Solidago Compositae 915 



Basal rosettes conspicuous; blades of rosettes and lower stem leaves 5-15 cm 

 long and 3-7 cm wide, on margined petioles of nearly equal length; upper 

 stem leaves sessile or subsessile; pedicels about 5 mm long; pubescence 



on back of bracts appressed and eglandular or with a few glands 



1, S. squarrosa. 



Basal rosettes usually lacking; blades of the lower stem leaves generally much 

 smaller than the median ones, usually 7-12 cm long and 1-2 cm wide, all 

 sessile or subsessile. 

 Pedicels usually about 2 mm long; pubescence of bracts eglandular. (See 



excluded species no. 617, p. 1096) S. petiolaris. 



Pedicels mostly 5-10 mm long; pubescence of bracts rather dense, short, 



spreading, and glandular 2. S. Buckleyi. 



Bracts of the involucre erect, not squarrose. 

 B. Inflorescence axillary, i. e., in clusters or short racemes from the axils of 

 ordinary leaves. 

 Achenes glabrous or sparsely pubescent at maturity. 



Stems densely pubescent from the base through the inflorescence; pub- 

 escence multicellular, spreading on the lower part of the stem, and 

 on the upper part usually upwardly subappressed; leaves not thick, 

 densely pubescent below and pubescence usually equally as dense 

 above but the hairs shorter; involucres mostly 4.5-5 mm long, 

 glabrous or pubescent; mature achenes 1.5-2.2 mm long, those of the 

 ray flowers generally longer. 



Rays white 3 - S - bicolor. 



Rays yellow 4 - S - hispida. 



Stems glabrous below the inflorescence but the axis of the inflorescence 

 pubescent; leaves thick, glabrous or nearly so both above and below. 



5. S. erecta. 



Achenes densely pubescent. 

 Involucres 3.5-5 mm high. 



Stems glabrous, glaucous, terete, usually more or less branched; leaves 



of a lanceolate type 6 - s - caesia. 



Stems glabrous or somewhat pubescent above but not glaucous, more 

 or less angular and zigzag, rarely branched; leaves usually of a 



broadly ovate type 7 - s - latifoKa. 



Involucres 6-9 mm high; plants found in Indiana only along Lake 

 Michigan. 

 Blades of basal rosette obovate to narrow-obovate, rounded at the apex 

 or some of them acute, on margined petioles about half the length 

 of the blades; inflorescence narrow and compact, spikelike in ap- 

 pearance, less than 5 cm wide; heads mostly in small clusters. .. .. 



8. S. Deamii. 



Blades of the basal rosette oblanceolate, acute, on margined petioles 

 almost as long as the blades; inflorescence usually of a paniculate 

 type, mostly 5-15 cm wide (small specimens may be narrower) ; 

 heads comparatively few, usually racemosely disposed on the 



branchlets, rarely a few heads in a cluster • 



9. S. racemosa var. Gillmani. 



B. Inflorescence not axillary, either racemose, paniculate or corymbose. 

 C. Inflorescence racemose or paniculate. 

 D. Heads secund, i. e., racemes one-sided. 



