SCIENTIFIC NAME: Populus
COMMON NAME(S): Poplars, Cottonwoods, Aspen
FAMILY: SALICACEAE - Willow family
ORIGIN: Northern Hemisphere, about 35 spp.
HABITAT: Woods, cultivated landscapes
HEIGHT: Up to 120'
LEAVES: Alternate, oval shaped or triangular, smooth or toothed along margin, often with glands at base
FLOWERS: Inconspicuous, separate male and female borne in pendent short spikes (catkins)
FLOWERING SEASON: Spring
FRUITS: Capsules containing small seeds with cotton-like tuft of hair
ALLERGENIC PRINCIPLES: Pollen oil (oleoresins),pollen proteins
ALLERGENIC PROPERTIES: Dermatological, respiratory
COMMENTS: In rare cases, the oil contained in the pollen of these trees has caused a skin rash and blistering. The airborne pollen does contribute to the misery of hay fever sufferers. The Eastern cottonwood, P. deltoides Marsh., is the most common in the southeastern United States.