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



1. Palafoxia linearis (Cav.) Lag., Gen. et Sp. PL 26. 1816. 

 Ageratum lineare Cav., Icon. PI. 3: 3. 1795. 



Northern Mohave and western Maricopa Counties to southern 

 Yuma County, up to 2,000 feet, sandy plains and mesas, February 

 to November. Southern Utah, southern Nevada, western Arizona, 

 southeastern California, and northern Mexico. 



A large coarse form, var. gigantea M. E. Jones (var. arenicola A. 

 Nels.), 1 to 2 m. high, with larger leaves and heads (the involucre 

 1.5 to 2 cm. high, the achenes 1.5 to 1.8 cm. long), occurs on sand 

 dunes in the vicinity of Yuma. 



This plant, known in California as Spanish-needles, apparently is 

 rapidly spreading eastward along highways in Arizona. 



93. ERIOPHYLLUM.^ 6 Woolly-daisy 



Tomentose herbs or shrubs; leaves alternate or opposite, entire to 

 bipinnatifid; heads small, radiate or discoid, yellow or the rays some- 

 times white or rosy; achenes slender, 4- or 5-angled; pappus of 4 to 12 

 squamellae or paleae, rarely wanting. 



Key to the species 



1. Suffrutescent, up to 0.5 m. high; leaves pinnatifid or bipinnatifid with very 

 narrow segments; heads cymosely clustered, pedicellate, radiate, yellow. 



1. E. CONFERTIFLORUM. 



1. Dwarf annuals; leaves entire, or few-toothed or -lobed (2). 

 2. Heads clustered at the tips of the stem and branches, sessile; pappus of 

 laciniate squamellae (sometimes wanting in the disk flowers) ; anther 

 tips obtuse (3). 



3. Rays present 2. E. multicaule. 



3. Rays wanting 3. E. pringlei. 



2. Heads solitary at the tips of the stem and branches, pedunculate; pappus of 

 entire or merely erose squamellae; anther tips elongate, linear-subulate 

 (4). 

 4. Rays yellow; squamellae of the pappus equal, short, very blunt, opaque, 



sometimes wanting 4. E. wallacei. 



4. Rays white or rosy; squamellae or paleae of the pappus unequal, the 

 longer ones nearly as long as the corolla, lanceolate, acuminate or 

 awned, not opaque 5. E. lanostjm. 



*1. Eriophyllum confertiflorum (DC.) A. Gray, Amer. Acad. Arts and 

 Sci. Proc. 19: 25. 1883. 



Bahia conjertiflora DC, Prodr. 5: 657. 1836. 



Dry hills, central California to Baja California and northern 

 Mexico (reported from Arizona) , April to September. 



Eriophyllum confertiflorum is a variable species, divided into several 

 by Rydberg, who uses the name E. tenuifolium (DC.) Rydb. for the 

 form he records from Arizona. 97 



*2. Eriophyllum multicaule (DC.) A. Gray, Amer. Acad. Arts and Sci* 

 Proc. 19: 24. 1883. 



Actinolepis multicaulis DC, Prodr. 5: 656. 1836. 



Sandy soil, southern California and southern Arizona (east to 

 Tucson, according to Gray 98 ), March to June. 



96 Reference: Constance, Lincoln, a systematic study of the genus eriophyllum lag. Calif. 



Univ. Pub. Bot. 18: 69-135. 1937. 



97 Rydberg, P. A. north American flora. 34: 1915. (See p. 96.) 



9S Gray, Asa. synoptical flora of north America. I 2 : 1884. (Seep. 328.) 



