Senna bauhinioides, Twinleaf Senna
Scientific Name: Senna bauhinioides
Common Name: Twinleaf Senna
Family: Fabaceae or Leguminosae Family
Synonyms: (Cassia bauhinioides, Cassia bauhinioides var. arizonica)
Size: Low growing up to 20 inches or more.
Growth Form: Forb/herb, subshrub;
Leaves: Green, grayish-green; compound-like with 2 leaflets, a major difference from Senna covesii
Flower Color: Yellow; flowers in cluster of 1 to 3, short flowering stalk, fruit a legume.
Flowering Season: April to August.
Elevation: 2,000 to 5,000 feet.
Habitat Preferences: Dry rocky slopes and mesas.
Recorded Range: In the United States, Twinleaf Senna is found in Arizona, New Mexico and Texas. In Arizona is occurs in the western and southeastern parts of the state, the south half of New Mexico and western Texas south of New Mexico and mostly east of the Rio Grande River and further south. It is also native to northern and northeast Mexico in Chihuahua, Coahuila, Durango, Sonora and Tamaulipas.
U.S. Weed Information: No information available.
Invasive/Noxious Weed Information: No information available.
Wetland Indicator: No information available.
Threatened/Endangered Information: No information available.
Genus Information: 59 species in Senna throughout most of the eastern half and southern half of the United States and in Ontario, Canada. 9 species in Arizona, 8 species in California. Several members of the genus Senna have been re-classified from Cassia.
The Plant List includes 1,225 scientific plant names of species rank for the genus Senna. Of these 272 are accepted species names.
Comments: The type species of Cassia bauhinioides var. arizonica was collected from the Mule Mountains, Cochise County, Arizona.
Twinleaf Cassia and Coves' Cassia generally occupy the same habitat although Coves' Cassia is much more common at lower elevations. Also, Twinleaf Senna will be observed blooming much later in the year, especially following a heavy monsoon.