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



2. Menodora scabra A. Gray, Amer. Jour. Sci. ser, 2, 14: 44. 1852. 



Apache County to Coconino County, south to Pima County, 1,500 

 to 7,000 feet, dry mesas and slopes, April to August. Western Texas 

 to southern Utah, Arizona, southeastern California, and northern 

 Mexico. 



In the southern part of the State, a form with woodier, more 

 branched, longer stems, var. ramosissima Steyermark, is commoner 

 than the typical form. The stems are sometimes nearly 1 m. long in 

 this variety. Similar to var. ramosissima except in its longer corolla 

 tube is var. longituba Steyermark, known only from the type collection 

 in the Mazatzal Mountains (Smart 213). 



99. LOGANIACEAE. Logania family 



A member of this family, Strychnos nux-vomica L., is the source of 

 the powerful drug and poison, strychnine. 



1. BUDDLEJA 



Shrubs; leaves opposite or whorled; flowers small, in dense axillary 

 clusters, these often forming leafy interrupted spikes; flowers perfect, 

 regular, normally 4-merous; anthers sessile or nearly so; fruit a capsule, 

 dehiscing apieally, usually 2-valved. 



Several exotic species are cultivated as ornamental plants, the best- 

 known one being B. davidii, known as butterflybush and summer-lilac. 

 B. sessiliflora is used medicinally in Mexico. The name of the genus is 

 usually spelled Buddleia. 



Key to the species 



1. Herbage and inflorescence usually only moderately tomentose to glabrate; 

 leaves distinctly petioled, the blades rather thin, with veins not or scarcely 

 impressed above and not very prominent beneath, lanceolate to rhombic- 

 ovate, acuminate at apex, usually tapering at base, entire or serrate, com- 

 monly at least 5 cm. long and 15 mm. wide; glomerules of flowers usually 

 about 1 cm. in diameter 1. B. sessiliflora. 



1. Herbage and inflorescence densely and conspicuously lanate-tomentose; leaves 

 sessile or nearly so, the blades thick, with veins deeply impressed above and 

 very prominent beneath, linear or narrowly oblong-elliptic, obtuse or 

 acutish at apex, crenate, seldom more than 3 cm. long and 6 mm. wide; 

 glomerules of flowers usually much less than 1 cm. in diameter. 



2. B. UTAHENSIS. 



1. Buddleja sessiliflora H. B. K., Nov. Gen. et Sp. 2: 345. 1818. 



Buddleia pringlei A. Gray, Amer. Acad. Arts and Sci. Proc. 19: 

 86. 1883. 



Valley of the Santa Cruz River and foothills of the Santa Catalina 

 Mountains, Pima County (Thornber 7571, 8097), flowering in spring. 

 Southern Arizona and Mexico. 



*2. Buddleja utahensis Coville, Biol. Soc. Wash. Pioc. 7: 69. 1892. 

 The writers have seen no specimens from Arizona, but the plant 

 occurs so near the northwestern border that it is very likely to be 

 found, eventually, within the State. 



100. GENTIANACEAE. Gentian family 



Plants herbaceous, annual or perennial, mostly glabrous; leaves 

 simple, entire, commonly opposite, sessile; flowers solitary, or in simple 



