Hay fever pollen
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Hay fever pollen

1 Dactylis glomerata
GRAMINEAE
variegated orchard grass Jun 01 - Aug 31 Strong
2 Dicoria canescens
COMPOSITAE
silver ragweed Sep 01 - Jan 31 Strong
3 Distichlis spicata
GRAMINEAE
coastal salt grass Jun 01 - Sep 30 Light
4 Distichlis stricta
GRAMINEAE
desert salt grass May 01 - Jul 31 Light
5 Echinochloa crus-galli
GRAMINEAE
barnyard grass Jun 01 - Oct 31 Light
6 Elymus condensatus
giant ryegrass Jun 01 - Aug 31 Light
7 Elymus glaucus
western ryegrass
lyme grass
wild rye
Jun 01 - Aug 31 Light
8 Elymus triticoides
alkali ryegrass Jun 01 - Aug 31 Light
9 Encelia farinosa
COMPOSITAE
brittlebrush
incienso
Mar 01 - May 31 Light
10 Epilobium angustifolium
EPILOBIACEAE
fireweed
willow herb
Jul 01 - Sep 30 Light
11 Eschscholzia californica
ESCHSCHOLZIACEAE
California poppy Feb 01 - Sep 30 Light
12 Eucalyptus globulus
blue gum
eucalyptus
Dec 01 - May 31 Light
13 Eurotia lanata
CHENOPODIACEAE
winterfat Mar 01 - Jun 30 Light
14 Fagus grandifolia
FAGACEAE
American beech Mar 01 - May 31 Light
15 Festuca elatior
FESTUCACEAE
meadow fescue May 01 - Aug 31 Strong
16 Festuca ovina
FESTUCACEAE
sheep fescue May 01 - Aug 31 Strong
17 Festuca rubra
FESTUCACEAE
red fescue Jun 01 - Aug 31 Strong
18 Franseria acanthicarpa
COMPOSITAE
false ragweed
sandbur
Aug 01 - Nov 30 Strong
19 Franseria ambrosioides
COMPOSITAE
canyon ragweed Mar 01 - Jun 30 Strong
20 Franseria bipinnatifida
COMPOSITAE
beachbur Mar 01 - Sep 30 Light
21 Franseria chamissonis
COMPOSITAE
San Francisco beachbur Jul 01 - Sep 30 Light
22 Franseria deltoidea
COMPOSITAE
rabbitbrush Mar 01 - May 31 Strong
23 Franseria dumosa
COMPOSITAE
burroweed
desert ragweed
Mar 01 - May 31 Strong
24 Franseria tenuifolia
COMPOSITAE
slender ragweed May 01 - Nov 30 Strong
25 Fraxinus americana
FRAXINACEAE
American white ash Mar 01 - May 31 Light
26 Fraxinus nigra
FRAXINACEAE
black ash Mar 01 - May 31 Light
27 Fraxinus oregona
FRAXINACEAE
Oregon ash Jan 01 - May 31 Light
28 Fraxinus pennsylvanica
FRAXINACEAE
green ash
red ash
Mar 01 - May 31 Light
29 Fraxinus uhdei
FRAXINACEAE
shamel ash
Mexican ash
Dec 01 - Feb 28 Light
30 Fraxinus velutina
FRAXINACEAE
Arizona velvet ash Mar 01 - Apr 30 Light
31 Garrya elliptica
GARRYACEAE
wavyleaf silktassel
silktassel bush
Jan 01 - Mar 31 Light
32 Grayia spinosa
CHENOPODIACEAE
spiny hopsage Mar 01 - Jun 30 Light
33 Gutierrezia dracunculoides
COMPOSITAE
broomweed Jul 01 - Oct 31 Light
34 Helianthus spp.
HELIANTHACEAE
sunflower Feb 01 - Oct 31 Light
35 Hemizonia spp.
COMPOSITAE
tarweed Apr 01 - Nov 30 Light
36 Holcus lanatus
velvet grass Jul 01 - Sep 30 Strong
37 Hordeum murinum
HORDEACEAE
wall barley Jun 01 - Jul 31 Light
38 Hordeum vulgare
HORDEACEAE
six-rowed barley May 01 - Jun 30 Light
39 Humulus lupulus
hops Jun 01 - Sep 30 Light
40 Hymenoclea monogyra
COMPOSITAE
singlewhorl burrobrush Aug 01 - Nov 30 Strong
41 Hymenoclea salsola
COMPOSITAE
burrobrush Mar 01 - Jun 30 Strong
42 Iva angustifolia
August marshelder Sep 01 - Oct 31 Light
43 Iva axillaris
small povertyweed May 01 - Sep 30 Light
44 Iva ciliata
poverty weed
rough marshelder
May 01 - Aug 31 Strong
45 Iva xanthifolia
giant sumpweed
giant povertyweed
Jul 01 - Sep 30 Light
46 Juglans californica
JUGLANDACEAE
California walnut Apr 01 - May 31 Light
47 Juglans cinerea
JUGLANDACEAE
butternut
white walnut
Apr 01 - May 31 Light
48 Juglans hindsii
