Land type Description Area in 750-m radius (%) Median floral resources by sampling period (cm3/m2)
Areas not digitized Barren, developed, exposed, water, urban land N/A 0.00
Cereal crop Barley, millet, oats, rye, spelt, triticale, wheat 0.002 –15 0.00
Corn Anecdotal evidence of floral resources provided (but see Roulston et al. 2000) 0.3–38 0.00
Soybean Anecdotal evidence of floral resources provided (but see Erickson et al. 1978, Ahrent and Caviness 1994) 1.5–55 0.00
Herbs, field vegetables Non-flowering or harvested before flowering 0.02–5.4 0.00
Semi-natural
Grass land, shrub land
0.4–35
0.20 (late-spring) 2.82 (early-summer) 1.00 (mid-summer) 1.53 (late-summer)
Forage
Medicago sativa, hay, pasture, Trifolium spp.
1.7–60
3.67 (late-spring) 3.49 (early-summer) 4.23 (mid-summer) 1.49 (late-summer)
Forest
4.6–87
0.14 (late-spring) 0.55 (early-summer)
Apple Malus pumila 0.05–4.2 41.6 (late-spring)
Asparagus Asparagus officinalis 0.01–0.5 0.84 (early-summer)
Bean Phaseolus vulgaris 0.006–0.5 0.08 (mid-summer)
Cucumber Cucumis sativus 0.003–0.02 0.28 (late-summer)
Melon Cucumis melo 0.01–0.8 0.24 (mid-summer)
Potato
Solanum tuberosum
0.26–0.29
0.75 (early-summer) 0.88 (mid-summer)
Raspberry
Rubus idaeus, R. strigosus, R. occidentalis
0.002–0.9
2.31 (early-summer)
Squash
Cucurbita spp.
0.01–7.1
0.37 (early-summer) 0.66 (mid-summer) 1.09 (late-summer)
Strawberry
Fragaria × ananassa
0.5–3.5
12.6 (late-spring) 13.0 (early-summer)
Sunflower
Helianthus annuus
0.005–0.05
31.2 (early-summer) 33.8 (mid-summer) 36.3 (late-summer)
Watermelon Citrullus lanatus 0.01–0.2 0.14 (mid-summer)
Unknown crop
0.08–21
0–1.30 (late-spring) 0–1.57 (early-summer) 0–0.84 (mid-summer) 0–0.54 (late-summer)
Hedgerow
Areas bordering agricultural fields with shrubs or trees
0.05–6.8
0–1.30 (late-spring) 0–1.57 (early-summer) 0–0.84 (mid-summer) 0–0.54 (late-summer)
Potentially resource-providing crop
Brassica rapa, B. napus, B. juncea, Capsicum annuum, Fagopyrum esculentum, Lycopersicon esculentum, Physalis spp., Pisum sativum, Prunus avium, Pyrus communis, Rubus fruticosus
0.002–1.1
0–1.30 (late-spring) 0–1.57 (early-summer) 0–0.84 (mid-summer) 0–0.54 (late-summer)