VOL XVII, PP. 111-112. MAY 18, 1904. 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NOTES ON TETRANEURIS LINEARIFOLIA, 

 BY T. D. A. COCKERELL. 



Tetraneuris linearifolia (Hooker) Greene. 



This species is certainly very variable, both as to its mode of growth and 

 the width of the leaves. How far these differences are racial it is hard 

 to say. The specimens seen are as follows : 



Tr.i-as. Kerrville, Kerr Co. (Heller); "Texas" (Lindheimer, 267); " On 

 the Pierdenales" (Lindheimer) ; Leona (Wright); " Pecos, etc." (Wright); 

 Brazos (Lindheimer) ; Dallas (Elihu Hall) ; near New Braunfels (Lind 

 heimer) ; Gillespie Co. (G. Jenny) ; Dallas (Reverchon) ; San Antonio 

 (E. H. Wilkinson) ; Dallas (B. F. Bush). The Lindheimer plants have 

 very narrow leaves, and are no doubt typical. The Heller plant from 

 Kerrville (Heller, 1619 ; hb. Mo. Botanical Garden) has larger heads (over 

 25 mm. diam. with rays, and about 12 without), dark olive-green almost 

 entirely glabrous foliage, some of the leaves as much as 5 mm. broad, and 

 strongly striate practically glabrous stems. The involucres and peduncles 

 beneath are covered with ochreous hair. The plant has a spreading bushy 

 growth, and is about 25 cm. high, counting the heads. This plant grows 

 in " rich and often shaded ground " (Heller, Bot. Expl. So. Tex., p. 109), 

 whereas Lindheimer's plant grows " in masses together on sandy prairies, 

 with thin soil " (Lindheimer, 648). Whether the Kerrville plant represents 

 a " form " or a true race, can not be certainly determined at present, but 

 the latter would seem rather probable, or Heller would have found both 

 states. It may be called var. latior (type, Heller's 1619). 



Oklahoma. Huntsville, Kingfisher Co. (Laura A. Blankinship). Small 

 plants; lowest leaves broad. 



Kansas. Sumner Co. (Mark White). Bushy ; leaves narrow. 



15 PHOC. Bioi,. Soc. WASH. VOL. XVII, 1904. (Ill) 



