Helianthus occidentalis Riddell

Naked-Stemmed Sunflower

Helianhus occidentalis plant

Family - Asteraceae

Stems - No info. yet.

Helianhus occidentalis stemUpper stem.

Helianhus occidentalis stemLower stem.

Leaves - No info. yet.

Helianhus occidentalis basalsBasal leaves.

Helianhus occidentalis leavesCauline leaves.

Inflorescence - No info. yet.

Involucre - No info. yet.

Helianhus occidentalis involucreInvolucre.

Ray flowers - No info. yet.

Disk flowers - No info. yet.

Helianhus occidentalis flowers

Flowering - July - September.

Habitat - Glades, prairies, dry meadows, fields, rocky open woods.

Origin - Native to U.S.

Other info. - This small species can be found in the Ozark region of Missouri. This plant can be identified in the field by its small size (it grows only to about 1m tall), its mostly basal leaves, and its thin involucre bracts (phyllaries). The flowering stems of this species are naked or have reduced leaves for most of their total length.
Our plants belong to variety occidentalis.

Photographs taken off Hwy 21, Reynolds County, MO., 8-20-03.