412 RYDBERG: SOME SENECIOID GENERA—II 
Petioles of the basal leaves not winged, pappus 
about equaling the corolla-tube. 
Basal leaf-blades decidedly longer than 
broad, their lobes as long as broad 
Basal leaves more or less lobed 
Leaves decidedly pubescent beneath. 
Lobes of the basal leaves with a 
few large teeth; leaves tomentose ; 
beneath; achenes pubescent...... 13. O. ampullaceum. 
Lobes of the basal leaves with many 
small teeth; leaves villous beneath; 
achenes glabrous. .............. 14. O. amplifolium. 
Leaves glabrous, except on the veins 
“beneath; achenes glabrous......... 15. O. rumictfolium. 
Basal leaves merely dentate, not lobed. 
Basal leaf-blades deeply cordate at the 
base, eee sinuate-dentate; 
corollas 9 mm. long............ 16. O. silphiifolium. 
Basal leaf-blades shallow cordate at 
the git denticulate; corollas 7-8 
mm. 
Leaves baa and shining, thin. 17. O. Goldsmithii. 
Leaves scabrous-puberulent, dull, 
ck, strongly reticulate........ 18. O. scabrum, 
Basal leaf-blades about as broad as long or 
broader, merely sinuately lobed, i. e., 
the lobes much broader than long. 
Involucre 12-13 mm. high, nearly 2 cm. 
broad; leaves of the inflorescence foli- A 
aceous, oblong to ovate; flowers 
or more; bracts 15-20 broadly _— 19. O. amplum. 
Involucre 5-10 mm. high, 4-1 
broad; leaves of the Fi ted 
linear to filiform. 
Heads 20-30-flowered; involucre 10 
mm, high and 15 mm. broad; 
Drache S124). 6 caece cc. 20. O. pachyphyllum. 
p-ha 
distinctly but shallowly lobed tod 
doubly dentate; pappus half as 
long as the corolla.............. 21. O. Palmeri, 
peo sinuate and pa sees 
appus equalling thecorolla...... 22.0. nephrophyllum 
Plant = et 4 dm. high; leaf-blades less than 
6 cm. long; the heads in dense head-like 
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