Included. Not at all protruded from the surrounding envelope.
Incubous (leaf). Having the tip or upper margin overlapping the lower margin of the leaf above.
Incumbent (cotyledons). Lying with the back of one against the radicle.
Indefinite (stamens). Inconstant in number or very numerous.
Indehiscent. Not opening by valves, etc.; remaining persistently closed.
Indigenous. Native and original to the country.
Indurated. Hardened.
Indusium. The proper (often shield-shaped) covering of the sorus or fruit-dot in Ferns.
Inequilateral. Unequal-sided.
Inferior. Lower or below; outer or anterior. Inferior ovary, one that is adnate to the calyx.