Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Senna hirsuta v glaberrima, Woolly Senna

Senna hirsuta v glaberrima, Woolly Senna Senna hirsuta v glaberrima, Woolly Senna Senna hirsuta v glaberrima, Woolly Senna Senna hirsuta v glaberrima, Woolly Senna

Scientific Name: Senna hirsuta var. glaberrima
Common Name: Woolly Senna
Also Called: Woolly Wild Sensitive Plant and Woolly Wild Sensitive-plant
Family: Fabaceae or Leguminosae Family
Synonyms: (Cassia leptocarpa, Cassia leptocarpa var. glaberrima, Cassia gooddingii)
Status: Native
Duration: Perennial
Size: Up to 6 feet or more.
Growth Form: Forb/herb; shrub, subshrub or tree; in the southwest an upright plant with a semi-woody base, multiple stems, pubescent.
Leaves: Green; alternate, pubescent, pinnately compound, petioles, 2 to 6 pairs of leaflets, leaflets variable elliptic to ovate, stipules present.
Flower Color: Yellow to deep orange-yellow; flowers with prominent darker brown veins as flower matures, flowers in large terminal panicles in 2 to 8 clusters, fruit a legume, pods slightly curved and pubescent.
Flowering Season: July to September.
Elevation: 2,500 to 5,500 feet.
Habitat Preferences: Along streams and washes.
Recorded Range: Relatively rare in the United States, Woolly Senna is found in southern Arizona and southwest New Mexico. It is also native to Mexico, South America and the West Indies. A widespread weed in tropical Africa and Asia. The exact origin may be unknown.

U.S. Weed Information: No information available.
Invasive/Noxious Weed Information: No information available.
Wetland Indicator: In North America Senna hirsuta has the following wetland designations; Arid West, FACU; Western Mountains Valleys, and Coast, FACU. FACU, Facultative Upland, usually occur in non-wetlands, but may occur in wetlands
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.

3 varieties in Senna hirsuta in the United States:
Senna hirsuta var. glaberrima, Woolly Senna (AZ, NM only)
Senna hirsuta var. hirsuta, Woolly Senna
Senna hirsuta var. leptocarpa

Comments: There is slight information published or on-line, available for Woolly Senna. The type specimen for Cassia leptocarpa var. glaberrima was collected from southern Arizona; the type specimen for Cassia Gooddingii was collected (Goodding 2431) from the Huachuca Mountains.

Also see Twinleaf Senna, Senna bauhinioides, Coves' Cassia, Senna covesii and Baja California Senna, Senna purpusii.

Date Profile Completed: 09/08/2015, updated, 09/14/2015
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles, California, as Cassia leptocarpa.
Flora of Zimbabwe; accessed 09/08/2015
SEINet for synonyms, scientific names, recorded geographic locations and general information
The Plant List (2013). Version 1.1. Published on the Internet; (accessed 09/08/2015).
USDA – Wetland species information:
Arid West, FACU, Western Mountains, Valleys, and Coast, FACU