Alveolate. Pitted, honeycombed, as are the seeds in certain Scrophulariaceae. 



Ament. A lax, spikelike inflorescence, as in the willows or alders (fig. 788). 



Amphibious. Capable of living on land or in water. 



Amphitropous. Turned both ways; applied to an ovule with hilum intermediate 

 between the micropyle and chalaza. 



Amplexicaul. Clasping the stem (fig. 481). 



Anastomosing (-ed). Netted; particularly applied to veins so connected by cross 

 veins as to form a network. 



Anatropous. An inverted and straight ovule, with the microplye next to the hilum, 



Androecium. A collective term applied to all structures in the stamen whorl or 

 whorls. 



Androgynous. Having staminate and pistillate flowers in the same inflorescence, 

 or in Carex in the same spikelet, the former above the latter. 



Angiosperms. Plants having their seeds enclosed in an ovary. 



Annual. A plant which completes its life history within a year. 



Annular. In the form of a ring. 



Annulus. A ring-shaped part or organ, such as surrounds the sporangium in some 

 ferns. 



Anterior. Pertaining to the side away from axis. 



Anther. The pollen-bearing part of a stamen. 



Antheridium. The male sexual organ of ferns; analogous to the anther, 



Antheriferous. Anther-bearing. 



Anthesis. The period during which a flower is open; the act of opening of a 

 flower. 



Anthodium. A head which resembles a flower, as in the sunflower (figs. 741, 788), 



Antrorse. Directed forward and upward. 



Apetalous. Without petals (fig. 25). 



Aphyllopodic. The lower leaves bladeless or nearly so. 



Aphyllous. Leafless. 



Apical. At the apex or tip. 



Apiculate. Ending abruptly in a minute point. 



Apomixis. Any form of asexual reproduction. 



Apophysis. An enlargement or swelling of the surface of an organ; the part of a 

 cone scale that is exposed when the cone is closed. 



Appendage. A lateral organ on a stem, usually at a node. 



Appressed. Closely pressed against. 



Aquatic. Living in water. 



Arachnoid. Covered with long hairs so entangled as to give a cobwebby appear- 

 ance (fig. 785). 



Arborescent. Treelike in tendency. 



Arcuate. Curved as a bow (fig. 41 ) . 



Areolate. Bearing areoles, divided into distinct spaces. 



Areole. A small angular pit on a surface, as may occur between the veins of a 

 leaf or on a seed coat. 



Argillaceous. Clayey, growing in clay or clay-colored. 



Aril. A process of the placenta adhering about the hilum of a seed, Arillate: with 

 an aril. Arilliform: bag-shaped. 



Aristate. Awned; provided with a bristle, usually at the end. (fig. 763). 



Aristulate. Bearing a short awn. 



Arroyo. A water course, or channel or gully, often dry, carved by water. 



Articulation. A joint; the area in a stem or in a leaf petiole where separation oc- 

 curs naturally. 



Ascending. Directed or rising upward obliquely. 



1706 



