Sweat bees
Lasioglossum spp.
Bee
Genus-level entry covering the small to tiny solitary sweat bees that visit composite flowers, herbs, and many native perennials. Underappreciated pollinators - what most people think of as 'tiny black bees' on flowers are often Lasioglossum species.
Plan for this species
Location-fit plant set for Chicago, IL: host and specialist plants first, then nectar, fruit, seed, foliage, and shelter plants that still fit the current and mid-century climate read.
0 essential relationships / 6 supporting plants
Host/specialist links: 0
Forage/pollination links: 6
Shelter links: 0
Relationship roles: 2
Canadian serviceberry
Supporting / Plants this species pollinates
Mapleleaf viburnum
Supporting / Plants this species pollinates
Wikipedia names Halictidae alongside the andrenids. Small sweat bees are among the commonest visitors to shallow radially symmetrical flowers presented in a dense platform, and the cyme of a mapleleaf viburnum is that shape at woodland-understorey height where larger bees are scarcer.
Anise hyssop
Supporting / Nectar plants
The Lady Bird Johnson Wildflower Center flags special value to native bees generally, which includes small sweat bees such as Lasioglossum that work the small two-lipped flowers.
Blue vervain
Supporting / Nectar plants
Carries the Lady Bird Johnson Wildflower Center "Special Value to Native Bees" designation, which covers small sweat bees among the native-bee guild it supports.
Boneset
Supporting / Nectar plants
Small sweat bees and other native bees forage the shallow flowers; the Lady Bird Johnson Wildflower Center lists boneset as a plant of special value to native bees and supporting conservation biological control.
Chives
Supporting / Nectar plants
Plants in the catalog
Plants this species pollinates · 2
Wikipedia names Halictidae alongside the andrenids. Small sweat bees are among the commonest visitors to shallow radially symmetrical flowers presented in a dense platform, and the cyme of a mapleleaf viburnum is that shape at woodland-understorey height where larger bees are scarcer.
Nectar plants · 15
Small native sweat bees are part of the broad native-bee guild the Lady Bird Johnson Wildflower Center notes basswood supports, though the source does not name genera.
The Lady Bird Johnson Wildflower Center flags special value to native bees generally, which includes small sweat bees such as Lasioglossum that work the small two-lipped flowers.
Carries the Lady Bird Johnson Wildflower Center "Special Value to Native Bees" designation, which covers small sweat bees among the native-bee guild it supports.
Small sweat bees and other native bees forage the shallow flowers; the Lady Bird Johnson Wildflower Center lists boneset as a plant of special value to native bees and supporting conservation biological control.
The Lady Bird Johnson Wildflower Center records "Special Value to Native Bees" for Epilobium canum; small sweat bees (Lasioglossum spp.) are among the generalist native bees that work the flowers.
The floral architecture is a short-tongued bee flower - shallow, open, radially symmetrical, presented in a dense landing platform of a cyme - and small sweat bees are among the commonest visitors to that shape across eastern North America. Marked plausible rather than documented because the sources cited here record only "attracts birds and butterflies" at a category level and do not name bee genera on this species.
Small sweat bees are among the commonest visitors to shallow open composite heads across the whole of this species range, and they are generalists that will work a stand of tickseed from first flower to last. Plausible on flower architecture, not on a cited visitation record.
A shallow, open, radially symmetrical flower massed into a dense platform is the classic short-tongued bee resource, and small sweat bees are among the commonest visitors to that shape across eastern North America. Plausible on flower architecture, not on a cited species record.
Second-year umbels are heavily worked by small native bees + hoverflies.
The Lady Bird Johnson Wildflower Center flags Special Value to Native Bees; the shallow, accessible flowers suit small native sweat bees among many other short-tongued visitors.
Small sweat bees are among the flower visitors that pollinate the tall spring blooms held above the traps; the elevated flowers are thought to keep these pollinators out of reach of the plant's own snap-traps.
Pollen plants · 22
Lady Bird Johnson Wildflower Center lists special value to native bees; the abundant early flowers feed ground- and small-bodied native bees emerging in early spring.
Small native sweat bees are typical early-spring visitors to mass-flowering Prunus; consistent with the documented Special Value to Native Bees, though not named individually by the source.
