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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