According to observations of naturalists and beekeepers.
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Toxic for bees
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Mexican buckeye grows from the Edwards Plateau of south-central Texas west to Trans-Pecos Texas, and into southern New Mexico and northeastern Mexico.
This plant is present in at least 2 states/provinces in this country.
Mexican buckeye grows as an upright or spreading, multistemmed shrub or small tree. It commonly reaches 4 to 15 feet (1.2-4.6 m) in height but on favorable sites can grow to 30 feet (9.5 m) with trunk diameters of 10 inches (25.4 cm). The bark is a mottled light gray to brown, with shallow fissures developing on old trunks. Slender brown to orange, pubescent twigs become reddish-brown and glabrous with age. Some roots grow horizontally along the rock or soil surface while others extend deep into the vertical face of soft rock cliffs.
Leaves of Mexican buckeye are deciduous, alternate, and odd-pinnately compound. The three to seven ovate-lanceolate leaflets are leathery with crenate-serrate margins. The upper surface is dark green and glabrous, whereas the lower surface is paler and pubescent to glandular.
Small fragrant flowers are rose to purplish-pink and are borne in clusters on bare stems. The fruit is a woody, reddish-brown, three-lobed pod or capsule 1 to 1.5 inches (2.5-3.8 cm) in diameter. The shiny, dark brown to black, rounded seeds average approximately 0.4 to 0.6 inch (1-1.5 cm) in diameter. Seeds are smooth, leathery and "buckeye lake". Each capsule generally contains a single seed.
Mexican buckeye flowers approximately 10 days after buds first appear. In Trans-Pecos Texas, flowering occurs from March to June. Leaves develop soon after the flowers. Fruit ripens in July or as late as August or October. The fruit turns dark brown in the fall and unopened capsules may persist through the winter.
Ungnadia speciosa (aka: Mexican buckeye, Texas buckeye, Canyon buckeye, Spanish buckeye, New Mexican buckeye, New Mexico buckeye, False buckeye, Monillo, Monilla)
Salix lucida (aka: Shining willow, Greenleaf willow, Tail-leaf willow, Whiplash willow, Pacific willow, Lance-leaf willow, Longleaf willow, Red willow, Western shining willow)
Salix scouleriana (aka: Scouler's willow, Upland willow)
Prunus emarginata (aka: Bitter cherry)
Salix bebbiana (aka: Bebb willow, Beak willow, Beaked willow, Long-beaked willow, Diamond willow, Chaton, Petit Minou, Smooth Bebb willow)
Salix boothii (aka: Booth's willow)
Robinia pseudoacacia (aka: Black locust, False acacia, Yellow locust, White locust, Green locust, Post locust, Falsa acacia, Robinia)
Astragalus (aka: Milkvetch, Locoweed, Goat's-thorn)
Rubus idaeus (aka: Raspberry, Black-haired red raspberry, Brilliant red raspberry, American red raspberry, Red raspberry, Smoothleaf red raspberry, Wild raspberry, Wild red raspberry, Grayleaf raspberry)
Salix monticola (aka: Park willow, Cherry willow, Mountain willow, Serviceberry willow, White willow)
Rhus glabra (aka: Smooth sumac, Common sumac, Rocky Mountain sumac, Red sumac, Western sumac, White sumac)
Brassica napus (aka: Rapeseed)
Sinapis arvensis (aka: Charlock mustard, California rape, Charlock, Corn mustard, Canola, Kaber mustard, Rapeseed mustard)
Gleditsia triacanthos (aka: Honey locust, Honey shucks locust, Common honeylocust, Sweet bean locust)
Asclepias tuberosa (aka: Butterflyweed, Butterfly Milkweed, Orange Milkweed, Pleurisy Root, Chigger Flower, Canada root, Fluxroot, Indian paintbrush, Indian posy, Orange root, Orange Swallow-wort, Tuber root, Yellow milkweed, White-root, Windroot, Butterfly love)
Prunus virginiana (aka: Chokecherry, Western chokecherry, Common chokecherry, Black chokecherry)
Salix glauca (aka: Grayleaf willow, Gray willow, Gray-leaved willow)
Salix geyeriana (aka: Geyer willow, Silver willow)
Salix brachycarpa (aka: Shortfruit willow, Barren-ground willow, Small-fruit sand dune willow, Small-fruit willow)
Rubus parviflorus (aka: Thimbleberry, Western thimbleberry)
Amorpha fruticosa (aka: Desert false indigo, False indigo-bush, Bastard indigobush, Indigo Bush)
Brassica rapa (aka: Field mustard, Common mustard, Wild mustard, Wild turnip, Forage turnip, Wild rutabaga, Birdsrape mustard, Rape mustard)
Echium vulgare (aka: Viper's bugloss, Blueweed, Blue thistle)
Rubus armeniacus (aka: Himalayan blackberry, Rubus discolor, Rubus procerus)
Salix planifolia (aka: Diamondleaf willow, Planeleaf willow)
Cirsium arvense (aka: Creeping Thistle, Canada thistle, Field thistle, California thistle, Lettuce from hell thistle, Corn thistle, Cursed thistle, Green thistle, Hard thistle, Perennial thistle, Prickly thistle, Small-flowered thistle, Way thistle, Stinger-needles)
Cucumis melo (aka: Cantaloupe, Rockmelon, Sweet melon, Spanspek, Honeydew melon, Honeymelon, Crenshaw, Casaba)
Citrullus lanatus (aka: Watermelon)