1) Frankincense 
• (n.) Any plant of the umbelliferous genus Laserpitium, of several species (as L. glabrum, and L. siler), the root of which yields a resinous substance of a bitter taste. The genus is mostly European.
La'ser·wort` (lā'sẽr*wûrt`) noun [ Latin laser the juice of the laserwort.] (Botany) Any plant of the umbelliferous genus Laserpitium , of several species (as Latin glabrum , and Latin siler ), the root of which yields a resinous substance of a bitter ...