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



7. Baccharis neglecta Britton in Britt. and Brown, Illus. Fl. 3: 394. 



1898. 



Known in Arizona only by a collection in the Huachnca Mountains, 

 Cochise County (Lemmon in 1882). Nebraska to Texas, and Ari- 

 zona to northern Mexico. 



The only Arizona specimen examined, from Cave Canyon, Hua- 

 chuca Mountains (Lemmon in 1882), is somewhat dubious, having 

 the leaves considerably broader than normal but having the small 

 pistillate heads of B. neglecta. Gray 67 referred this collection to 

 B. angustifolia Michx. of which B. neglecta is a segregate. 



8. Baccharis thesioides H. B. K., Nov. Gen. et Sp. 4: 61. 1820. 

 Mountains of Cochise, Santa Cruz, and Pima Counties, 4,000 to 



8,000 feet, August and September. Southwestern New Mexico and 

 southern Arizona, south to central Mexico. 

 Plants up to 2 m. high. 



9. Baccharis bigelovii A. Gray in Torr., U. S. and Mex. Bound. Bot. 



84. 1859. 

 Chiricahua and Mule Mountains (Cochise County), 5,000 to 6,000 

 feet, September. Southwestern Texas, southeastern Arizona, and 

 northern Mexico. 



10. Baccharis glutinosa Pers., Syn. PL 2: 425. 1807. 



Grand Canyon (Coconino County), to Cochise, Santa Cruz, Pima, 

 and Yuma Counties, up to 5,700 feet, but usually lower, very common 

 along watercourses, often forming thickets, March to December. 

 Colorado and Texas to California and Mexico; South America. 



Seepwillow, also known as waterwillow, waterwally, and water- 

 motie. Plants up to at least 2.2 m. high. 



11. Baccharis viminea DC, Prodr. 5: 400. 1836. 



Willow Springs Mountains (Griffiths 3647), near the mouth of the 

 Gila River, Yuma County (Monnet 1057), spring and late summer. 

 Southwestern Utah and western Arizona to California. 



31. PLUCHEA. Marsh-fleabane 



Herbs or shrubs; leaves alternate; heads small, disciform, in ter- 

 minal cymes or panicles, the corollas purplish; involucre graduated, 

 the bracts chartaceous to subscarious; receptacle naked; outer flowers 

 pistillate, with a tubular -filiform corolla, the inner hermaphrodite; 

 achenes small, 4- or 5-ribbed; pappus of capillary bristles; anthers 

 caudate at base. 



The rank-smelling arrowweed (P. sericea) forms dense thickets in 

 stream beds and in moist saline soil at relatively low elevations. It 

 is browsed by deer and sometimes by cattle and horses. The straight 

 stems are used by the Pima Indians in constructing the roofs and 

 walls of primitive huts, for making baskets, and, formerly, for arrow 

 shafts. An infusion of the herbage was used as a remedy for sore 

 eyes. The flowers are reported to be an important source of honey 

 in Arizona. 



67 Gray, Asa. synoptical flora of north America 1 2 : 1884. (See p. 222.) 



