Relationships of initial capsule diameter and leaf area in cotton (Gossypium hirsutum L.) boll parameters were studied under field conditions in 1993 and 1994. Eight germplasm lines were categorized into three groups (based on fuzz and lint density), and two commercial cultivars (Deltapine 50 and Deltapine 90) were included for comparison. The glabrous-seeded and low-linted genotypes produced the lowest leaf area, boll weight, and lint per boll. Genotypes with partial fuzz and moderate lint averaged highest in capsule diameter (12.3 mm), and boll weight (7.0 g), but they were intermediate in leaf area. Genotypes with dense fuzz and high lint fraction produced the largest leaf area (120 cm²) and were intermediate in capsule diameter. The commercial cultivars produced the highest lint fraction even though they had less than the overall mean leaf area, capsule diameter, and boll weight. Comparing nodal positions, higher leaf area occurred in the middle part of the plant. Leaf area was positively related to boll, seed and bur weights, and lint per boll. Initial capsule diameter was significantly and positively correlated with boll, seed, and bur weights, but negatively associated with lint fraction and to a lesser degree with lint per boll. The two commercial cultivars were more agronomicaly efficient than the germplasm lines. The relative boll size and lint fraction of some germplasm lines having partial fuzz indicate a potential to develop these into economic cultivars.