Solidago 



Compositae 



921 



Solidago canadensis L 



50 



Map 2012 



Solidago canadensis 

 van gilvocanescens Rydb. 



Gillmani (Gray) Steele of Indiana authors.) Gillman Goldenrod. Map 

 2010. An infrequent goldenrod on open dunes bordering Lake Michigan. 

 At present it is common on the dunes just east of the Dunes State Park, 

 Porter County. 



Authors write that the stems are glabrous to the inflorescence. My 

 specimens are all more or less or have been, densely appressed-pubescent. 

 The abrasive force of moving sand, however, has detached the hairs from 

 the stems of some of my specimens so that to a casual observer they appear 

 glabrous. Close inspection, however, will usually show many hairs on 

 protected parts of the stem and the many hair scars prove that the plants 

 were pubescent. The glabrate specimens match those grown in places pro- 

 tected from shifting sand. This species is highly variable in all parts and 

 it is possible that the preceding species should be included in it. In 1937 I 

 made a special effort to collect this species in large series. In so doing I 

 found the roots of a few plants infested with aphids. In my collection of 

 former years, I have several sheets with small heads and with many unde- 

 veloped flowers. Might it not be that at least some of the variation in these 

 plants is nutritional and due to badly infested roots? The plants found 

 this year that were infested were normal but the aerial effect of aphids on 

 cultivated asters is well known. 



Dunes and rocks on the borders of the Great Lakes. 



10. Solidago canadensis L. Canada Goldenrod. Map 2011. My Steuben 

 County specimen is the only one I have that I regard as typical. The 

 remainder are atypical forms that are nearer the typical form than the 

 variety. My Steuben County specimen is from the mucky border of a lake 

 and the remainder are from dry slopes. 



Newf. to N. Dak., south w. to Va. and Ky. 



10a. Solidago canadensis var. gilvocanescens Rydb. Map 2012. This 

 form is found in various habitats ranging from alluvial banks, open woods, 



