University of Arkansas Herbarium
Biota of North America Program
Texas A&M University Bioinformatics Working Group
Arkansas Biodiversity - Vascular Plants
from An Annotated Checklist of the Vascular Plants of Arkansas(1988):

 Table 2. Total taxa known by county, from best-collected to worst-collected county; tied counties are listed alphabetically. (added here: a county locator map[select county] and a complete county checklist[all taxa - select number of taxa here or link from the county locator map])
 
 

Rank Order  Arkansas County  Number of Taxa 
1. Washington 1,301
2. Pulaski 1,140
3. Benton  1,125
4. Franklin  1,072
5. Faulkner  1,044
6. Ashley  1,043
7. Pope  1,010
8. Jefferson  971
9. Bradley  964
10. Stone  955
11. Garland  945
12. Newton  938
13. Drew  925
14. Polk  902
15. Logan  892
16. Marion  853
17. Independence  831
18. Baxter  828
19. Conway  828
20. Carroll  824
21. Hempstead  818
22. Cleburne  797
23. St. Francis  774
24. Saline  767
25. Montgomery  762
26. Union  752
27. Hot Spring  750
28. Clark  738
29. Madison  736
30. Craighead  709
31. Arkansas  686
32. Izard  682
33. Yell  643
34. Johnson  613
35. Howard  612
36. Nevada  608
37. Crawford  607
38. Fulton  602
39. Randolph  583
40. Lawrence  577
41. Sebastian  564
42. Clay  563
43. Sharp  561
44. Boone  550
45. Lincoln  550
46. Little River  544
47. Miller  544
48. Searcy  542
49. Ouachita  519
50. Crittenden  516
51. Lee  510
52. Sevier 497
53. Pike 495
54. Greene 488
55. Grant 487
56. Perry 486
57. Prairie 484
58. White  484
59. Poinsett  482
60. Cleveland  478
61. Scott  478
62. Calhoun  461
63. Lonoke  459
64. Dallas  450
65. Van Buren  443
66. Columbia  421
67. Desha  420
68. Cross  417
69. Phillips  401
70. Mississippi  380
71. Chicot  370
72. Monroe  352
73. Lafayette  334
74. Woodruff  298
75. Jackson  275
Total 49,510
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