Galinsoga parviflora var. semicalva

A. Gray

Smithsonian Contr. Knowl. 5(6): 98. 1853.

Synonyms: Galinsoga semicalva (A. Gray) H. St. John & D. White
Treatment appears in FNA Volume 21. Treatment on page 181.

Plants 4–35 cm. Leaf blades lanceolate to ovate, 7–55(–80) × 3–20 mm, margins usually entire or serrulate, sometimes serrate. Arrays of heads congested. Axillary peduncles shorter than subtending bractlets. 2n = 32.

Phenology: Flowering summer–fall.
Habitat: Rocky slopes
Elevation: 1800–2700 m



Ariz., N.Mex., Tex., Mexico.


Plants of var. semicalva are less branched and usually have narrower leaves and shorter axillary peduncles than those of var. parviflora. They are found above 1500 m as far south as Distrito Federal, Mexico. Morphologic intermediates between the diploid var. parviflora and the tetraploid var. semicalva occur throughout the range of var. semicalva.

Selected References


Lower Taxa