862 WEED FLORA OF IOWA 



GLOSSAEY. 

 BY HARRIETTE S. KELLOGG. 



Aceumbent. Lying against, as when the edges of the cotyledon 

 lie against the cauliele or radicle. 



Achene. A dry, hard, 1-celled, 1-seeded, indehiseent fruit. 



Acuminate. Tapering somewhat gradually to a point. 



Acute. Ending in a sharp angle, not prolonged. 



Aerial roots. Those appearing on the stem above ground; may 

 be brace roots as in corn, or clinging roots as in ivy. 



Albumen. Nutritive material in seeds accompanying the 

 embryo. 



Aleurone grains. Protein grains replacing albumen in a few oily 

 seeds, and starch in others. 



Aleurone layer. Outer layer of the endosperm next to the peri- 

 sperm. 



Alternate (leaves). One at a node, not opposite; (flowers) parts 

 of one whorl opposite to intervals of next. 



Anatropous. Inverted and straight. 



Angiosperms. Higher seed plants. 



Angium. Case for pollen grains. 



Annual. A plant that performs its life cycle from germination 

 to matured seed in one season. 



Annual (Winter). A plant that germinates in the fall, grows 

 until frost; but blooms and matures seed the following spring. 



Anther. The part of the stamen which contains the pollen. 



Apetalous. "Without petals. 

 ■ Apex. Is opposite to point of attachment. 



Appressed. Lying flat against. 



Arachnoid. Cobwebby; covered with tangled hairs, fewer and 

 longer than when tomentose. 



Arrow-shaped. See Sagittate. 



Ascending. Rising obliquely or curving upward. 



Auricle. An ear-shaped appendage. 



Awn. An appendage composed of bristles. 



Axil. The upper angle formed between the leaf and stem. 



Axis. The central line of any organ or support of a group of 

 organs. 



Axillary. In the axil. 



Barbed. With ridged points or short awns usually reflexed. 