Lasioglossum sweat bees work the cup-shaped flowers heavily; the image used here documents Lasioglossum calceatum visiting a California poppy bloom at Munich Botanical Garden. The cup architecture suits short-tongued sweat bees particularly well.
Small sweat bees take pollen from the large exserted anthers, but they are the illustrative case of a visitor that is not a pollinator: they are far too small to touch both the anthers and the stigma of a flower this size, so they remove pollen without moving it usefully. Recorded because pollen removal is a real ecological transaction, not because it sets seed.
Small native sweat bees work the open composite flowers heavily for pollen during the morning bloom window.
Small sweat bees in the Lasioglossum genus visit the tiny ray florets in dense numbers; yarrow flower-head architecture supports both large and small bee species concurrently.
The Lady Bird Johnson Wildflower Center, citing the Xerces Society Pollinator Program, lists Opuntia humifusa as having special value to native bees; small sweat bees (Lasioglossum spp.) are among the native bees that forage the abundant pollen of the open yellow flowers.
Small sweat bees visit the tiny ray florets in numbers; the dense corymb supports both large and small bee species at once.
Small sweat bees commonly visit strawberry flowers for pollen. NC State Extension records a specialized native Andrena bee (A. melanochroa) on this plant; absent a matching catalog entry for that genus, small ground-nesting bees are represented here by Lasioglossum.
The Lady Bird Johnson Wildflower Center records special value to native bees. The shallow open umbels are well matched to short-tongued spring bees such as small sweat bees (Lasioglossum), which work the accessible pollen and nectar early in the season.
NC State notes the Physalis genus supports specialized native bees; small sweat bees such as Lasioglossum are among the generalist visitors that forage pollen from the open yellow flowers. Mapped at plausible confidence - the toolbox states a genus-level bee association, not a species-specific record for Physalis pruinosa.
The Wildflower Center carries the Xerces Society special-value-to-native-bees flag on this species, which is a real cited statement but a categorical one - it names no genus. Sweat bees are the commonest small native bees on open composites across eastern and central North America and the disc florets are exactly the shallow, crowded pollen source they work. Marked plausible because the flag documents the category and not the taxon.
Small sweat bees such as Lasioglossum work the pollen-rich open flowers on sunny days, when the blooms are receptive.
Wikipedia names short-tongued bees among the pollinators of this species without naming genera. Small sweat bees are the commonest short-tongued visitors to open composite flowers across North America, and a plains coreopsis stand is exactly the resource they exploit best - hundreds of shallow florets at a height a very small bee can reach. Recorded as plausible on flower architecture and abundance rather than a species-level observation.
Small sweat bees are among the commonest visitors to shallow open cymes across eastern North America, and the floral architecture here asks nothing of a visitor - no tube, no landing skill, a dense platform of tiny flowers. Listed on flower shape and regional bee fauna rather than on a record naming the genus on this species.
The Lady Bird Johnson Wildflower Center flags Helianthus tuberosus as of Special Value to Native Bees; small native sweat bees (Lasioglossum spp.) are among the generalist native bees that forage such late-summer composite sunflowers, mapped here as the closest catalog representative of that documented native-bee value.
Carries the Lady Bird Johnson Wildflower Center "special value to native bees" flag; small native sweat bees (Lasioglossum and relatives) work the spring flowers for pollen.
Range
Cosmopolitan; hundreds of species across North America.
Sources & citations
Cite this page
Use this citation for the Plotwright wildlife record. Use the source cards below to explore the references that informed its taxonomy, range, conservation, host plants, foraging, and habitat.
Plotwright. (n.d.). Sweat bees (Lasioglossum spp.). Retrieved 2026, August 20, from https://plotwright.com/wildlife/lasioglossum-spp
Sources used for this record
This record is compiled from the sources below.
Wikipedia: Lasioglossum
Genus reference for cosmopolitan Lasioglossum diversity, ground/log nesting patterns, and variable solitary-to-social life histories.
GBIF: Lasioglossum
GBIF backbone entry for the genus Lasioglossum, corroborating genus-level taxonomy and its cosmopolitan occurrence range.
iNaturalist: Lasioglossum
iNaturalist genus taxon page for Lasioglossum, corroborating genus identity and observed North American range.