268 



INDEX 



Page 

 Helenium 



autumnal* 53, 73 



Hoopsit 73 



tenuifolium 53, 73 



Distribution f . 79 



Helianthus 



annuus 59, 74, 78, 238, f 239 



Germination 42 



debilis 74 



grosseserratus 52, 74, 239, f. 240 



Maximiliani 239 



petiolaris 59, 74, 238 



tuberosus 52, 68 



Heliopsis scabra 11, 236-237 



Heliotrope 71, 80 



European 215 



Wild 59 



Heliotropium 



europaeum 71, 215 



indicum 80 



Hellebore 



False 64 



Green 57, 64 



Hemlock 63, 70 



Bulb-bearing 63 



Poison 64, 205 



Water 64, 206, f. 207 



Hemp 5, 10, 64, 81, 126, 161, 225 



Indian 64, 69, 208-209 



Water 31, 171 



Wild 13 



Henbane, Black 5, 63, 71 



Henbit 58, 59 



Herbicide 61, 94 



Ammonium sulphate 95 



Basic slag 95 



Blue vitriol 95 



Carbolic acid 95 



Copper sulphate 90, 94, 95 



Formaldehyde 95 



Iron sulphate 61, 90, 93, 95 



Lime, slaked 95 



Potassium sulphide 95 



Salt 95 



Sodium nitrate 95 



Sulphuric acid 95 



Hermaphrodite flowers 125 



Heuse 95 



Hibiscus Trionum 202, f. 202 



Hickory 117, 118, 125 



Hieracium aurantiacum 72, 254 



Hierochloe odorata 75, 145-146 



Highways, as seed carriers 25-26 



Hilgard, Dr. Eugene 80 



Hoary 



Plantain 40 



Puccoon 216-217 



Vervain 217, f. 218 



Hog Millet, Legislation 48 



Hogweed 173 



Hogwort 64, 193-194 



Holcus lanatus 36, 75 



Holy Grass 145-146 



Honeysuckle 117 



Family 228 



Hop Clover 69 



Low . . .189 



Page 

 Hordeum 



caespitosum 57, 157 



jubatum..S5, 57, 68, 155-157, f. 156 



Germination 42 



murinum 57, 68, 78 



nodosum 68 



Pratense 78 



pusillum 68, 155, f. 155 



secalinum 157 



Horehound 59, 219 



Water, Germination 42 



Horizontal ovule 130 



Horse 



Chestnut 64, 117,f. 119, 120 



Mint f. 22, 28, 30 



Nettle 7, 12, 13, 54, 58, 67, 



71, 83, 91, f. 221, 222 



Eradication 91,94, 109-110 



Germination 41 



Legislation 43 



Horse-radish 7, 8, 24, 26, 58, 64, 81, 184 



Horsetail 57, 64, 71 



Family 138-139 



Horseweed 11, 13, 24, 26, 58, 59, 



81,82, 115, 222 



Low 233, .233 



Howitt, J. E 108 



Humus, Loss of 6 



Hura crepitans 15 



Husbandry, Alternate 50 



Hyacinth, Water f. 79, 84 



Hybrid Goosefoot 70 



HYDROPHYLLACEAE 137,214-215 

 Hygroscopic movements of Seeds 15 



Hyoscyamine 5 



Hyoscyamus niger 71 



HYPERICACEAE 136, 202-203 



Hypericum perforatum 74, 203, f. 203 



Hypochaeris 61, 62 



radicata 251, f. 251 



Hypogaeous 134 



Hypogynous flowers 127 



Illinois, Weeds in 68-75 



Impatiens 15 



Indehiscent fruit 132 



Indeterminate inflorescence. . 124-125 

 India, Weed emigrants from .... 80, 81 

 Indian 



Currant 71, 228 



Hemp 64, 69, 126, 208-209, 225 



Mallow 36, 58, 78, 84, 87, f. 131, 



200, f. 200 



Eradication 112 



Tobacco 64 



Indiana, Weeds in 67, 68-75 



Indigo, Wild 64 



Indigofera tinctoria 71 



Inferior flower 127 



Inflorescence 124 



Determinate 124, 125 



Indeterminate 124, 125 



Innate filament 129 



Introrse anther 129 



Iowa, 



Legislation against weed pests 66-67 



Noxious weeds in 68-75 



Thistle . . 52 



