Burke: Solanum pseudocapsicum vs. Solanum rostratum

	Solanum pseudocapsicum	Solanum rostratum
		buffalo bur, horned nightshade
Habit		Coarse, erect, branching annual 3-10 dm. tall, the herbage and flowers stellate-pubescent, the calyces, stems, and often the leaves covered with yellow spines 3-12 mm. long.
Leaves		Leaves petiolate, 6-20 cm. long and 2-7 cm. wide, deeply pinnately lobed, the lobes broad and round-tipped, and may again be shallowly lobed.
Flowers		Inflorescence of several 3- to 15-flowered racemes, attached along the stem or opposite the leaves, elongating up to 1.5 dm. in fruit; corolla rotate, light yellow, with 5 short lobes, 2-3 cm. wide; stamens 5, with one anther much longer than the other 4; style solitary; ovary superior.
Fruits		Fruit a berry

	Solanum pseudocapsicum	Solanum rostratum
Flowering time		June-September
Habitat		Roadsides and other disturbed areas, often where dry.
Distribution	[WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]
Origin		Introduced from central US
Conservation status		Not of concern
Sibling taxa	S. americanum, S. carolinense, S. dulcamara, S. elaeagnifolium, S. lycopersicum, S. nigrum, S. physalifolium, S. rostratum, S. triflorum, S. tuberosum	S. americanum, S. carolinense, S. dulcamara, S. elaeagnifolium, S. lycopersicum, S. nigrum, S. physalifolium, S. triflorum, S. tuberosum
Web links	Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Solanum pseudocapsicum

Solanum rostratum

buffalo bur, horned nightshade

Habit

Coarse, erect, branching annual 3-10 dm. tall, the herbage and flowers stellate-pubescent, the calyces, stems, and often the leaves covered with yellow spines 3-12 mm. long.

Leaves

Leaves petiolate, 6-20 cm. long and 2-7 cm. wide, deeply pinnately lobed, the lobes broad and round-tipped, and may again be shallowly lobed.

Flowers

Inflorescence of several 3- to 15-flowered racemes, attached along the stem or opposite the leaves, elongating up to 1.5 dm. in fruit;

corolla rotate, light yellow, with 5 short lobes, 2-3 cm. wide;

stamens 5, with one anther much longer than the other 4;

style solitary;

ovary superior.

Fruits

Fruit a berry