Oxybaphus hirsutus or Mirabilis hirsuta
(Hairy Four-o`clock)
Family:
Nyctaginaceae
(Four-O'Clock)
     
The stems, leaves and calyx of Hairy Four-o'clock are pubescent. Stem leaves are sessile (attached directly, lacking a petiole). Flowers (not shown) of Hairy Four-o'clock are similar to flowers of Heartleaf Four-o'clock, but plants are often seen after the petals have dropped and the calyx remains (as in the photographed plants).

Compare to Heartleaf Four-o'clock (Mirabilis nyctaginea) , which has hairless leaves which are attached with a petiole 1 cm or longer. Stems of Heartleaf Four-o'clock are also predominantly hairless. Some references suggest that M. hirsuta and M. nyctaginea might hybridize.

Compare to Narrowleaf Four-o'clock (Mirabilis linearis), which has narrow, linear leaves.

Vegetation zone:  Plains, Foothills
Time of bloom:  June - August
Origin:  Native
Eastern Colorado Wildflowers