■238 CARDUACEAE 



23. TONESTUS A. Nels. 



Basal leaves oblanceolate, spatulate, or oblong: bracts lanceolate or oblanceolato. 

 Bracts acute; plants glandular or viscid. ' 



Bracts lacerate or cUiate; stem-leaves linear or linear-lanceolate, long-ciliate. 



1. T. laceratus. 

 Bracts neither lacerate nor ciliate; stem-leaves oblanceolate, not ciliate. 



2. T. Lyallii. 

 Bracts obtuse; plant soft-pubescent or glabrate, scarcely viscid. 3. T. pygmaeus. 



Leaves and bracts linear. 4. T. linearis. 



24. OREOCHRYSUM Rydb. Mountain Gold. i. o. Parryi. 



25. SOLIDAGO L. Goldeneod. 



Leaves glabrous or slightly pubescent along the veins and on the margins. 



Leaves not triple- veined; branches of the inflorescence not recurved-spreading : heads 

 not secund. 

 Bracts of the inflorescence lanceolate or linear-lanceolate, acute or acuminate. 

 Leaves ciliate at the base. I. Virga-Auheae. 



Leaves not ciliate at the base. IV. Glabebrimae. 



Bracts of the inflorescence oblong or linear-oblong, obtuse. 



Leaves, at least the basal ones, toothed : stem-leaves few ; plants 1-4 dm. high. 



II. HUMILES. 



Leaves all entire: stem very leafy, 4-.S dm. high. III. Speciosae. 

 Leaves triple- veined ; heads more or less secund, on recurved-spreading branches 

 (except usually in Nos. 9 and 1 1 1 . 

 Plants slender, not very leafy, 2-4 dm. high: stem-leaves narrowly oblanceolate 



or linear. IT. Glaberrimae 

 Plant tall, leafy, 4-10 dm. high. 



Stem-leaves lanceolate. V. Serotinae. 



Stem-leaves obovate. VI. Eadul.*.";. 

 Leaves densely canescent. 

 Bracts not squarrose. 



Lea\es lanceolate: bracts narrowly linear-lanceolate. V. Seeotix.ve. 



Leaves, at least the lower ones, oblanceolate or obovate. VII. Incan-\e. 



Bracts squarrose: leaves numerous, entire, ellipijirr. VIII. Wardian.^e. 



I. VmGA-AURE.\E. 



Plants low and slender, 1-3 dm. high; inflorescence corymbiform; branches with a single 



or a few corymbose heads. 

 Heads 7-9 mm. high; inner bracts linear-lanceolate, of about the same length as the 



flowers and pappus; plant 2-3 dm. high. 1. .3. scopulorum. 



Heads 5-7 mm. high; bracts lanceolate, the inner shorter than the flowers and the 



pappus; plant usually less than 2 dm. high. 2. S. ciliosa. 



Plants stout, 3^ dm. high; inflorescence paniculate, but narrow; branches racemiform: 



heads 7-9 mm. high. 

 Basal leaves broadly oblanceolate, acute; stem pubescent. 3. S. rubra. 



Basal leaves narrowly oblanceolate, obtuse; stem glabrous up to the inflorescence. 



4. S. laevicaulis. 



II. Hdmiles. 

 Plant low, 1-1.5 dm. high; inflorescence with few heads, short, congested. 



5. S. decumbens 

 Plant taller, 2-4 dm. high; inflorescence with many heads, elongate. 



Leaves not cihate; bracts oblong; inflorescence usually narrow. 6. S. oreophila. 

 Leaves ciliate at the base; bracts linear; inflorescence open. 7. S. dilatata. 



III. Speciosae. 

 One species. 8. S. pallida. 



IV. Glaberrimae. 

 Heads less than 5 mm. high; stem slender. 



Inflorescencedecldedly viscid; leaves indistinctly triple- veined. 9. S. viscidula. 

 Inflorescence not viscid ; leaves distinctly triple-veined. 



Plant glaucous; bracts thick, oblong, obtuse. 10. S. glaucophylla. 



Plant not glaucous; bracts not thick, linear-lanceolate to oblong-lanceolate. 

 Inflorescence narrow, scarcely secund; bracts linear-lanceolate. 



11. S. missouriensis. 

 Inflorescence usually open and more or less secund; bracts oblong-lanceolate. 



12. iS. glaberrima. 

 Heads 6-7 mm. high; stem stout. 13. S. concinna. 



V. Serotinae. 

 Inflorescence narrowly rhombic in outline; branches ascending, almost straight, scarcely 



secund. 14. S. elongata. 



Inflorescence broad; branches recurved-spreading, distinctly secund. 



Leaves green, sparingly pubescent or glabrous; pubescence scabrous, mostly confined 

 to the margins and the veins. 

 Stem usually glabrous up to the inflorescence; leaves glabrous except on the margins 

 and on the midveins. 

 Veins of the leaves glabrous ; heads 5-6 mm. high, in a short panicle with strongly 

 curved branches. 15. S. serotina. 



