Senna bauhinioides (A. Gray) Irwin & Barneby
Family: Fabaceae
twinleaf senna,  more...
[Cassia bauhinioides A. Gray,  more]
Senna bauhinioides image
Max Licher  
Senna bauhinioides is a spreading low plant with gray-green foliage. The yellow flowers frequently only partly open. The fruit is a plump pod. The leaves are paired. Senna bauhinioides is found in dry sandy areas at lower elevation.
Correll and Johnston 1970, Allred and Ivey 2012
Duration: Perennial Nativity: Native Lifeform: Subshrub General: Perennial herb to subshrub, 10-40 cm tall, from slender woody rootstock; stems several, ascending-spreading and usually branched, gray-tomentose, sometimes slightly woody near the base. Leaves: Alternate, on slender ascending petioles, 1-3 cm long, with linear stipules 3-6 mm long; at the end of each petiole there is a slender erect gland and one pair of leaflets; leaflets oblong, 1-3 cm long and 5-12 mm wide with a rounded tip and a strongly asymmetric, rounded base; leaflet surfaces silky-pubescent and slightly cinereous (ash-colored from the hairs). Flowers: Yellow, in few-flowered panicles at branch tips, on peduncles 2-4 cm long; flowers about 3 cm wide, appearing mostly radially symmetrical (caesalpinioid); sepals 5, oblong, 6-8 mm long, hairy, green with yellowish margins; petals 5, yellow, 12-18 mm long, with brown veins that are especially distinct when flowers are dried. Fruits: Pods oblong and curved into a slight hook shape, 2-4 cm long and 5-6 mm wide, dark brown and pubescent; splitting open along 2 suture lines to release 8-15 seeds. Ecology: Found on gravelly flats and plains, along washes, and rocky slopes, from 2,000-5,500 ft (610-1676 m); flowers April-August. Distribution: AZ, NM, TX; south to n MEX. Notes: Distinguished by being an erect-ascending perennial; each leaf consisting of 1 pair of gray-green leaflets (S. covesii has 3-4 pairs per leaf) which are silky-pubescent and have small, erect glands at the bases (use your hand lens); the bright yellow, showy caesalpinoid flowers; and pods which "elastically" dehisce, sending seeds flying, the shells becoming brown and hard and peeling backward. Ethnobotany: Unknown, but other species in the genus have uses. Etymology: Senna is from Arabic word sana, meaning bright and clear, alluding to the laxative nature of the leaves and pods; bauhinioides means resembling the genus Bauhinia, which also has leaflets in pairs. Synonyms: Cassia bauhinioides Editor: SBuckley 2010, FSCoburn 2015, AHazelton 2017
Senna bauhinioides image
Max Licher  
Senna bauhinioides image
Max Licher  
Senna bauhinioides image
Patrick Alexander  
Senna bauhinioides image
Patrick Alexander  
Senna bauhinioides image
Sue Carnahan  
Senna bauhinioides image
Ries Lindley  
Senna bauhinioides image
Sue Carnahan  
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
David Thornburg  
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
David Thornburg  
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
David Thornburg  
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image
Senna bauhinioides image