106 TREES AND SHE1 Bfi 



seeds are produced in great profusion on the mature plans 

 This species has been variously called Covillea tridentrJa, 

 Larrea tridentata, and Larrea mexicana in different texts. 



COVILLEA vail. 



Erect, spreading, strongly scented^ evergreen, resinous shrub 

 2 meters high or less, with 2-foliolate leaves and numerous rather 

 small, bright yellow flowers; leaflets small, 5 to 10 mm. long, in- 

 equilateral, thick, sessile or connate on very short petioles; appressed 

 cent, at least when young: flowers solitary on short, axillary 

 peduncles; sepals unequal, caducous, yellow; petals obovate to spat- 

 ulate, twisted like the blades of a propeller; stamens inserted on 

 the 10-lobed disk, the filaments winged below; fruit a densely 

 hairy spheroid capsule breaking into 5 indehiscent nutlet 



A characteristic plant of the Lower Sonoran 



Zone. One species. 1. c . tjhtUnosa . 



See -•>. asi wood, p. C5. 



