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Herbarium Specimens Collection
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 Image: Basionym: Genus Basionym: Notes:
1. Zygadenus porrifolius Greene Zygadenus porrifolius Greene
2. Zygadenus porrifolius Greene Zygadenus porrifolius Greene
3. Zygadenus longus Greene Zygadenus longus Greene
4. Ziziphus zonulatus Blco. var. mollis Merr. Ziziphus zonulatus Blco. var. mollis Merr.
5. Zizia aptera (Gray) Fern. var. occidentalis Fernald Zizia aptera (Gray) Fern. var. occidentalis Fernald one specimen image; one type description (pdf).
6. Zizania texana Hitchc. Zizania texana Hitchc.
7. Zizania texana Hitchc. Zizania texana Hitchc.
8. Xyris stricta Chapman var. obscura Kral Xyris stricta Chapman var. obscura Kral
9. Xyris stricta Chapman var. obscura Kral Xyris stricta Chapman var. obscura Kral
10. Xylophacos lagopinus Rydberg Xylophacos lagopinus Rydberg one specimen image; one type description (pdf)
11. Xylophacos lagopinus Rydb. Xylophacos lagopinus Rydb. one specimen image; one type description (pdf)
12. Xanthium varians Greene Xanthium varians Greene
13. Xanthium affine Greene Xanthium affine Greene
14. Wyethia lanceolata Howell Wyethia lanceolata Howell
15. Wyethia amplexicaulis Nutt. ssp. major Piper Wyethia amplexicaulis Nutt. ssp. major Piper
16. Wyethia amplexicaulis (Nutt.) Nutt. ssp. major Piper Wyethia amplexicaulis (Nutt.) Nutt. ssp. major Piper
17. Washingtonia leibergii Coult. & Rose Washingtonia leibergii Coult. & Rose one specimen image; one type description (pdf)
18. Viola verbascula Greene Viola verbascula Greene
19. Viola tomentosa M.S. Baker & J.C. Clausen Viola tomentosa M.S. Baker & J.C. Clausen
20. Viola tomentosa Baker & Clausen Viola tomentosa Baker & Clausen
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