542 



INDEX 



Ascus, 248, 249*, 251* 



Asexual generation, 278, 304, 342, 



345-350 



Ash tree, naturally grafted, 69* 

 Asparagus, 55* 

 Aspergillus, 250* 

 Aspidium, 308*, 314* 

 Assimilation, 107, 112, 115, 163 

 Associations, plant, 474, 475 

 Autumn leaves, coloration of, 121, 



122 



Auxospore, 196* 

 Axillary bud, 81*, 82* 

 Axillary inflorescence, 132* 



Bacteria, 228-237*, 238 



Bailey, L. H., 448 



Barberry, spiny leaves of, 416* 



Bark. 59, 60*, 65-67*, 71, 72, 366*, 



368 



Bark cells, 25* 

 Basidia fungi, 258-271* 

 Basidiomycetes, 258-271* 

 Basidium, 258-267* 

 Bast, 312*, 367 

 Bast bundle, 25*, 62* 

 Bast, soft (sieve tubes), 61-63* 

 Batrachospermum, 217 

 Beans, selection among, 504 

 Bees, 422*, 423, 426* 

 Beggar's ticks, 444* 

 Bell-shaped, App. II 

 Belt's bodies, 414*, 415 

 Berry, 148*, 150* 

 Bieunial, 26, 46 

 Bilaterally symmetrical flowers, 



124*, 125* 



Bilaterally symmetrical leaves, 88 

 Birch, branching of, 46* 

 Bird pollination, 428 

 Bisexual, 123* 

 Bitter roots, 25 

 Bitter seeds, 11 

 Black knot, 252* 

 Bladderwort, 437* 

 Blights, 244-247* 

 Blister blight, 245* 

 Blue-green algae, 174-178* 

 Blue-green alga3, life habits of, 177, 



178 



Blue-green algae, summary of, 178 

 Bog zonation, 476-478* 

 Boletus, 265*, 267 

 Botany, definition of, 1 

 Botany, economic, 500-535* 



Botany, economic, definition of, 3 



Botany, systematic, definition of, 2 



Botrychium, 324* 



Botrydium, 200* 



Box elder, buds of, 82* 



Box elder, radial and cross sections 



of stem of, 61* 

 Brace roots, 21* 

 Bract, 133*, 138* 

 Branched leaves, 91-93* 

 Branches formed from adventitious 



buds, 87 



Branching, alternate, 41*, 94* 

 Branching and leaf arrangement, 



41-45* 



Branching, opposite, 41* 

 Branch thorn, 44* 

 Breeding, plant, 500-513* ^ 

 Brown algae, 205-213* 

 Brown algae, life habits of, 205, 206 

 Brown algae, summary of, 213 

 Bryales, 293-301* 

 Bryophyta, 275-305* 

 Bryophytes, 275-305* 

 Bryophytes, evolution of, 302 

 Bryophytes, origin of, 302 

 Bryophytes, summary of, 303, 304 

 Buckeye, bud of, 80* 

 Budding, 238* 

 Buds, 80-87* 



Buds, adventitious, 83. 87* 

 Buds, dormant, 87 

 Buds, naked, 80, 81* 

 Buds, position of, 82*, 83, 87* 

 Buds, structure of, 80-86* 

 Bud-scale scar, 40* 

 Bud scales, 80*, 83 

 Bulb, 53* 



Bulb, hyacinth, 53* 

 Bulblets, 438 



Bulrush, cross section of stem of, 58* 

 Burbank, Luther, 510 

 Burs, 442-444* 



Buttercup, leaf of, 91*, 104-106* 

 Butternut, buds of, 82* 

 Buttons, 266* 



Cactus, 54*, 463* 



Caladium, 52* 



Calamites, 339, 340, Plate VIII 



Calcium, 28, 29 



Calyptra, 277, 295, 296*, 301* 



Calyx, 123*, 124*, 126* 



Cambium, 25*, 60-67*, 306*, 367 



Cambium ring, 65, 67*, 71, 72, 367 



