According to observations of naturalists and beekeepers.
Where are you?
It is native to western North America from Alaska, through British Columbia, to northwestern California. It grows in temperate coniferous forest, primarily in the Cascade Range and the Pacific Coast Ranges.
This plant is present in at least 5 states/provinces in this country.
Trees, sometimes shrubs, 50–100(–200) dm.
Stems (12–)20–30(–40) cm diam.; bark gray to reddish-brown, smooth when young, scaly and deeply fissured at maturity; young branches reddish, puberulent when young, becoming reddish-brown or gray and glabrous; lateral flowering shoots becoming spurs, 10–30(–50) mm. Buds red-brown, ovoid, 1.5–4 mm, scale margins ciliate.
Leaves conduplicate in bud; isomorphic; stipules deciduous, narrowly lanceolate, 1–5 mm, apex acuminate; petiole 10–30 mm, tomentose, glabrescent; blade ovate, sometimes oval, elliptic, or lanceolate, 3–9(–11) × 1–4 cm, base rounded to cuneate, margins unlobed or 3-lobed, serrate to doubly serrate, sometimes serrulate, apex acute or acuminate, abaxial surface glabrous, adaxial puberulent.
Panicles corymblike; peduncles absent; bracts absent; bracteoles sometimes persistent, filiform, 1–4 mm. Pedicels 15–40 mm, villous or glabrous.
Flowers 15–20 mm diam.; hypanthium glabrous or tomentose; sepals triangular, 3–6 mm, shorter than tube, apex apiculate, abaxial surface glabrous, adaxial hoary-tomentose; petals white, sometimes pink, orbiculate to obovate, (6–)10–15 mm, claws 1.5–2 mm, margins erose or undulate, apex rounded; stamens ca. 20, 4–6 mm, anthers white before dehiscence; styles 3(or 4), connate in proximal 1/3, 6–7 mm, longer than stamens, glabrous. Pomes yellow to purplish red, oblong, sometimes ovoid or obovoid, 6–10(–13) mm diam., cores enclosed at apex; sepals deciduous, sometimes tardily; sclereids abundant surrounding core.
Seeds reddish brown. 2n = 34.
Flowering April – early July; fruiting June – November.
Brassica napus (aka: Rapeseed)
Sinapis arvensis (aka: Charlock mustard, California rape, Charlock, Corn mustard, Canola, Kaber mustard, Rapeseed mustard)
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)
Calendula officinalis (aka: Marigold, Calendula, Pot marigold, English marigold)
Cucumis melo (aka: Cantaloupe, Rockmelon, Sweet melon, Spanspek, Honeydew melon, Honeymelon, Crenshaw, Casaba)
Citrullus lanatus (aka: Watermelon)
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)
Borago officinalis (aka: Borage, Starflower, Common borage, Cool-tankard, Tailwort)
