General Key to the Families ' 41 



II. SOLIDAGO. L. 



1. S. canadensis. L. Canada Golden-rod. 



2. S. decumbens. Greene. Field Golden-rod. 



3. S. multiradiata. Gray. Northern Golden-rod. 



4. S. missouriensis. Nutt. Mountain Golden-rod. 



5. S. nemoralis. Ait. Gray Golden-rod. 



6. S. elongata. Nutt. Slender Golden-rod. 



III. ASTER. (Tourn.) L. 



1. A. commutatus. (T. and G.) Gray. White Aster. 



2. A. alpinus. Alpine Aster. 



3. A. conspicuous. Lindl. Large Purple Aster. 



4. A. Fremonti. (T. and G.) Gray. Fremont's Aster. 



5. A. frondeus. (Gray.) Greene. Leafy-bracted As- 



ter. 



6. A. Engelmanni. Englemann's Aster. 



7. A. Lindleyanus. T. and G. Lindley's Aster. 



8. A. laevis. L. Smooth Aster. 



9. A. Richardsonii. Spreng. Richardson's Aster. 



10. A. major. (Hook.) Porter. Great Northern Aster. 



11. A. ciliomarginatus. Rydb. Hairy-margined Aster. 



12. A. sibiricus. Violet Aster. 



IV. ERIGERON. L. 



1. E. aureus. Greene. Yellow Fleabane. 



2. E. compositus. Pursh. Fern-leaved Fleabane. 



3. E. multifidus. Rydb. Daisy Fleabane. 



4. E. melanocephalus. Nelson. Black-woolly Fleabane. 



5. E. csespitosus. Nutt. Tufted Fleabane. 



6. E. glabellus. Nutt. Rough Fleabane. 



7. E. acris. L. Blue Fleabane. 



8. E. philadelphicus. L. Lavender Fleabane. 



9. E. uniflorus. L. Arctic Fleabane. 



10. E. lanatus. Hook. Alpine Fleabane. 



11. E. salsuginosus. (Richards.) Gray. Large Purple 



Fleabane. 



TRIBE 







V. ANTENNARIA. Gaertn. 



i, A. racemosa. Hook. White Everlasting. 



