Fisher's Iris Dataset — Sepal & Petal Measurements for 3 Species
150 iris flowers measured by sepal and petal length/width across Setosa, Versicolor, and Virginica species.
| # | sepal.length | sepal.width | petal.length | petal.width | variety | + |
|---|---|---|---|---|---|---|
| 1 | 5.1 | 3.5 | 1.4 | .2 | Setosa | |
| 2 | 4.9 | 3 | 1.4 | .2 | Setosa | |
| 3 | 4.7 | 3.2 | 1.3 | .2 | Setosa | |
| 4 | 4.6 | 3.1 | 1.5 | .2 | Setosa | |
| 5 | 5 | 3.6 | 1.4 | .2 | Setosa | |
| 6 | 5.4 | 3.9 | 1.7 | .4 | Setosa | |
| 7 | 4.6 | 3.4 | 1.4 | .3 | Setosa | |
| 8 | 5 | 3.4 | 1.5 | .2 | Setosa | |
| 9 | 4.4 | 2.9 | 1.4 | .2 | Setosa | |
| 10 | 4.9 | 3.1 | 1.5 | .1 | Setosa | |
| 11 | 5.4 | 3.7 | 1.5 | .2 | Setosa | |
| 12 | 4.8 | 3.4 | 1.6 | .2 | Setosa | |
| 13 | 4.8 | 3 | 1.4 | .1 | Setosa | |
| 14 | 4.3 | 3 | 1.1 | .1 | Setosa | |
| 15 | 5.8 | 4 | 1.2 | .2 | Setosa | |
| 16 | 5.7 | 4.4 | 1.5 | .4 | Setosa | |
| 17 | 5.4 | 3.9 | 1.3 | .4 | Setosa | |
| 18 | 5.1 | 3.5 | 1.4 | .3 | Setosa | |
| 19 | 5.7 | 3.8 | 1.7 | .3 | Setosa | |
| 20 | 5.1 | 3.8 | 1.5 | .3 | Setosa | |
| 21 | 5.4 | 3.4 | 1.7 | .2 | Setosa | |
| 22 | 5.1 | 3.7 | 1.5 | .4 | Setosa | |
| 23 | 4.6 | 3.6 | 1 | .2 | Setosa | |
| 24 | 5.1 | 3.3 | 1.7 | .5 | Setosa | |
| 25 | 4.8 | 3.4 | 1.9 | .2 | Setosa | |
| 26 | 5 | 3 | 1.6 | .2 | Setosa | |
| 27 | 5 | 3.4 | 1.6 | .4 | Setosa | |
| 28 | 5.2 | 3.5 | 1.5 | .2 | Setosa | |
| 29 | 5.2 | 3.4 | 1.4 | .2 | Setosa | |
| 30 | 4.7 | 3.2 | 1.6 | .2 | Setosa | |
| 31 | 4.8 | 3.1 | 1.6 | .2 | Setosa | |
| 32 | 5.4 | 3.4 | 1.5 | .4 | Setosa | |
| 33 | 5.2 | 4.1 | 1.5 | .1 | Setosa | |
| 34 | 5.5 | 4.2 | 1.4 | .2 | Setosa | |
| 35 | 4.9 | 3.1 | 1.5 | .2 | Setosa | |
| 36 | 5 | 3.2 | 1.2 | .2 | Setosa | |
| 37 | 5.5 | 3.5 | 1.3 | .2 | Setosa | |
| 38 | 4.9 | 3.6 | 1.4 | .1 | Setosa | |
| 39 | 4.4 | 3 | 1.3 | .2 | Setosa | |
| 40 | 5.1 | 3.4 | 1.5 | .2 | Setosa | |
| 41 | 5 | 3.5 | 1.3 | .3 | Setosa | |
| 42 | 4.5 | 2.3 | 1.3 | .3 | Setosa | |
| 43 | 4.4 | 3.2 | 1.3 | .2 | Setosa | |
| 44 | 5 | 3.5 | 1.6 | .6 | Setosa | |
| 45 | 5.1 | 3.8 | 1.9 | .4 | Setosa | |
| 46 | 4.8 | 3 | 1.4 | .3 | Setosa | |
| 47 | 5.1 | 3.8 | 1.6 | .2 | Setosa | |
| 48 | 4.6 | 3.2 | 1.4 | .2 | Setosa | |
| 49 | 5.3 | 3.7 | 1.5 | .2 | Setosa | |
| 50 | 5 | 3.3 | 1.4 | .2 | Setosa | |
| 51 | 7 | 3.2 | 4.7 | 1.4 | Versicolor | |
| 52 | 6.4 | 3.2 | 4.5 | 1.5 | Versicolor | |
| 53 | 6.9 | 3.1 | 4.9 | 1.5 | Versicolor | |
| 54 | 5.5 | 2.3 | 4 | 1.3 | Versicolor | |
| 55 | 6.5 | 2.8 | 4.6 | 1.5 | Versicolor | |
| 56 | 5.7 | 2.8 | 4.5 | 1.3 | Versicolor | |
| 57 | 6.3 | 3.3 | 4.7 | 1.6 | Versicolor | |
| 58 | 4.9 | 2.4 | 3.3 | 1 | Versicolor | |
| 59 | 6.6 | 2.9 | 4.6 | 1.3 | Versicolor | |
| 60 | 5.2 | 2.7 | 3.9 | 1.4 | Versicolor | |
