Spring Flora of Oklahoma 
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bracts with green tips, in several series, receptacle naked. 
Achenes obtuse, compressed, 8-10 nerved. Persistent 
pappus of 1 or more series of unequal, smooth or barbel- 
late bristle. 
1. Sideranthiis spinulosus (Nutt.) Sweet. Cut-leaved Sider- 
anthus. Perennial by thick, woody roots, canescent or glabrate, 
much branched, G'-15' high. Leaves pinnatifid, sessile, linear to 
ovate in outline, the lobes with bristle-pointed teeth. Heads several 
or numerous, G"-12" broad. Involucre hemispheric, its bracts linear, 
acute, appressed. Rays narrow. Achenes pubescent. Pappus soft 
and capillary. 
In dry soil. March-September. Kingfisher County. 
II. APHANOSTEPHUS DC. 
Slender, low, annuals or perennials, much branched, with 
entire to pinnatifid leaves, and pedunculate white-rayed 
heads. Bracts broadly lanceolate, well imbricated, recep¬ 
tacle conic or hemispheric. Achenes terete, truncate, 
with low, laciniate or ciliate pappus. 
1. Aphanostephus skirrobasis (DC.) Trelease. Apitanostepitus. 
Erect, or diffusely branched, densely canescent, G'-24' high. Basal 
and lower leaves spatulate, somewhat dentate, laciniate or entire, 
narrowed into margined petioles. Upper leaves lanceolate to oblong, 
mostly sessile. Heads 8"-12" broad, 3"-5" high. Rays numerous, 
narrow, entire. Achenes ribbed and angled. Pappus a lobed or 
dentate crown. 
In dry soil. May-August. 
III. BELLIS (Tourn.) L. 
Tufted herbs, with branching or scapose stems. Leaves 
alternate or basal. Heads of both tubular and radiate 
flowers. Involucre hemispheric, bracts herbaceous, imbri¬ 
cated in 1 or 2 series* Receptacle convex or conic, naked. 
Ray flowers white or pink, pistillate. Disk-flowers yellow, 
perfect, tubular, 4-5 toothed. Achenes flattened, obovate, 
nerved near the margins. Pappus none, or a ring of minute 
bristles. 
1. Beilis intergrifolia Michx. Western Daisy. Diffusely 
branched, pubescent, G'-15' high. Leaves entire, the lower and basal 
ones spatulate, P-3' long, narrowed into margined petioles, the upper 
