530 
INDEX TO VOLUME VIII 
MacDougal, D. T. Water deficit and the 
action of vitamines, amino-compounds, 
and salts on hydration, 296 
Madura pomifera, floral anatomy of, 394 
Macroglossum, sporophyte of, 308 
Magnolia, 194; pollen of, 483 
Mains, E. B. Unusual rusts on Nyssa and 
Urticastrum, 442 
Maize endosperm, genetic evidence of aber- 
rant chromosome behavior in, 411 
Malachra capitata, in Texas, 195 
Mallow, pollen tubes of, 474 
Malva parviflora, 195; sylvestris, 203 
Malvaceae, 331 ; food plants of, 329; in 
southern and western Texas, distribution 
of, 192 
Malvales, floral structure of, 405 
Malvastrum americanum, 194; coccineum, 
200; elatum, 200; spicatum, 195; wrightii, 
195 
Malvaviscus arboreus, 203; drummondii, 194 
Mangel wurzel, crown gall of, 508 
Maple pollen, 477; 483 
Marattiales, anatomy of, 309 
McDougall, W. B. Thick- walled root 
hairs of Gleditsia and related genera, 171 
McNair, James B. A study of Rhus diver- 
siloha with special reference to its toxicity, 
127; the morphology and anatomy of 
Rhus diversiloba, 179; the transmission of 
Rhus poison from plant to person, 238 
Mechanism of root pressure and its relation 
to sap flow, 369 
Melampsora, 443 
Melampsoridium Betulae, 444 
Melampsoropsis, 447, 448 
Melica ciliata, 44 
Mesquite, in Texas, 194, 198 
Mexican palm, in Texas, 194 
Mignonette, stylar canal of, 475 
Millet, the Linnaean concept of pearl, 41 
Mimosa, 198 
Modiola caroliniana, 194 
Monocarpy and pseudomonocarpy in the 
Cycadeoids, 218 
Moraceae, food plants of, 330; floral anat- 
omy of, 387 
Morus alba, floral anatomy of, 394; nigra, 
394 
Mountain cedar, 198 
Musaceae, 329, 331 
Narcissus, pollen of, 471 
Nematogonium aurantiacum, 122 
Nitrogen, the fixation of free, by green 
plants, I 
Nolina, 199 
Nyssa, 194; and Urticastrum, unusual rusts 
on, 442; aquatica, 442; capitata, 443 
Oak, 198; pollen tubes of, 474 
Oat plant, the relation of certain nutritive 
elements to the composition of, 256 
Oats, Ligowa, 455; miscellaneous studies on 
the crown rust of, 452 
Oenothera, 193; pollen tubes of, 474 
Oleaceae, 329 
Ophioglossum Moluccanum, 304; pedunculo- 
sum, 304; pendulum, 313; reticulatum, 
305, 313 
Opuntia, 194 
Orchidaceae, 387 
Osmotic concentration of the guard cells 
during the opening and closing of stomata, 
variations in the, 30 
Osmotic pressure, suggestions with respect 
to the measurement of, 164 
Otomycosis aspergillina, 125 
Ottonia section of Pipers, 212 
Overton, James Bertram. The mecha- 
nism of root pressure and its relation to 
sap flow, 369 
Palm, Mexican, 194 
Palmaceae, food plants of, 329 
Pandanales, 219 
Panicum, 193, 253; alopecur aides, 43; ameri- 
canum, 41, 43; cynosur aides, 44; dicho- 
tomum, 48; glaucum, 41; italicum, 253; 
lutescens, 41 ; miliaceum, 46, 253; spicatum, 
41, 47; viride, 43 
Papaveraceae, 330 
Papilionaceae, 405 
Papilionoideae, 175 
Parietales, 405 
Parkinsonia aculeata, 194; texana, 197 
Paton, Julia Bayles. Pollen and pollen 
enzymes, 471 
Pavonia lasiopetala, 199 
Peach curl, 318; yellows, 316 
Pear blight, 316 
Pecan, 198 
Pelargonium, pollen of, 472 
Penicillaria spicata, 41 
Pennisetum alopecuroides, 41; america- 
num, 41, 43; compressum, 43; glaucum, 41 ; 
