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THE BOTANY OF HAYFEVER
Fig 2 Cornus florida dogwood flowers
Fig 3 Asclepias Cornuti milkweed flower and pollinia
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abundant amaranth Ambrosia amounts of pollen anemophilous appears Arizona Artemisia atmospheric pollen Bermuda grass birch botanical California catkins cause hayfever cause of hayfever cedar coast cocklebur Colorado common corolla cottonwood cultivated diameter dioecious eastern entomophilous exine factor in hayfever feet high flora Florida flower heads flowers from July Franseria furrows genera genus comprises germ pore granular HALL and CLEMENTS hayfever plants hayfever possibilities herb Illl importance in hayfever important cause insect pollinated juniper leaves little pollen llll llll llll maple marshelder Mexico monoecious mugwort native North America northern oak Q occasionally occurs operculum panicles perennial pigweed pistillate plantain pollen grains pollen grains fig pollen slides poplar quantities of pollen ragweed region reported Rocky Mountain Russian thistle sagebrush season short ragweed shrubs similar soil South southern species spheroidal spikes spines staminate stems summer Texas throughout tribe United waste places waterhemp weed westward widely distributed willow wind pollinated