866 WEED FLORA OF IOWA 



Herbaceous. Having the characters of an herb. 



Hermaphrodite. Perfect, having both stamens and pistils in the 

 same flower. 



Hilum. The scar of the seed ; its place of attachment. 



Hirsute. Clothed with rather coarse or stiff hairs. 



Hispid. Beset with erect stiff hairs or with bristles. 



Hypoderm. Beneath the epiderm. 



Hypogynous. With parts under pistil. 



Imbricated. Overlapping either vertically or spirally like 

 shingles of a roof. In aestivation, one piece is wholly external and 

 one wholly internal. 



Imperfect. Applied to a flower lacking either stamens or pistils. 



Included. Opposed to exserted ; not protruding from the en- 

 velope. 



Incumbent. Applied to cotyledons when the radicle is folded 

 back against one of them. 



Indehiscent. Not opening by valves or slits. 



Indeterminate Inflorescence. Flowers arise laterally and suc- 

 cessively as floral axis elongates. 



Indurated. Hardened. 



Inflexed. Bent abruptly inward or downward. 



Inflorescence. The flowering part of a plant. 



Inserted. Attached to or growing out of. 



Integuments. Coats of ovule. 



Internode. Any part of a stem situated between two nodes. 



Interrupted. Applied to surface or series the continuity of 

 which is broken. 



Involucre. A circle or collection of bracts immediately subtend- 

 ing a flower or inflorescence. 



Isodiametric. Equal in three dimensions. 



Joint. A node. 



Keel. A ridge somewhat resembling the keel of a boat; applied 

 especially to the two anterior united petals of a papilionaceous 

 flower. 



Lamella. A thin plate. 



Lamina. Blade or expanded part of leaf. 



Lanceolate. Lance-shaped; tapering abruptly toward the base 

 and gradually toward the apex. 



Lenticular. Lentil-shaped ; in the shape of a double convex lens. 



Ligneous, lignose, lignified. Woody in texture. 



Ligulate. Refers to the strap-shaped corolla of composite flow- 

 ers, as Dandelions. 



