Galinsoga parviflora var. semicalva
Smithsonian Contr. Knowl. 5(6): 98. 1853.
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.