762 INDEX 
Gum resins, 97 
defined, 98 
Gums, 94, 95 
Gutta Percha, 101, 582 
Guttifera, 563 
Gymnosperm, life history of a, 444 
Gymnosperma, 443 
Gymnosperms, 15, 443 
classification of, 455 
differences from angiosperms, 438 
Gyneecium, 262, 283 
Figs. of forms of, 286 
Gynophore, 266 
Fig. of, 286 
Haberlandt, 123 
Habitat, defined, 3 
Hackberry, 507 
Hadrome, 142 . 
Hzmatoxylin stain, 683 
Hzmatoxylon, 539, 540 
Hematoxylon campechianum, 540 
Hagenia abyssinica, 536 
Hair cystoliths, 91 
Hairs, aggregate, 125 
barbed, 124 
branched, 125, 126 
candelabra-shaped, 124 
clavate, 124 
climbing, 126 
epidermal, 124 
functions of, 127 
glandular, 126 
hooked, 124, 126 
multicellular, 124 
multiseriate, 126 
non-glandular, 124, 126 
root, 127, 162, 154 
stellate, 124, 125 
stinging, 126 
tufted, 124 
unicellular, 125, 126 
uniseriate, 125, 126 
Halidrys siliquosa, 357 
Halophytes, 164, 617, 618 
Haloxylon, 514 . 
Hamamelidacea, 531. 
Hamamelidis Cortex, 532 
Hamamelidis Folium, 532 
Hamamelis virginiana, 532 
Fig. of, 533 
Hancermia, latex in, 101 
Hard Bast, 202 
Hardening, of soft materials, 695 
Harebell, 272, 277 
Haustoria, 161 
of fungi, 362 
Hawkweeds, 614 
Hawthorn, 258, 535 
Hay Fever, pollens responsible for, 283 
Hazelnuts, 504 
Head, defined, 259 
Heart-wood, 213 
Heath, 273 
Heath Family, 579 
Heather, 579 
Hedeoma, 595 
Hedeoma pulegioides, 595 
Hedera Helix, 575 
Heliamphora, 629 
nutans, 629 
Helianthemum, 567 
Helianthemum canadense, 567 
Heliconia, 253 
Heliotropea, 591, 592 
Heliotropism, 34 
Helleborus, 519 
Helleborus fetidus, 519 
Helleborus niger, 519 
Helonias, 490 
Helophytes, 617, 618 
Helvellales, 394 
Hemlock, 465 
Hemophilus, 373 
Hemp, 507, 508 
seed, 510 
Henbane, 597 
Hercules Club, 575 
Heredity, 643 
Hesperidin, 83 
Hesperidium, 305 | 
