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| Descriptor | Description | Period of collection |
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| Vine per plant | Counting of the number of vines on each plant | 16 weeks after planting |
| Spine on sprout | 0 = absent and 1 = present |
| Vine colour | 1 = green, 2 = purplish green, 3 = brownish green, 4 = dark brown, and 5 = purple |
| Spines on vine | 0 = absent, 1 = few, and 2 = many |
| Leaf position | 1 = alternate, 2 = opposite, and 3 = alternate at base/opposite above |
| Leaf width | Measured (cm) |
| Leaf length | Measured (cm) |
| Leaf area | Calculated (cm) |
| Leaf shape | 1 = ovate, 3 = cordate, 5 = sagittate, and 7 = hastate |
| Leaf density | 3 = low, 5 = intermediate, and 7 = high |
| Petiole length | Measured (cm) |
| Plant vigour | 1 = weak, 2 = medium, and 3 = vigorous |
| Petiole colour | 3 = light green, 5 = dark green, 7 = green purple, 8 = red, and 9 = purple |
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| Sex of flower | 0 = non flowering, 1 = male flowers, 2 = female flower, 3 = monoecious male (predominantly male), and 4 = monoecious female (predominantly female) | Two weeks after flowering |
| Flower intensity | 0 = no flower, 1 = aborted flower, 3 = low, 5 = moderate, 7 = profuse, and 9 = extremely profuse |
| Days to flowering | Counting in days (first observation of flower) |
| Flower length | The length of the flower (cm) |
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| Yam anthracnose disease | 1 = no visible symptoms, 2 = few on leaves, 3 = mild symptoms, 4 = severe symptoms, and 5 = severe leaf distortion and stunting | Monthly (8 weeks after planting) |
| Yam virus disease | 1 = no visible symptoms, 2 = mosaic on most leaves, 3 = mild symptoms, 4 = severe mosaic, and 5 = severe leaf distortion and stunting |
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| Tuber weight | Calculated per plot | Between 1 and 14 days after harvesting |
| Tuber number | Counted per plot |
| Tuber circumference | The average circumference length of 3 tubers per plot in cm |
| Tuber surface texture | 1 = smooth and 2 = rough |
| Tuber branching | 0. no branching, 3. Slightly branching, 5. Branched, and 7. Highly branched |
| Tuber length | The average length of 3 tubers per plot in cm |
| Tuber shape | 1 = spherical/round, 2 = oval, 3 = cylindrical, and 4 = irregular |
| Tuber size | 1 = small (less than 15 cm length, 2 = medium (between 15 and 25 cm length), and 3 = big (more than 25 cm length) |
| Dry matter content | Calculated using the oven method |
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