1018 CICHORIACEAE 



heads 10-20-flo\vcrcd, terminating leafy branches; involucres fully 1 cm. high; 

 bracts 8-10; achenes smooth; pappus-bristles naked at the base, sordid. Stephan- 

 omcria Parryi A. Gray. Desert regions: s Utah — Ariz. — Calif. Son, My-Je. 



2. P. tenuifolia (Torr.) Raf. Stem slender, much branched, with ascending 

 branches; leaves narrowly linear, usually entire; involucres about 7 mm. high, 

 about 5-flowered; bracts usually 5, linear, obtuse; achenes smooth or shghtly 

 rugose; pappus white; bristles plumose to the base. S. minor Nutt. Plains: 

 Mont. — Colo. — Ariz. — Wash. Son. — Plain, Je-S. 



3. P. ramosa Rydb. Stem branched at the base, with more or less spread- 

 ing brunches, striate, puberulent below, 2-3 dm. high; lower leaves lanceolate, 

 runcinate-divided ; tipper leaves linear and entire; involucres 8-10 mm. high, 

 usually 5-flowered; bracts proper usually 5, lance-linear, usually acutish; achenes 

 strongly rugose; paj^pus white, plumose to the base. (?) S. runcinaia Nutt, 

 Dry hills: Neb. — Colo. — Mont. Plain — SubmonL Je-S. 



4. P. pauciflora (Torr.) Raf. Stem 2-4 dm. high, with stiff ascending 

 branches; leaves linear or nearly so, the lower runcinate-pinnatifid with narrow 

 divisions, the upper entire; involucres 9-10 mm. high; bracts about 5, linear, 

 obtuse; achenes rugose; pappus tawny; bristles naked at the base. (?) S. runcinaia 

 Nutt. Dry plains: Kans. — Tex. — Ariz.^Nev. Son, Je-S. 



5. P. mjrrioclada (D. C. Eat.) Greene. Stem 3-5 dm. high, slender, more 

 or less flexuose, with numerous branches; leaves linear-filiform, 1-4 cm. long; 

 heads on short lateral branches; bracts 3-5, narrow, 5-6 mm. long; achenes stri- 

 ate; pappus white, merely hirsutulous at the base. S. myrioclada D. C. Eat. 

 Drj^ hills and slopes: Nev. — Ida. Son. Je-S. 



6. P. virgata (Benth.) Greene. Stem 3-10 dm. high, ridged; lower leaves 

 oblong or spatulate, sinuate or pinnatifid, 2-A: cm. long; upper leaves hnear, 

 very small, efttire; heads 6-8 mm. high, subsessile; bracts 5-7, linear; flowers 

 4—10; achenes rugose-tuberculate; pappus-bristles moderately plumose. jS, vir- 

 gata Benth. Arid regions: Ore. — Colo. — Calif. Son, Je-0. 



7. P, paniculata (Nutt.) Greene. Stem erect, 3-6 dm. high; lower leaves 

 oblancoolato or spatulate, toothed, the upper linear, entire, much reduced; pan- 

 icles with racemiform or spicate branches; bracts mostly 5, linear, 5-7 mm. long; 

 achenes more or less rugose. *S. paniculata Nutt. Plains: Wash. — Ida. — Calif. 

 Son, Jl-0. 



8. P. exigua (Nutt.) Greene. Annual; stem 3-6 dm. high, diffusely branched; 

 lower leaves pinnatifid, with lanceolate or linear divisions, those of the branches 

 diminutive and scale-hke; heads paniculate, ending short scaly branches; calycu- 

 late bracts ovate, 1-1.5 mm. long; bracts proper mostly 5, linear, obtuse, 6-7 mm. 

 long; flowers 3-8, mostly 5; achenes thick-ribbed, rugose-tuberculate. *S. exigua 

 Nutt. Dry places: Wyo.— N.M. — Calif.— Nev. Son, 



4. NEMOSERIS Greene. Desert Chicory. 



Stout branchmg winter annuals, with somewhat fistulose stems and toothed 

 or pinnatifid leaves. Heads lo-30-flowered. Involucres turbinate-cylindric; 

 bracts 7-15, linear, acuminate, equal, in a single series, with a few small calycu- 

 late ones at the base. Flowers white or tinged with rose-color. Achenes terete, 

 with obscure ribs, produced into a beak at the summit, callous at the base, witii 

 a hollowed insertion. Pappus of 10-15 capillary plmnose bristles. [Rafinesquia 

 Nutt.] 



Ligules 10-15 mm. long; beak of the achenes much shorter than the body. 



1. N. neomezicana. 



Ligules about 5 mm. long; beak of the achenes as long as the body. 2. N. californica. 



1. N. neomexicana (A. Gray) Greene. Stem 2-5 dm. high; leaves lanceo- 

 late, rimcinate-pinnatifid, with narrow divisions; heads few, paniculate; bracts 

 10-12, linear-lanceolate, 15-18 mm. long; ligules white, tinged with flesh-color; 

 achenes gradually tapering into the short beak. R. neomexicana A. Gray. Sand- 

 hills: N.M.— ^ Utah— se Calif., L. Son. Mr-My. 



