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Phil Westra's Images

Organization: Colorado State University
Country: United States
89 Images of 28 Subjects View Subject List View Image Details View Thumbnails

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Image Subject Name Scientific Name Description
5362842 spurred anoda Anoda cristata Spurred anoda (Anoda cristata) plant in flower.
1624071 jointed goatgrass Aegilops cylindrica Native to Asia, has seeds that are similar in size and shape to wheat. This make contaminated shipments of wheat very difficult to clean.
1624074 jointed goatgrass Aegilops cylindrica A native to Asia, is a serious problem in wheat producing areas of the United States. It hybridizes with wheat and outcompetes the crop for nutrients and water.
5362816 Mexican fireweed Kochia scoparia Pollen grain of kochia (Kochia scoparia) under a scanning electron microscope.
5362836 velvetleaf Abutilon theophrasti Close-up view of the seed capsule of velvetleaf (Abutilon theophrasti).
5362862 nightshade Solanum spp. The flowers of a hairy nightshade.
5362882 common milkweed Asclepias syriaca Common milkweed (Asclepias syriaca) seedlings.
5362881 common milkweed Asclepias syriaca Common milkweed (Asclepias syriaca) seedlings.
5362880 common milkweed Asclepias syriaca Common milkweed (Asclepias syriaca) in bloom.
5362879 field bindweed Convolvulus arvensis Seed capsules of field bindweed (Convolvulus arvensis).
5362878 field bindweed Convolvulus arvensis Pink form of field bindweed (Convolvulus arvensis) flowers.
5362877 field bindweed Convolvulus arvensis Field bindweed plant(s), Convolvulus arvensis, emerging from underground rootstocks.
5362875 Canada thistle Cirsium arvense Seedling (or young rosette) of Canada thistle, Cirsium arvense.
5362874 shepherd's-purse Capsella bursa-pastoris Flowers and developing seedpods of shepherd's purse (Capsella bursa-pastoris).
5362873 common cocklebur Xanthium strumarium Close-up view of the flower of common cocklebur (Xanthium strumarium).
5362872 common cocklebur Xanthium strumarium Common cocklebur (Xanthium strumarium) seedling with 2 true leaves.
5362869 common purslane Portulaca oleracea Common purslane plant (Portulaca oleracea) in flower.
5362867 common purslane Portulaca oleracea Close-up of a seedling common purslane plant (Portulaca oleracea).
5362866 common purslane Portulaca oleracea Close-up of a seedling common purslane plant (Portulaca oleracea).
5362865 black nightshade Solanum nigrum Potted plants of American black nightshade (Solanum nigrum).
5362864 Colorado potato beetle Leptinotarsa decemlineata Eggs of the Colorado potato beetle (Leptinotarsa decemlineata) on the underside of a black nightshade leaf (Solanum nigrum).
5362863 hairy nightshade Solanum physalifolium Hairy nightshade plant (Solanum sarrachoides) -- young plant.
5362861 hairy nightshade Solanum physalifolium Immature fruits of hairy nightshade (Solanum sarrachoides), showing a star pattern.
5362860 black nightshade Solanum nigrum Fruits of eastern black nightshade (Solanum nigrum).
5362859 hairy nightshade Solanum physalifolium Fruits of  hairy nightshade (Solanum sarrachoides), which do not darken to a blackish color.
5362858 hairy nightshade Solanum physalifolium Calyx details on the fruits of hairy nightshade (Solanum sarrachoides).
5362857 black nightshade Solanum nigrum Fruits of eastern black nightshade (Solanum nigrum) on the left, compared with those of hairy nightshade (S. sarrachoides) on the right.
5362856 hairy nightshade Solanum physalifolium Seedling hairy nightshade plant (Solanum sarrachoides) with first set of true leaves.
5362855 hairy nightshade Solanum physalifolium Seedling hairy nightshade plant (Solanum sarrachoides).
5362854 cutleaf nightshade Solanum triflorum Cutleaf nightshade plant (Solanum triflorum).  
5362852 buffalobur Solanum rostratum Buffalobur plant (Solanum rostratum).
5362851 jimsonweed Datura stramonium Close-up view of a jimsonweed (Datura stramonium) pod.
5362850 jimsonweed Datura stramonium Close-up view of jimsonweed (Datura stramonium) flowers and buds.
5362848 jimsonweed Datura stramonium Close-up view of a jimsonweed (Datura stramonium) seedling, with cotyledons.
5362847 puncturevine Tribulus terrestris Close-up view of a flower and ripening seeds of puncturevine (Tribulus terrestris).
5362846 puncturevine Tribulus terrestris Seedling puncturevine (Tribulus terrestris) plant.
5362845 puncturevine Tribulus terrestris Seedling puncturevine (Tribulus terrestris) with cotyledons.
5362844 common mallow Malva neglecta Small plant of common mallow (Malva neglecta).
5362843 spurred anoda Anoda cristata Seed capsule of spurred anoda (Anoda cristata).
5362841 spurred anoda Anoda cristata Seedling spurred anoda (Anoda cristata) plants at the 2-leaf stage.
5362840 Venice mallow Hibiscus trionum Close-up view of the flower of Venice mallow (Hibiscus trionum).
5362839 Venice mallow Hibiscus trionum Small Venice mallow plant (Hibiscus trionum).
