Abies (Firs) 



balsamea (balsam F.), 150; lasiocarpa 

 (subalpine F.), 84 



Abscission layer, 87 



Abundance. See Population density, 

 Frequency 



Acer (Maples) 



pennsylvanicum (striped M.), 83; m- 

 brum (red M.), 142; saccharum 

 (sugar M.), 83 



Adaptation, 26, 27, 31, 42 

 and ecological success, 54-58 

 and periodicity, 86-87, 90 



Adenocarpus spp., 44 



Adenostoma fasciculatum (Chamiso), 64 



Aesculus octandra (Sweet buckeye), 83 



Aestival aspect, 87 



Affinity, between stands, 1 74 



Africa, East, 49; South, 68; Nigeria, 

 82 



Aggregation, contagious, 132 



Aggregation of organisms, 65, 97, 116, 

 154, 171 



Agroclimatic analog, 14 



Agropyron (Wheatgr asses), 184 



albicans, 145; cnstalum (crested W., 

 Fairway strain), 22, 38, 68, 92, 

 101, 107; desertorum (standard 

 crested W.), 21; intermedium (inter- 

 mediate W.), 22, 38; molle, 145; 

 spicatum (bluebunch W.), 31, 98, 

 99, 101, 104, 131; smithii {vje^tem 

 W.), 11, 22, 23, 30, 44, 48, 62, 70, 

 71, 72, 73, 92, 95, 98, 101, 107, 

 110, 114, 128, 131, 144, 145, 172 



Agrostis (Bentgrasses, Redtops) 



setacea (redtop), 72; tenuis (colonial 

 B.), 35, 96 



Akpotak Island, 158 



Alabama, 24 



Alaska, 30, 36, 56, 61, 63, 103, 117, 



138, 139, 146, 150, 154, 156, 158, 



162, 182 

 Alder. See Alnus 

 Alectoria ochroleuca, 18, 62, 161 

 Alfalfa {Medicago sativa), 34, 35, 51; 



African, 32; Ranger, 32 

 Alfilaria. See Erodium 

 Allegheny Mountains, 83 

 Alliance, 126, 161, 178, 179, 180 

 Allogenic succession, 149 

 Allopatric, 44 

 Alnus (Alder), 37, 53 

 Alopecurus alpinus (Alpine foxtail), 16 

 Alpine region, 17, 30, 36, 57-58, 62, 



82,94, 157, 158, 174, 181, 187 

 Alternation, microcommunity, 165 

 Alternation of communities, 112, 146; 



165 

 Amaranthus palmeri (Pigweed), 32 

 Ammophila (Beachgrass), 56; arenana, 



149 

 Analysis, fioristic, 188 

 Analysis, sociological, 131, 137, 178, 



180, 188 

 Anderson, E., 43 

 Andropogon (Bluestems), 85 



gerardi (big B., turkey-foot), 22, 71, 



72, 114, 128, 129, 130; scopanus 



(little B.), 14, 15, 28, 55, 71, 73, 



82, 91, 97, 101, 185; virginicus 



(broomsedge), 28, 155 

 Andropogon community, 125 

 Antennaria neglecta (Pussytoes), 85 

 Apomixis, 41 

 Appalachian Mountains, 95, 101, 140 



203 



