 30 Pflanzen entwickelten Blüthenfarben, die verschiedene Abstufungen von Purpurroth bis Blassviolett darstell[t]en.
The white flower and seed colour of Ph. nanus did indeed appear right away in the first generation on a quite fertile specimen, but the remaining 30 plants developed flower colours which represented various shades from purple to pale violet.
first generation = ersten Generation Refers to what we would call F2 today (see p. 12, s. 3). Bateson makes this clear in his translation by adding “from the hybrids” in square brackets (emphasis in the original).
represented = darstell[t]en The printed text has darstellen, which Mendel corrected to form the past tense in the offprint.