JUGLANDACEAE
Northern California walnut
Hinds black walnut
Apr 01 - May 31 Light
49 Juglans nigra
JUGLANDACEAE
black walnut
American walnut
Apr 01 - May 31 Light
50 Juglans regia
JUGLANDACEAE
English walnut
Geinn
okhar
Apr 01 - May 31 Light
51 Juglans rupestris
JUGLANDACEAE
Arizona walnut Mar 01 - May 31 Light
52 Juglans sieboldiana
JUGLANDACEAE
Japanese walnut Apr 01 - May 31 Light
53 Juniperus californica
JUNIPERACEAE
California juniper May 01 - Mar 31 Light
54 Juniperus chinensis
JUNIPERACEAE
Chinese juniper Jan 01 - Apr 30 Light
55 Juniperus monosperma
JUNIPERACEAE
one-seed juniper Mar 01 - May 31 Light
56 Juniperus occidentalis
JUNIPERACEAE
western juniper May 01 - Jun 30 Light
57 Juniperus pinchotii
JUNIPERACEAE
pinchot juniper Mar 01 - May 31 Light
58 Juniperus sabinoides
JUNIPERACEAE
mountain juniper Dec 01 - Feb 28 Light
59 Juniperus scopulorum
JUNIPERACEAE
Rocky Mountain juniper May 01 - Jun 30 Light
60 Juniperus utahensis
JUNIPERACEAE
Utah juniper Mar 01 - May 31 Light
61 Juniperus virginiana
JUNIPERACEAE
Virginia juniper
red cedar
Eastern red cedar
Mar 01 - Apr 30 Light
62 Kochia scoparia
Mexican firebush Aug 01 - Oct 31 Strong
63 Koeleria cristata
GRAMINEAE
koeler grass
Junegrass
May 01 - Jul 31 Light
64 Larix occidentalis
western larch
tamarack
May 01 - Jun 30 Light
65 Lathyrus odoratus
LATHYRACEAE
sweet pea Jan 01 - Dec 31 Light
66 Libocedrus decurrens
CUPRESSACEAE
incense cedar Apr 01 - May 31 Light
67 Ligustrum lucidum
LIGUSTRACEAE
glossy privet
southern privet
Mar 01 - May 31 Light
68 Ligustrum ovalifolium
LIGUSTRACEAE
California privet Mar 01 - May 31 Light
69 Ligustrum vulgare
LIGUSTRACEAE
European privet Apr 01 - Jul 31 Light
70 Liquidambar styraciflua
sweet gum
red gum
May 01 - May 31 Light
71 Lolium multiflorum
Italian ryegrass
annual ryegrass
May 01 - Jul 31 Strong
72 Lolium perenne
perennial ryegrass May 01 - Jul 31 Strong
73 Lolium temulentum
darnel Apr 01 - Jun 30 Strong
74 Maclura pomifera
MORACEAE
osage orange
hedge apple
bois d'arc
horse apple
bow-wood
Apr 01 - May 31 Light
75 Medicago sativa
LEGUMINOSAE
alfalfa May 01 - Oct 31 Light
76 Melica imperfecta
MELICACEAE
California melic Apr 01 - May 31 Light
77 Melilotus spp.
LEGUMINOSAE
sweet clover May 01 - Nov 30 Light
78 Morus alba
MORACEAE
white mulberry
sang ye
Mar 01 - May 31 Light
79 Morus rubra
MORACEAE
red mulberry Mar 01 - May 31 Light
80 Morus tatarica
MORACEAE
black mulberry Mar 01 - May 31 Light
81 Myrica gale
MYRICACEAE
sweetgale
pors
post
bog myrtle
Roid
Apr 01 - Jun 30 Light
82 Olea europaea
OLEACEAE
olive Jan 01 - Dec 31 Light
83 Osmunda regalis
OSMUNDACEAE
royal fern Jun 01 - Sep 30 Light
84 Ostrya virginiana
CORYLACEAE
hop hornbeam
ironwood
Mar 01 - Apr 30 Light
85 Paspalum dilatatum
PASPALACEAE
dallis grass Apr 01 - Oct 31 Light
86 Paspalum distichum
PASPALACEAE
knotgrass Aug 01 - Oct 31 Light
87 Phalaris canariensis
PHALARIDACEAE
annual canarygrass Jun 01 - Aug 31 Light
88 Phalaris minor
PHALARIDACEAE
littleseed canarygrass Apr 01 - Jul 31 Light
89 Philadelphus spp.
PHILADELPHACEAE
mock orange May 01 - Jun 30 Light
90 Phleum pratense
Timothy Jun 01 - Aug 31 Strong
91 Phlox spp.
phlox Mar 01 - Jun 30 Light
92 Phoenix canariensis
PHOENICACEAE
Canary Island date palm Mar 01 - May 31 Light
93 Phoenix dactylifera
PHOENICACEAE
date palm Mar 01 - May 31 Light
94 Picea pungens
PICEACEAE
Colorado blue spruce Jun 01 - Jul 31 Light
95 Picea rubens
PICEACEAE
