Spring Flora of Oklahoma 
213 
Hypanthium—Any enlargement or special development of the torus, 
in a flower, on which the sepals, petals, and stamens are borne; 
a perigynous or epigynous disk. 
Hypogynous—Having the calyx, corolla, and andrecium below the 
gynecium. 
Imbricated—Overlapping. 
Imperfect—Monosporangiate flowers; having only stamens or only 
carpels. 
Incised—Gut into sharp lobes. 
Included—Not projecting beyond surrounding parts. 
Incomplete—Wanting in one of the floral envelopes. 
Incubous—Having the scales or leaves so placed that the upper part 
of each one covers the base of the scale or leaf next above, it. 
Incumbent—Said of cotyledons when reflexed so that the back of 
one lies against the hypocotyl. 
Indehiscent—Not opening. 
Indeterminate—Not definite, nor limited. 
Indigenous—Native to the place. 
Inferior—Situated or arising below other organs. 
Inflated—Bladdery. 
Inflexed—Turned inward. 
Inflorescence—The flower cluster of a plant and its mode of ar¬ 
rangement. 
Inserted—Attached to or growing out of. 
Internode—Part of a stem between two successive nodes. 
Introrse—Pacing inwards. 
Involucel—A secondary involucre. 
Involucrate—Having an involucre. 
Involucre—A whorl of bracts subtending a flower or flower cluster. 
Involute—Rolled inwardly. 
Irregular—A flower with one or more organs of a set unlike the 
others. 
Keel—A projecting ridge. 
Key—A winged fruit, such as the maple or ash. 
Labiate—With a lip-like organ. 
Laciniate—Gut into narrow segments or lobes. 
Lanceolate—Lance-shaped. 
Lateral bud—An axillary bud. 
Lateral scale—A scale on the sides bf an axis. 
Latex—The milky sap of certain plants. 
L ea f—An expansion arising from the axis or branch of a sporophyte, 
usually specialized to carry on the functions of photosynthesis 
and transpiration. 
