[Vor. 3 
86 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
a. Stem-leaves .5 to 3 em. broad, usually 
with “. сие, divisions and 
narrow sinuses. 
I. Heads pm 
1. Lower leaves obovate......... 48a. S. obovatus var. 
elongatus 
2. Lower leaves ovate.......... 35. 8. pauciflorus 
IL. Heads radiate ..4.25- rr 85a. 8. pauciflorus 
var. fallax 
В. Stem-leaves 1 to 6 em. broad with re- 
mote divisions and deep rounded 
TTT EE E 6. 8. idahoensis 
с. Plants 1 to : bor high; leaves thickish in 
texture, the er egi crenate to un- 
equally lobate. Kafe ek 37. S. debilis 
B. Stems erect or ascending, 5 to 4 dm. high, simple 
or branched; heads dréie usually solitary; 
achenes glabrous or hirtellous. 
8. 2. mostly irregularly lobed ог sub- 
lyra 
а. green BIDEN Au SEENEN 38. S. hi ангина 
enes glabrous .................. 39. S. resedifoli 
b. Leaves mostly or all undivided. 
ves thickish in rang ; heads 8 
I. Plants glabrous or nearly so..... 40. 8. ovinus 
11. erg white-tomentose at the base 
and in the leaf-axils. 
1. Heads 12 to Bm high; in- 
volueral braets 21 .......... 41. 8, conterminus 
2. Heads 8 to 10 mm. high; in- 
volueral bracts 13 .......... 42. 8. hesperius 
В. ш thin in texture; heads 8 to 12 
m. high, 
ES Plants of northern United States 
and Canada. 
1. iks leaves coarsely dentate. 43. 8. Newcombei 
2. Lower leaves crenate-dentate. 44. 8. subnudus 
II. Plants of Мехісо............... 46. 8. Rosei 
Y. Leaves reniform to  oblong-obovate, 
thickish in texture; heads 14 to 20 mm. 
igh. 
I. Leaves reniform ............... 46. 8. Porter, 
II. Leaves  subrotund to oblong- 
ПЪОМОЦОС oce EE 47. 8. Soldanella 
C. Stems usually erect, e to 7 dm. high E or 
branched; 
nch heads eommonly sev any, 
usually radiate (discoid іп 8. oe А” уат. 
elongatus, 8 . rubricaulis var. aphanactis and 
rarely in 8. pauperculus). 
