References

1) Roger Peterson and Margaret McKenny, A Field Guide to Wildflowers – Northeastern and North-central North America, Peterson Field Guides, 1996

2) Lawrence Newcomb, Wildflower Guide, Little Brown and Company, 1977

3) Dennis Magee and Harry Ahles, Flora of the Northeast, University of Massachusetts Press, 1999

4) Henry Gleason and Arthur Cronquist, Manual of Vascular Plants of Northeastern United States and Adjacent Canada (Second Edition), The New York Botanical Garden, 1991

5) Noel Holmgren, The Illustrated Companion to Gleason and Cronquist’s Manual – Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada, The New York Botanical Garden, 1998

6) Johnny’s Selected Seed flower catalog, for more information visit: www.johnnyseed.com

7) www.floridata.com/ref/T/tithon_r.cfm


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