INDEX 



203 



cortex, 54, 55 



dicotyledon, 53 



growth, 56 



modification, 106 



monocotyledon, 53 



phloem, 54, 55 



pith, 54 



structure, 54 



xylem, 54, 55 

 Stigma, 114, 115, 116-119 

 Stipules, 72 



Stoma, 72-77, 73, 79-81, 88, 89, 98, 99, 

 182, 185 



number, 75 



size, 74 

 Stratification, 191 

 Strip-cropping, 163 

 Style, 114, 115, 116-119 

 Suckering, 61, 62 

 Sugar, 76, 79-81 

 Sulphur, 164, 169 

 Sunflower, 7, 118 

 Sweet-pea, 117 

 Symbiotic bacteria, 178 



T 



Temperature, 183, 184 

 Terracing, 163 

 Tobacco decoction, 101 

 Translocation, 69, 76 

 Transpiration, 43, 87-91 



amount, 88 



conditions influencing, 88, PI. XVI 



rate, 88 

 Transplanting, 95, 189 

 Tree surgery, 64, 65 

 Trisomic, 146 

 Tulip, 112, 115, 189 

 Turgor pressure, 44, 182, 184 



u 



Umbel, 113 



Vacuole, 23 



Van Helmont, 165 

 Variation, 149, 150 

 Venation, 72 

 Venus' fly trap, 77 

 Vernalization, 186 

 Vitamin B, 186 

 Vitamins, 151, 152 



W 

 Water, 75, 76, 79, 80, 87-91, 182, 184 



absorption, 15 



capillary, 47-50 



culture, 165, 172, 184, PI. XI, XII, XIV 



field capacity, 50 



gravitational, 48, 49 



holding capacity, 46, 47, 49, 51, 160, 161 



hygroscopic, 48, 49 



movement, 49 



plant growth, 184, 185 



requirement, 89, 90, PI. XI, XII, XIII 



run off^, 162, 163 



supplying power, 50 

 Weeds, 95, 104-111 



annuals, 104-107 



biennials, 104, 105, 107, 110 



classification, 104 



control, 18, 42, 107-111 



eradication, 108-111, PI. VI 



lawn, 108 



perennials, 104, 105, 107, 110 



propagation, 105-107 



seed, 104-108 



seed propagation, 107 



vegetative propagation, 106, 107 

 Wheat, 186, 187 

 Whorls in flowers, 114, 115 

 Wild carrot, 105, 113 

 Winter-killing, 192 



XYZ 



Xenia, 120 

 Xylem, 34, 54, 55 

 Zinc, 164, 165, 168, 169 

 Zinnia, 7, 113 

 Zygote, 131, 133 



