Frank H. Knowlton

18 public-domain plates in the archive

• Polygonum douglasii subsp. austiniae (S.W. Greene) A.E. Murray 1887
• Penstemon pseudoprocerus Rydb. 9 Aug 1887
• Collomia linearis Nutt. 1887
• Heterotheca villosa (Pursh) Shinners 1887
• Solidago canadensis var. salebrosa (Piper) M.E. Jones 1887
• Arnica latifolia Bong. 18 Aug 1887
• Vaccinium scoparium Leiberg ex Coville 18
• Artemisia graveolens Rydb. 18
• Eriophyllum integrifolium (Hook.) Greene 1887
• Eremogone congesta (Nutt.) Ikonn. var. congesta Aug 1887
• Eremogone congesta (Nutt.) Ikonn. var. congesta Aug 1887
• Eremogone congesta (Nutt.) Ikonn. var. congesta 15 Aug 1887
• Cerastium arvense L. 8 Aug 1887
• Pyrola chlorantha Schweigg. 10 Aug 1887
• Drymocallis glandulosa (Lindl.) Rydb. 9 Aug 1887
• Vaccinium scoparium Leiberg ex Coville 15 Aug 1888
• Apocynum vacillans Greene 25 Jul 1888
• Gentiana forwoodii A. Gray 11 Aug 1887