<jats:p> In addition to 3-methoxy-pyridine, which had previously been isolated from Thermopsis rhombifolia (Nutt) Richards, the following known alkaloids have now been obtained—thermopsine, N-methyl-cytisine, and cytisine. Two other alkaloids that are regarded as new have also been obtained. They are now named rhombifoline (C<jats:sub>15</jats:sub>H<jats:sub>20</jats:sub>O<jats:sub>2</jats:sub>N<jats:sub>2</jats:sub>) and rhombinine (C<jats:sub>16</jats:sub>H<jats:sub>22</jats:sub>O<jats:sub>2</jats:sub>N<jats:sub>2</jats:sub>) and have been characterized as their perchlorates and picrates. The free bases have not been obtained crystalline and the given empirical formulae are regarded as tentative. Incidentally two neutral non-nitrogenous compounds were isolated. They are referred to as Compound A (C<jats:sub>19</jats:sub>H<jats:sub>20</jats:sub>O<jats:sub>10</jats:sub>) and Compound B (C<jats:sub>22</jats:sub>H<jats:sub>16</jats:sub>O<jats:sub>6</jats:sub>).