Fig. 285. Flower of Lobelia cardinalis, Cardinal flower; corolla making approach to the ligulate form; filaments (st) monadelphous, and anthers (a) syngenesious.
Fig. 286. Flower of a Mallow, with calyx and corolla cut away; showing monadelphous stamens.
Fig. 287. Monadelphous stamens of Lupine. 288. Diadelphous stamens (9 and 1) of a Pea-blossom.
Diadelphous (meaning in two brotherhoods), when united by the filaments into two sets, as in the Pea and most of its near relatives (Fig. [288]), usually nine in one set, and one in the other.
Triadelphous (three brotherhoods), when the filaments are united in three sets or clusters, as in most species of Hypericum.
Pentadelphous (five brotherhoods), when in five sets, as in some species of Hypericum and in American Linden (Fig. [277], [289]).