238 CARDUACEAE 



23. TONESTUS A. Nels. 



Basal leaves oblanceolate, spatulate, or oblong; bracts lanceolate or oblanceolatc. 

 Bracts acute; plants glandular or viscid. 



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



1. T. laceratus. 

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



2. T. Lynllii. 

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



Leaves and bracts linear. 4. T. linearis. 



24. OREOCHRYSUM Rj^db. Mountain Gold. l. o. Parryi. 



25. SOLIDAGO L. Goldenrod. 



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. Virg.\-.\ure.\e. 



Leaves not cihate at the base. IV. Gl.vberrixl^e. 



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. HtTMILES. 



Leaves all entire: stem very leafy, 4-S dm. high. III. Specios.\e. 

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

 (except usually in Nos. 9 and 11 1 . 

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



or linear. IV. Glaberrimae 

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



Stem-leaves lanceolate. V. Serotinae. 



Stem-leaves obovate. VI. Radul.^.S. 

 Leaves densely canescent. 

 Bracts not squarrose. 



Lea\e.s lanceolate; bracts narrowly linear-lanceolate. V. Serotinae. 



Leaves, at least the lower ones, oblanceolate or obovate. VII. Incwnae. 



Bracts squari'ose; leaves numerous, entire, elUpdc. VIII. Wardl\nae. 



I. VraG.\-AUREAE. 



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



or a few corymbose heads. 

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



flowers and pappus; plant 2-3 dm. liigh. 1. S. scnpulorum. 



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, 3-4 dm. high; inflorescence paniculate, but narrow; branches racemiform: 



heads 7-9 mm. liigh. 

 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. HUMILES. 



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. G. S. oreophila. 

 Leaves ciUate at the base; bracts hnear; inflorescence open. 7. S. dilatata. 



III. Spectos.\e. 

 One species. 8. S. pallida. 



IV. Glaberrimae. 

 Heads less than 5 mm. high; stem slender. 



Inflorescence decidedly viscid; leaves indistinctly triple-veined. 9. S. viscidula. 

 Inflorescence not viscid: leaves distinctly triple- veined. 



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



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

 Inflorescence narrow, scarcely secund; bracts hnear-lanceolate. 



11. S. missouriensi^. 

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



12. S. glabcrrima. 

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



V. Serotinae. 

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



secund. 14. S. elongala. 



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 inflore.scence: 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. 



