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Small-headed tarweed is an annual with stems up to 10 cm (4 in) high, and long, slender branches from near the base. The (usually) opposite leaves, 1-2 cm long, are linear and long-pointed. Foliage is sparsely hairy below and glandular above. Small clusters of flower heads occur on the ends of the short terminal branches. Each head has 3-5 glandular, involucral bracts, 2-4 mm high, enclosing a r...

Dwarf Goldenweed is a low shrub with rigid, intricately branched stems that are up to 3 dm high. The spreading, alternate, entire-margined leaves are linear to narrowly lance-shaped, 10-15 mm long, and occur on the upper half of the stems. Clusters of much smaller leaves are borne in principal leaf axils. The stems and foliage are resinous. Few to several flower heads are borne on short stalks o...

Slender Hareleaf is an annual with simple or branched stems that are 1-6 dm high. The alternate, narrowly lance-shaped, entire-margined leaves lack petioles and are 1-8 cm long, becoming smaller upward. The foliage is densely covered with short, white hair, especially above. Short-stalked flower heads are borne in small, loose clusters at the tips of branches that arise from the axils of the upp...

Joe-pye Weed is a stout, fibrous-rooted, herbaceous perennial that can be up to 1.5 m tall. The lance-shaped leaves are 6-20 cm long, have serrated edges, and occur in whorls of 3-4 on the stem. The foliage is covered with short, curled hairs. Flowerheads are arranged in a flat-topped, umbrella-like inflorescence at the top of the stem. Each head has 2-3 series of a few overlapping, purplish inv...