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



elongate, often branched, spikelike racemes; petals none; stamens 9 or 

 10, separate, attached at base to the calyx; pods small, conspicuously 

 gland-dotted, 1-seeded. 



These plants, which reach a height of about 1 m. and are slightly 

 aromatic, occur sporadically in sandy soil in northern Arizona, often 

 forming low dunes. They are well adapted to reduce wind erosion 

 and are sometimes planted for this purpose. They are employed for 

 making baskets and brooms by the Hopi Indians, who also are re- 

 ported to use the seeds in treating toothache, and the plant as an 

 insecticide. Tests by the Bureau of Plant Industry showed the 

 insecticidal value of Parryella to be small. 



Key to the species 



1. Leaflets linear-filiform to narrowly elliptic, not more than 2 mm. wide, 5 to 

 15 mm. long; stipules minute to about 1 mm. long; racemes loose, commonly 

 more than 2 (up to 13) cm. long; calyx 3 to 4 mm. long, eglandular or 

 sparsely glandular-punctate, nearly or quite glabrous externally, often 

 conspicuously white-ciliate 1. P. filifolia. 



1. Leaflets broadly oval to nearly orbicular, 3 to 5 mm. wide, not more than 6 

 mm. long; stipules 2 to 5 mm. long; racemes dense, 1 to 2 cm. long; calyx 

 5 to 6 mm. long, conspicuously glandular-punctate, copiously pubescent on 

 the whole surface externally, densely white-villous in the throat. 



2. P. ROTUNDATA. 



1. Parryella filifolia Torr. and Gray, Amer. Acad. Arts and Sci. Proc. 



7: 397. 1868. 

 Apache County to Coconino County (a doubtful record from Fort 

 Verde, Yavapai County), 4,400 to 6,000 feet, often on rolling, treeless, 

 sandy plains with Aplopappus heterophyllus, June to August. New 

 Mexico and northern Arizona. 



2. Parryella rotundata Wooton, Torrey Bot. Club Bui. 25: 457. 



1898. 

 Known only from the type collection at Winslow, Navajo County 

 (Wooton in 1892). A specimen collected in the Petrified Forest, 

 Apache County (Harrison 5532) is intermediate between P. filifolia 

 and P. rotundata. 



25. AMORPHA. 67 False-indigo, indigobush 



Shrubs with gland-dotted herbage ; leaves odd-pinnate with numer- 

 ous rather large leaflets; flowers small, in dense terminal spikelike 

 racemes; petal one (the banner or standard only), dark violet; stamens 

 9 or 10, united below; pods small, asymmetrically clavate or obovoid, 

 gland-dotted, with 1 or 2 seeds, indehiscent or tardily dehiscent. 



Sometimes called "spicebush" in Arizona. The plants are un- 

 palatable to livestock but are effective in controlling erosion. They 

 are sometimes cultivated as ornamentals. 



Key to the species 



1. Glands (more or less spinelike) present on the twigs, petioles, and leaf rachis; 

 leaflets thin, with a dull upper surface; calyx pilose, the lobes triangular- 

 lanceolate, half as long as to equaling the tube, all acute or acutish, gland- 

 tipped; pods pubescent, asymmetrically obovate in outline; herbage soft- 

 pilose 1. A. CALIFORNICA. 



67 Reference: Palmer, E. J. coxspectus of the gexus amoepha. Arnold Arboretum Jour. 12: 157- 

 220. 1931. 



