250 



Nelson : New Plants from Wyoming 



tinguishcd from Erigcron 



its multiscrial inv^olucrc and the 

 thickened rigid bracts ; by the short, strongly pubescent achenes, 

 which are scarce!}' flattened, and by its uniserial pappus. I had 

 thought to call the genus Hdhria in honor of that indefatigable 

 ■collector, A. A. Heller, but that name being preoccupied I call it 

 Wyoiningia in honor of m)- own state. 



Wyomingia cinerea 



stems erect, fascicled, somewhat 

 striate with yellowish-green lines (possibly a generic distinction), 

 about 2 dm. high, the upper part naked, pedunculate, usually with 

 a single bract : leaves linear or some of the crown leaves spatulate, 

 acute, cinereous (as are also the stems) with a short, close, ap- 

 pressed pubescence : heads large, when fully open, 3 cm. or more 

 across : involucre broadly hemispherical, about i cm. high, its 

 bracts acute, cinereous with a spreading, crinkled pubescence ; rays 

 30 (more or less), 5-7-nerved, white or pinkish, the tube finely 

 pubescent as are also the disk florets, 3 mm. broad, 3 -toothed at 

 the rounded apex : pappus tawny, in a single series, about as long 



Characters of the genus 



as the disk corollas", the bristles mostly abruptly flexed ^ their 

 length below the apex: achcnc short, striately marked with 2-4 

 greenish-yellow lines, densely pubescent : receptacle flat, alveolate. 



A 

 gra\^ell) 



Collected on sterile, 



June 



18, i8g8, no. 4828. Very similar and probably the same as tliis 

 is Professor C. S. Crandall's specimens from Grand Junction, Colo., 

 distributed as Erigcron argcntatus Gray. Type In Herb. Univer- 

 sity of Wyoming. 