| 61 | 5 | 2 | 3.5 | 1 | Versicolor | |
| 62 | 5.9 | 3 | 4.2 | 1.5 | Versicolor | |
| 63 | 6 | 2.2 | 4 | 1 | Versicolor | |
| 64 | 6.1 | 2.9 | 4.7 | 1.4 | Versicolor | |
| 65 | 5.6 | 2.9 | 3.6 | 1.3 | Versicolor | |
| 66 | 6.7 | 3.1 | 4.4 | 1.4 | Versicolor | |
| 67 | 5.6 | 3 | 4.5 | 1.5 | Versicolor | |
| 68 | 5.8 | 2.7 | 4.1 | 1 | Versicolor | |
| 69 | 6.2 | 2.2 | 4.5 | 1.5 | Versicolor | |
| 70 | 5.6 | 2.5 | 3.9 | 1.1 | Versicolor | |
| 71 | 5.9 | 3.2 | 4.8 | 1.8 | Versicolor | |
| 72 | 6.1 | 2.8 | 4 | 1.3 | Versicolor | |
| 73 | 6.3 | 2.5 | 4.9 | 1.5 | Versicolor | |
| 74 | 6.1 | 2.8 | 4.7 | 1.2 | Versicolor | |
| 75 | 6.4 | 2.9 | 4.3 | 1.3 | Versicolor | |
| 76 | 6.6 | 3 | 4.4 | 1.4 | Versicolor | |
| 77 | 6.8 | 2.8 | 4.8 | 1.4 | Versicolor | |
| 78 | 6.7 | 3 | 5 | 1.7 | Versicolor | |
| 79 | 6 | 2.9 | 4.5 | 1.5 | Versicolor | |
| 80 | 5.7 | 2.6 | 3.5 | 1 | Versicolor | |
| 81 | 5.5 | 2.4 | 3.8 | 1.1 | Versicolor | |
| 82 | 5.5 | 2.4 | 3.7 | 1 | Versicolor | |
| 83 | 5.8 | 2.7 | 3.9 | 1.2 | Versicolor | |
| 84 | 6 | 2.7 | 5.1 | 1.6 | Versicolor | |
| 85 | 5.4 | 3 | 4.5 | 1.5 | Versicolor | |
| 86 | 6 | 3.4 | 4.5 | 1.6 | Versicolor | |
| 87 | 6.7 | 3.1 | 4.7 | 1.5 | Versicolor | |
| 88 | 6.3 | 2.3 | 4.4 | 1.3 | Versicolor | |
| 89 | 5.6 | 3 | 4.1 | 1.3 | Versicolor | |
| 90 | 5.5 | 2.5 | 4 | 1.3 | Versicolor | |
| 91 | 5.5 | 2.6 | 4.4 | 1.2 | Versicolor | |
| 92 | 6.1 | 3 | 4.6 | 1.4 | Versicolor | |
| 93 | 5.8 | 2.6 | 4 | 1.2 | Versicolor | |
| 94 | 5 | 2.3 | 3.3 | 1 | Versicolor | |
| 95 | 5.6 | 2.7 | 4.2 | 1.3 | Versicolor | |
| 96 | 5.7 | 3 | 4.2 | 1.2 | Versicolor | |
| 97 | 5.7 | 2.9 | 4.2 | 1.3 | Versicolor | |
| 98 | 6.2 | 2.9 | 4.3 | 1.3 | Versicolor | |
| 99 | 5.1 | 2.5 | 3 | 1.1 | Versicolor | |
| 100 | 5.7 | 2.8 | 4.1 | 1.3 | Versicolor |
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Fisher's Iris Dataset — Sepal & Petal Measurements for 3 Species — AI Analysis
Species Comparison
- Petal length is the strongest species discriminator: Setosa averages 1.46 cm vs Versicolor at 4.26 cm and Virginica at 5.55 cm
- Setosa petal width (0.25 cm) is 5x smaller than Versicolor (1.33 cm) and 8x smaller than Virginica (2.03 cm)
- Sepal measurements are far less diagnostic — Versicolor and Virginica overlap significantly in both sepal length and width
- Setosa has the widest sepals on average (3.43 cm) despite having the smallest flowers overall
Visualizations
Mean Sepal Length by Species
Mean Petal Width by Species
Mean Petal Length by Species
All Measurements by Species
Why Iris Matters
Fisher's 1936 iris dataset is the most cited dataset in pattern recognition. The key insight: petal measurements alone achieve near-perfect species classification, while sepal measurements cannot reliably separate Versicolor from Virginica.