840 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 

 5. CARLOWRIGHTIA 



Plants straggling undershrubs with slender branches; leaf blades 

 entire, linear to ovate-lanceolate; flowers few, in spikes, racemes, or 

 panicles; corolla imbricate in the bud, purple, or white streaked with 

 purple, the tube narrow, the limb 4-cleft; stamens 2; capsule flat- 

 tened, acuminate at apex, stalked; seeds flat. 



Key to the species 



1. Leaf blades narrowly linear; flowers in narrow racemelike panicles; corolla 

 purple, the lobes 5 to 7 mm. long; filaments hirsutulous; anthers sagittate; 

 herbage puberulent 1. C. linearifolia. 



1. Leaf blades lanceolate or ovate-lanceolate; flowers in interrupted spikes, these 

 often forming a very open, few-flowered, leafy panicle; corolla white, 

 the upper (posterior) lobe with a median yellow spot bordered by purple, 

 the lobes 8 to 12 mm. long; filaments glabrous; anthers not sagittate, at 

 most subcordate at base; herbage finely canescent or hirsutulous. 



2. C. ARIZONICA. 



1. Carlowrightia linearifolia (Torr.) A. Gray, Amer. Acad. Arts 



andSci. Proc. 13: 364. 1877. 



Schaueria linearifolia Torr., U. S. and Mex. Bound. Bot. 123. 



1859. 



Graham County, near SafTord and Matthews, 2,500 to 3,000 feet, 

 mesas and washes, August and September. Western Texas to south- 

 eastern Arizona. 



2. Carlowrightia arizonica A. Gray, Amer. Acad. Arts and Sci. Proc. 



13: 364. 1877. 



Maricopa, Cochise, Santa Cruz, Pima, and Yuma Counties, 2,500 

 to 4,000 feet, rather common on dry stony slopes, April and May, 

 type from Camp Grant, Graham County (Palmer in 1867). Southern 

 Arizona and northwestern Mexico. 



The plant is browsed by cattle and sheep. There is much variation 

 in appearance in different seasons or at different stages of growth. 

 Typically the flowers are in slender, elongate, interrupted spikes, 

 with the floral leaves reduced to small bracts, but there also occurs a 

 more compact form with flowers scattered in the axils of well-developed 

 leaves. 



6. ANISACANTHUS 



A shrub, up to 2.5 m. (8 feet) high, with rather stout branches and 

 whitish exfoliating bark; leaves short-petioled, the blades lanceolate 

 or ovate-lanceolate; corolla normally brick red, sometimes yellow or 

 orange, the tube long and slender, the limb bilabiate, the lower lip 

 3-parted; capsule flattened, long-stalked. 



1. Anisacanthus thurberi (Torr.) A. Gray, Syn. Fl. 2 *: 328. 1878. 



Drejera thurberi Torr., U. S. and Mex. Bound. Bot. 124. 1859. 



Greenlee County to Yavapai County, south to Cochise, Santa 

 Cruz, Pima, and Yuma Counties, 2,500 to 5,200 feet, mostly in can- 

 yons and along washes, flowering almost throughout the year but 

 chiefly in spring. Southwestern New Mexico, Arizona, and northern 

 Mexico. 



Known as chuparosa and desert -honeysuckle. The plant is browsed 

 by cattle and sheep, especially when other forage is scarce. 



