1907.1 NATURAL SCIENCES OF PHILADELPHIA. 247 



NOTES ON THE LEAF HAIRS OF LESQUEKELLA.' 

 BY E. G. YAXATTA. 



The hairs of the leaves of Lfsgucrc//tt are usually described in botani- 

 cal works as "stellate." So far as I know, it has not been noticed that 

 the forms vary in different species. These differences may become an 

 important feature for the determination of the species. The ninnbcr 

 of rays of these stellate hairs is variable, but the form of the rays and 

 their manner of branching are more constant, although some hairs of 

 the compound forms often have one or more raj's simi)le. 



By the shape of the hairs the species of Lesquerclla which 1 have 

 examined fall into five groups as follows: 



Group I. — Hair a simple few-rayed star. 



PL XXI, fig. 1 X 60. L. argyrca Gray. Flora, Texas, Exsic. 329, 

 Fasc. Ill, leg. T. Lindhcimer, 1S46. 



Group II. Hair a few-rayed star, each ray normally bifid. 



PI. XXI, fig. 3 X 60. L. argentea Wats. Laramie University Campus, 



Wyoming. Acad. Nat. Sci. Phila. No. 523,700. 

 Fig. 2 X 60. L. globosa Dr. Rising Sun Bluff, Cimiberland River, 



fourteen miles below Nashville, Tenn. 

 Fig. 4 X 60. L. gracilis Hook. Mesa near Tucson, Arizona. E. 



Pringle, April 12. (B. Smith.) 

 Fig. 5 X 60. L. hidoviciana Wats. Laramie, Wyoming; Flora, 



Wyoming, 190. C. Nelson, 1894. 

 Fig. 8 X 60. L. montona Gray. Table Mountain. Wyoming; Flora, 

 • Wyoming, 88. A. Nelson. 

 Fig. 9 X 60. L. recurvata Engl. Kerrville, Texas. A. Heller, 



1657. 



Group III. Each ray of star normally twice bifid. 

 PI. XXL fig. 10 X 60. L. alpina Wats. New Mexico. A. Fendler, 



1847. 

 Fig. 13 X 60. L. arctica Wats. Itibla, Whale Sound, McCormiek 



Bay, Greenland. A. Heilprin, 1891. 



