280 ASTER FAMILY 



b. Leaves mostly alternate, only the lower oppo- 

 site 



(1) Leaves linear or lance-linear; perennial H. orgydlis 



(2) Leaves ovate; annual 



(a) Leaves entire or nearly so; bracts of the 



involucre lanceolate, gray-hairy H. petioldris 



(b) Leaves toothed; bracts oblong to ovate, 



long-pointed, hairy and ciliate H. dnnuus 



2. Disk yellow 



a. Leaves opposite; stems rough and bristly, 1-3 



ft. high H. pumilus 



b. Some of the upper leaves alternate 



(1) Stem leaves rough and somewhat hairy H. Maximilian i 



(2) Stem smooth, often glaucous 



(a) Leaves mostly sharply toothed, hairy 



beneath H. grosse-serrdtus 



(b) Leaves entire or finely toothed, not hairy 



beneath H. Nuttdllii 



Heliopsis Persoon 1807 Ox-eye 

 (Gr., Jielios, sun, ops-is, likeness) 



Heads with yellow pistillate ray-flowers, rays persisting, disk-flowers 

 yellow, perfect, achenes 3-4-angled, pappus a short, toothed crown, or of 1-3 

 awns ; receptacle convex to conic, with chaff, involucre hemispheric, the 

 bracts imbricated in 2-3 rows ; heads solitary, terminal and axillary ; leaves 

 opposite, simple, perennial. 

 Stems 2-5 ft. high ; leaves ovate or lance-ovate, toothed, 



2-5 in. long; rays an inch long or more H.scdbra 



Hieracium Linne 1753 Hawk weed 

 (Gr. hie rax, hawk) 



Heads with yellow, orange or red' perfect strap-flowers, achenes ob- 

 long to cylindric, not beaked, 10-15-ribbed, round or 4-5-angled, pappus 

 of brown or brownish hair-like bristles ; receptacle flat, without chaff, in- 

 volucre bell-shaped to cylindric, the bracts in 1-3 rows, often with smaller 

 basal ones ; heads solitary or in corymbs or panicles ; leaves alternate or 

 basal, entire to toothed or lobed ; perennial. 



1. Bracts of the involucre in 2-4 rows; stems leafy 



a. Leaves, at least the upper, clasping; involucre 



hairy H. canadcnse 



b. Leaves not clasping; involucre smooth H.umbelldtum 



