SCIENTIFIC NAME: Alnus serrulata
COMMON NAME(S): Brookside alder, Hazel alder
FAMILY: BETULACEAE - Birch family
ORIGIN: Mostly temperate Northern Hemisphere, 35-40 spp.
HABITAT: Woods, cultivated landscapes
CHARACTERISTICS: Bark usually thin and smooth with numerous pores
LEAVES: Alternate, simple, usually broadest near the base with a single or double row of teeth along the margins
FLOWERS: Separate male and female flowers borne on hanging clusters (catkins)
FLOWERING SEASON: Spring
FRUITS: Small, cone-like clusters
ALLERGENIC PRINCIPLES: Pollen allergens
ALLERGENIC PROPERTIES: Respiratory
COMMENTS: The alders produce abundant windborne pollen with significant allergenic activity. Hazel alder (A. serrulata) is the most common species in the southeastern United States.