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



2. Jatropha cardiophylla (Torr.) Muell. Arg. in DC, Prodr. 15 2 : 



1079. 1866. 



Mozinna cardiophyUa Torr., U. S. and Mex. Bound. Bot. 198. 

 1859. 



Southwestern Maricopa County and from the Rincon Mountains 

 to the Papago Indian Reservation (Pima County), 2,000 to 3,000 

 feet, dry plains, mesas, and foothills. Southern Arizona and Sonora. 



Sangre-de-Cristo , sangre-de-drago . A handsome shrub with shining- 

 green heart-shaped leaves. The roots contain both tannin and a red 

 dye and were used by the natives of Arizona and Mexico for tanning 

 hides. The clear sap coagulates quickly on contact with air and can 

 be used for stanching the flow of blood from slight wounds. 



3. Jatropha canescens (Benth.) Muell. Arg. in DC, Prodr. 15 2 : 



1079. 1866. 



Mozinna canescens Benth., Bot. Voy. Sulph. 52. 1844. 



A single collection by Edward Palmer, without particular locality, 

 is the only one purporting to have come from Arizona. Sonora and 

 Baja California. 



4. Jatropha spathulata (Ortega) Muell. Arg. in DC, Prodr. 15 2 : 



1081. 1866. 



Mozinna spathulata Ortega, Hort. Matr. Dec. 105. 1799. 



Agua Dulce and Growler Mountains and Quitobaquito (Pima 

 County), Tule Tank and Tinajas Altas (Yuma County), about 1,000 

 feet, dry mesas and slopes. Southwestern Arizona, Sonora, and Baja 

 California. 



Sangre-de-drago. A much branched shrub up to 2 m. high. The 

 Arizona plant is referred provisionally to var. sessilifiora (Hook, f.) 

 Muell. Arg., but appears distinct. Detailed study of adequate material 

 will be necessary for a final disposal. The plant is reported to have 

 been employed in Mexico medicinally and for the manufacture of 

 various articles from the tough, flexible stems. 



10. CNIDOSCOLUS 78 



Perennial herb; leaves long-petioled, the lobes attenuate and 

 slenderly toothed; stipules thin, lacerate; cymes terminal on the stems 

 and branches; staminate calyx white, petaloid, 5-lobed, the stamens 

 10, the staminodia 3, filiform, the filaments united into a column with 

 a ring of hairs at base, the anthers in 2 whorls of 5, the glands united 

 with the androphore just beneath the ring of hairs; pistillate calyx 

 white, petaloid, 5-merous, the sepals distinct, caducous, the ovary 

 3-celled, the ovules solitary, the styles 3, connate below, twice bifid 

 above; seeds large, carunculate. 



1. Cnidoscolus angustidens Torr., U. S. and Mex. Bound. Bot. 198* 

 1859. 



Cochise, Santa Cruz, and Pima Counties, 2,300 to 4,000 feet, 

 rocky slopes. Southern Arizona, Sonora, and Baja California. 



Mala-mujer. A handsome plant with transparent stinging hairs 

 from conspicuous white pustulate bases. 



78 Reference: Wheeler, L. C. pedilanthus and cnidoscolus proposed for conservation. Gray 

 Herbarium Contrib. 124: 47-52. 1939. 



