GLOSSARY AND INDEX. 



acaulescent, without apparent stem. Applied to plants having so short 



an aerial stem that the leaves appear to arise directly from the 



root, 255. 

 achenium (pi. achenia), also written achcenium, a small, dry, one-celled, 



one-seeded, inferior, indehiscent fruit, 94. 

 acicular, needle-shaped, 58. 

 adnation, adhesion, or union, especially the congenital union of different 



whorls of a flower, 81. 

 adventitious, occurring out of the usual place ; as adventitious buds or 



roots, 36. 

 aecidium (pi. oecidia), the cup-shaped fruit of one of the developmental 



stages of the Uredinese, 109, 113. 

 aerial, growing in the air. 

 akene, or achene, see achenium. 

 ala (pi. alee), a wing; one of the two lateral petals of a papilionaceous 



flower, 197. 

 albuminous, containing endosperm or perisperm, 15. 

 aleurone, a, widely distributed, granular, proteinaceous food substance, 



generally accompanying starch but sometimes taking its place, as in 



oily seeds, 8. 

 alternation of generations, 98, 129, 146, 150. 

 alternate, of leaves, one at a node ; of the parts of a flower, standing 



before the intervals between the members of an adjacent whorl, 

 anastomose, to unite with each other so as to form a network. 

 anatropous, 16. 



androecium, the stamens of a flower collectively, 79. 

 anemophilous, wind-fertilized ; having the pollen borne to the stigma by 



the wind. 

 annual, producing flowers and fruits in the course of the flrst year from 



the time of sowing, and afterwards dying, 52. 



269 



