834 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



bilabiate; stamens 5, only 4 of them anther-bearing; ovary superior, 

 2-celled; stigma bilabiate; fruit an elongate 2-valved capsule; seeds 

 many, winged or comose. 



Key to the genera 



1. Leaves simple; seeds comose 1. Chilopsis. 



1. Leaves pinnate; seeds with hyaline wings 2. Tecoma. 



1. CHILOPSIS. Desertwillow 



Small tree or large shrub, up to 9 m. (30 feet) high; leaves alternate 

 or the lower ones opposite, simple, linear or linear-lanceolate, entire, 

 elongate ; corolla white, often tinged, streaked, or spotted with purple; 

 wing of the seed dissected into hairs. 



1. Chilopsis linearis (Cav.) Sweet, Hort. Brit. 283. 1827. 



Bignonia linearis Cav., Icon. PI. 3: 35. 1794. 



Coconino and Mohave Counties to Greenlee, Cochise, Santa Cruz, 

 Pima, and Yuma Counties, up to 4,000 (rarely 6,000) feet but usually 

 lower, mostly along washes in the deserts and foothills, April to 

 August. Western Texas to southern Nevada, Arizona, southern 

 California, and northern Mexico. 



The desertwillow is sometimes cultivated as an ornamental for the 

 sake of its attractive catalpalike flowers. It probably would be useful 

 for planting to control soil erosion. It is browsed only where more 

 palatable forage is scarce. The common form in Arizona is var. 

 arcuata Fosberg, with the sterile branchlets nearly or quite glabrous 

 and leaf veins not prominent, but Fosberg 48 mentions also Arizona 

 specimens approaching var. glutinosa (Engelm.) Fosberg, which he 

 distinguishes from var. arcuata by the glutinous herbage. 



2. TECOMA. Trumpetbush 



Shrub; leaves opposite, pinnate, the leaflets 5 or more, lanceolate, 

 long -acuminate, deeply serrate or laciniate; corolla funnelform-cam- 

 panulate, bright yellow; seeds flat, with a thin entire wing. 



1. Tecoma stans (L.) H. B. K., Nov. Gen. et Sp. 3: 144. 1818. 



Bignonia stans L., Sp. PI. ed. 2, 871. 1763. 

 Stenolobium incisum Rose and Standi., Contrib. U. S. Natl. 

 Herbarium 16: 174. 1913. 



Pinal, Santa Cruz, and Pima Counties, 3,000 to 5,500 feet, dry 

 stony or gravelly slopes, May to September. Southern New Mexico 

 and Arizona, southward into tropical America. 



The plant is much cultivated as an ornamental in the warmer parts 

 of the United States. It is stated that the roots are used in Mexico 

 medicinally and for making a sort of beer. The Arizona form, var. 

 angustatum Render, seldom exceeds a height of 2.5 m. (8 feet). 



48 Fosberg, F. Raymond, varieties of the desertwillow, chilopsis linearis. Madrono 3: 362-366. 

 1936. 



