How many of the following statements are true regarding stamens? (1) Stamens united into one bundle are called monoadelphous. (2) Monoadelphous in china rose, diadelphous in pea and polyadelphous in Citrus. (3) Variation in the length of filaments within a flower as in Salvia and mustard. (4) Two bundles of stamens are diadelphous and when stamens are united into two or more bundles, they are polyadelphous.