\ \ p 
Vol. XXVII, pp. 5-8 
February 2, 1914 
PPxOCEEDINGS 
OK TllK 
BIOLOGICAL SOCIETY OF WASHINGTON 
A NPW ITELIANTITUS FROiM COLORADO. 
I‘.Y T. 1). A. CdCKlOIKLL. 
In the vicinity of Boulder, Colorado, the species of perennial 
sunflowers are coninion, Helianthus piiiiiikis Nutt, abounds in 
the foothill region, in rather dry, rocky jdaces. IT. suhrhow- 
holiJcus Rydberg I have found l)y roadsides east of Boulder, 
moderately common. The third species is a tall plant common 
on ditch hanks and by streams everywhere on the adjacent 
plains. Daniels, in his Flora of Boulder, Colorado, and 
vicinity (Bill) calls this third species IL r/rosseserratas ]\Iartens, 
hut also cites IT. fascicularis Greene from Boulder, crediting the 
record to Rydberg. In his Flora of Colorado (BlOh) Rydheig 
gives a single record of II. grosscservdlus from kort Collins, hut 
cites II. fascicular is from Fort Collins, Boulder, and other locali¬ 
ties. According to the characters given in the key (Rydberg, 
I. c. p. 373), our plant is fascicidaris and not grosseserratas. 
The original II. fascicular is was described by Greene from 
Cimarron (Greene) and Gunnison (BakeiO- It is a ])lant 
of the Colorado mountain region, api)arently quite distinct from 
that of the plains. Doctor Rydberg, however, believes that the 
two rein-esent forms of a single species. I sent him a manu- 
scri])t descri] 3 tion of our Boulder plantand he kindly leplied (lift. 
October 7, 1913): '\IIelianthus f<i.scicularis \\iiS described from 
Colorado, and the type fits your description. It may he that 
II. grosseserratus of Daniels’ Flora is the same. 1 do not 
rememher that II. grosseserratus is found in Colorado. It may 
he that II. fascicularis Greene is not exactly the same as II. 
ulaheusis. I believe that the two represent the extreme forms 
of the same species, II. fascicularis representing the eastern and 
2 —I’KOC. UiOL. Soc. Wash., Voi,. XX\JI, 1914. (*5) 
