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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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