red spruce Apr 01 - Jul 31 Light
96 Picea sitchensis
PICEACEAE
Sitka spruce May 01 - May 31 Light
97 Pinus canariensis
PINACEAE
Canary Island pine Mar 01 - May 31 Light
98 Pinus contorta
PINACEAE
lodgepole pine Jun 01 - Jul 31 Light
99 Pinus echinata
PINACEAE
shortleaf pine
yellow pine
Mar 01 - May 31 Light
100 Pinus edulis
PINACEAE
pinyon pine Mar 01 - May 31 Light
101 Pinus monophylla
PINACEAE
single-leaf pine May 01 - May 31 Light
102 Pinus monticola
PINACEAE
western white pine May 01 - Jun 30 Light
103 Pinus palustris
PINACEAE
longleaf pine Mar 01 - May 31 Light
104 Pinus ponderosa
PINACEAE
ponderosa pine
western yellow pine
May 01 - Jun 30 Light
105 Pinus radiata
PINACEAE
Monterey pine Apr 01 - Apr 30 Light
106 Pinus resinosa
PINACEAE
red pine
Norway pine
Mar 01 - May 31 Light
107 Pinus sabiniana
PINACEAE
California foothill pine
bull pine
digger pine
Apr 01 - May 31 Light
108 Pinus strobus
PINACEAE
eastern white pine Mar 01 - May 31 Light
109 Pinus taeda
PINACEAE
loblolly pine Mar 01 - May 31 Light
110 Pinus thunbergii
PINACEAE
Japanese pink
black pine
Mar 01 - May 31 Light
111 Pinus virginiana
PINACEAE
Virginia scrub pine
Jersey pine
Mar 01 - May 31 Light
112 Plantago lanceolata
PLANTAGINACEAE
English plantain
buckhorn
ribwort plantain
Jun 01 - Sep 30 Strong
113 Plantago major
PLANTAGINACEAE
common plantain Jan 01 - Dec 31 Light
114 Platanus acerifolia
PLATANACEAE
mapleleaf sycamore Mar 01 - May 31 Light
115 Platanus occidentalis
PLATANACEAE
eastern sycamore
buttonwood
Mar 01 - May 31 Light
116 Platanus orientalis
PLATANACEAE
oriental planetree
sycamore
London plane
Mar 01 - May 31 Light
117 Platanus racemosa
PLATANACEAE
western sycamore Feb 01 - Apr 30 Light
118 Poa annua
POACEAE
annual bluegrass
low speargrass
Mar 01 - Aug 31 Strong
119 Poa compressa
POACEAE
Canada bluegrass Jun 01 - Aug 31 Strong
120 Poa pratensis
POACEAE
Kentucky bluegrass May 01 - Oct 31 Strong
121 Poa sandbergii
POACEAE
sandberg bluegrass Apr 01 - Aug 31 Strong
122 Poa scabrella
POACEAE
pine bluegrass Apr 01 - Jul 31 Strong
123 Poa trivialis
POACEAE
rough bluegrass
shady bluegrass
May 01 - Jul 31 Strong
124 Polystichum munitum
Christmas fern
sword fern
Jun 01 - Sep 30 Light
125 Populus alba
SALICACEAE
white poplar
silver poplar
Mar 01 - Apr 30 Light
126 Populus balsamifera
SALICACEAE
balsam poplar
western balsam
Mar 01 - Apr 30 Light
127 Populus deltoides
SALICACEAE
cottonwood
Carolina poplar
Mar 01 - Apr 30 Light
128 Populus fremontii
SALICACEAE
Fremont cottonwood Mar 01 - Apr 30 Light
129 Populus nigra
SALICACEAE
black poplar Mar 01 - Apr 30 Light
130 Populus nigra var. italica
SALICACEAE
lombardy poplar Mar 01 - Apr 30 Light
131 Populus tremuloides
SALICACEAE
quaking aspen
trembling aspen
quiverleaf
Mar 01 - May 31 Light
132 Populus trichocarpa
SALICACEAE
black cottonwood
western balsam
Feb 01 - Apr 30 Light
133 Prosopis juliflora
LEGUMINOSAE
mesquite
mizquitl
Apr 01 - Jun 30 Light
134 Prunus cerasus
PRUNACEAE
sour cherry Mar 01 - May 31 Light
135 Prunus domestica
PRUNACEAE
plum Mar 01 - May 31 Light
136 Prunus persica
PRUNACEAE
peach Mar 01 - May 31 Light
137 Pseudotsuga menziesii
PINACEAE
douglas fir Apr 01 - May 31 Light
138 Pteridium aquilinum
PTERIDIACEAE
bracken fern
Bun Rainich
brake
Jun 01 - Aug 31 Light
139 Pyrus communis
PYRACEAE
European pear Mar 01 - May 31 Light

Last reviewed November 01, 2004   

 

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