5362837 Venice mallow Hibiscus trionum Close-up view of the seedling of Venice mallow (Hibiscus trionum).
5362835 velvetleaf Abutilon theophrasti Infestation of velvetleaf (Abutilon theophrasti) in a waste area in Morgan County, Colorado.
5362833 velvetleaf Abutilon theophrasti Velvetleaf plant (Abutilon theophrasti) in bloom.
5362831 velvetleaf Abutilon theophrasti Seedling velvetleaf (Abutilon theophrasti).
5362828 toothed spurge Euphorbia dentata Close-up view of the flowers of toothed spurge (Euphorbia dentata).
5362827 toothed spurge Euphorbia dentata Toothed spurge (Euphorbia dentata) -- medium-size plants.
5362826 toothed spurge Euphorbia dentata Close-up view of a seedling of toothed spurge (Euphorbia dentata) at the 2-leaf stage.
5362825 toothed spurge Euphorbia dentata Close-up view of a seedling of toothed spurge (Euphorbia dentata).
5362824 common sunflower Helianthus annuus Common sunflower (Helianthus annuus) growing as a weed.
5362823 common sunflower Helianthus annuus Seedlings of common sunflower (Helianthus annuus).
5362822 common sunflower Helianthus annuus Seedlings of common sunflower (Helianthus annuus).
5362821 common sunflower Helianthus annuus Seedlings of common sunflower (Helianthus annuus) with cotyledons.
5362820 Russian-thistle Salsola tragus Close-up view of a Russian thistle (Salsola iberica, S. tragus) flower.
5362818 Russian-thistle Salsola tragus Close-up view of a Russian thistle (Salsola iberica, S. tragus) seedling.
5362819 Russian-thistle Salsola tragus Close-up view of a Russian thistle (Salsola iberica, S. tragus) seedling.
5362817 Mexican fireweed Kochia scoparia Close-up view of the red flowers of kochia (Kochia scoparia).
5362815 Mexican fireweed Kochia scoparia Very close-up view of the yellow flowers of kochia (Kochia scoparia).
5362814 Mexican fireweed Kochia scoparia Close-up view of the flowers of kochia (Kochia scoparia).
5362813 Mexican fireweed Kochia scoparia Close-up view of the green stem of kochia (Kochia scoparia).
5361308 Mexican fireweed Kochia scoparia Close-up view of the red stem of kochia (Kochia scoparia).
5361307 Mexican fireweed Kochia scoparia Close-up view of variation in leaf shape and size in kochia (Kochia scoparia).
5361303 Mexican fireweed Kochia scoparia Dense stand of kochia (Kochia scoparia) seedlings beneath mother plant.
5361302 Mexican fireweed Kochia scoparia Dense stand of  kochia (Kochia scoparia) seedlings in spring.
5361301 Mexican fireweed Kochia scoparia Seedling kochia (Kochia scoparia) with multiple side shoots.
5361300 Mexican fireweed Kochia scoparia Seedling of kochia (Kochia scoparia) in early spring.
5361299 lambsquarters Chenopodium album Common lambsquarters (Chenopodium album) seedling at the 2-leaf stage.
5361298 redroot pigweed Amaranthus retroflexus Redroot pigweed (Amaranthus retroflexus) growing among weedy grasses.
5361296 redroot pigweed Amaranthus retroflexus Intermediate-size seedling of redroot pigweed (Amaranthus retroflexus).
5361294 redroot pigweed Amaranthus retroflexus Seedling of redroot pigweed (Amaranthus retroflexus) at the 2-leaf stage.
5361293 redroot pigweed Amaranthus retroflexus Seedling of redroot pigweed (Amaranthus retroflexus) at the cotyledon stage.
5362876 Canada thistle Cirsium arvense Canada thistle plants (Cirsium arvense) infesting field corn.
5362834 velvetleaf Abutilon theophrasti
5362832 velvetleaf Abutilon theophrasti Velvetleaf (Abutilon theophrasti) seedlings among young field corn plants.
5361306 Mexican fireweed Kochia scoparia Mature patch of triazine resistant kochia (Kochia scoparia) in field corn.
5361305 Mexican fireweed Kochia scoparia Dense patch of triazine resistant kochia (Kochia scoparia) in field corn.
5361304 Mexican fireweed Kochia scoparia Seedlings of kochia (Kochia scoparia) among field corn seedlings.
5361297 redroot pigweed Amaranthus retroflexus Close-up view of a dense infestation of redroot pigweed (Amaranthus retroflexus) in field corn.
5361295 redroot pigweed Amaranthus retroflexus Infestation of redroot pigweed (Amaranthus retroflexus) in field corn.
5362871 lanceleaf sage Salvia reflexa Lanceleaf sage (Salvia reflexa) growing as a weed in a carrot field.
5362870 lanceleaf sage Salvia reflexa Lanceleaf sage (Salvia reflexa) growing as a weed among dry beans.
5362853 buffalobur Solanum rostratum Buffalobur plants (Solanum rostratum) blooming in a crop of dry beans.
5362849 jimsonweed Datura stramonium Distant view of jimsonweed plants (Datura stramonium) growing in a dry bean field.
5362829 wild buckwheat Fallopia convolvulus Seedling of wild buckwheat (Polygonum convolvulus).
5362830 wild buckwheat Fallopia convolvulus Seedling of wild buckwheat (Polygonum convolvulus).
5362868 common purslane Portulaca oleracea Large common purslane (Portulaca oleracea) plant growing in an onion field.
5362838 Venice mallow Hibiscus trionum Seedlings of Venice mallow (Hibiscus trionum) in an onion field.
5361455 garden onion Allium cepa Demonstration of topping onions by hand, during harvest.

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