Common Sunflower: Helianthus annuus: Asteraceae
Common Sunflower © RSWacha, 1998
Description:
Flowering heads have 16 to 30, yellow to gold, ray flowers surrounding a large central disc, that may reach up to 3.5 cm in diameter. Disc flowers are dark brown to purple. Involucral bracts are broadly ovate, with tips drawn out to a fine point. Upper leaves are smaller, broadly lance-shaped or ovate, and attach individually to the stem. Lower leaves are larger, broadly ovate, and attach individually or in pairs. The base of the leaf blade is recurved as it joins a prominent petiole. Teeth on leaf margins range from inconspicuous to clearly present. Reaches shoulder height or above. Blooms from August into September in prairies, fields, and waste areas. Native to N. A.