INDEX 
Mollisia umbonata. 19 
Mollugo verily 35 
Fe pe retia, 
oclea Gotischei, 6 
e meahanie 
ublenbebela dumosa 242; micro- 
ma, 242; Port sh = 
Muounz, Pur A., NSTON, IVAN 
M., Miscellaneous ae on plant s of 
South rn California—I, 31; —II, 
oe 
Mycoidea parasi 
Mycological eh yah 1920, 163 
Oporum serratum, 15. 
Myosurus cupulatus, 36 
Naias, 54; flexilis, 35 
Nama hu humifusum, 356 
261; coto, 260 
ie “faery 1645 ‘resinae, 164 
olloydia, 2 
po 252 
New prerican fossil hepatic, A, 207 
merican sic of 
New British a 
b rpho- 
a >= 
A, 211 
ommelinaceae, 
269 
Nee jee from western Colorado, 
153 
New haa and other notes on North 
akota plants, 93 
New species of trees of medical interest 
from Bolivia, 25 
species of Uredineae—XIV, 
muicrocarpa, 
242 
North + eng oe - records 
oe er notes o 
Nost aap aes 299 
Notes te 1920, Mycological, 163 
Notes on Carex—XII, 361 
Notes on — Dakota plants, New 
records and other, 9 
Notes on plants of Southera California, 
239, 241; rryi, 32; sinua 
sinuata integerrima, 31, 241; tenera, 
Nuttallia, 183; marginata, 183 
2 
ea, 
Nyssa sylvatica, 166 
1; Beguinii, 252; conoi- 
189 
59; glauca, 248; 
405 
Occurrence of the pycnial stage of 
Puccinia Taraxaci, 
Oenothera, 354; cardiophylla, 3553 
mahi i soleudene, 354; speci- 
4 
Ginna CARRIE, Stimulation of 
plants by = disulphide, 375 
Olneya tesota 
O phioglossum’ Aes 211 
Gober monophyllos, 349 
Opuntia arborescens, 247; Bigelovii, 
238, 247: chlorotica, 247; fulgida, 
246; si peirsameges 247; Toumeyi, 247 
Osmunda, 52; ustris aurea, 52; 
, Two new plants 
from western Colorado, 183 
OVERHOLTs, ., Mycological notes 
for 1920, 16 
Panaeolus, 232; ‘campanulatus, 232° 
papilionaceus, 232 
Pandorina, 12 
Panicum perlongum, 103 
Pannaria rubiginosa, 7 
Panus, 2 = 
Papulos 
Poriathcia Ohta 243 
Parkinsonia ccitonoiie: 245 
-6 
a, 349 
Parosela Greggii, 245; Polen 245 
Parthenium incanum, 
Patellaria applanata, 16 Ai hirneola, 
16; olivacea, 16, 20; , 19; pulla 
nigro-olivac 16, e: violacea, 16 
Patinella applanata, 16, 19; hirneo 
16, 19; olivacea, 16, 19; Violacea, 16, 
I 
Pectocarya scent 247 
Pediastrum, 131, I 
| Pellaea compacta, rey mucronata, 239, 
241 
Penicillium apr my 334, 375 
Penstemon, 43, 189; albomarginatus, 
44; antirrhinoides, 43; antirrhinoides , 
m us, 43; barbatus, 40; 
barbatus Torreyi, 404 calcareus : 
eA gi 41, 357; Clevelandi con- 
3573 rig ma Bem? Stephensi 
x; 357; ‘desertorum, 42; Eatoni, 40; 
ruticosus, 180; Grinnellii, 42; 
ziesii, 180; microphyllus, 43% Munzii ii, 
40; Palmeri, 41, 42; Palm ri Grin- 
nellii, 42; petiolatus, 42; Plgamerae, 
: po he es 41; subulatus, 40; 
Perezia  Weightii, 249 
Peridermium, 193; erebrum, 192, 193 
