E-Flora BC: Electronic Atlas of the Flora of British Columbia

Solanum rostratum Dunal
buffalo-bur (buffalobur nightshade)
Solanaceae (Potato family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #7526)

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Distribution of Solanum rostratum
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Solanum species are distinctive plants in the Potato or Tomato Family, with 'tomato' type flowers that have typical recurved petals and bright yellow stamens, and alternate leaves.

Species Information

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Annual herb from a taproot; stems erect, 10-70 cm tall, solitary, branched, hairy, the hairs star-shaped, also with yellow spines 3-12 mm long.
Basal leaves lacking; stem leaves 6-20 cm long, 2-7 cm wide, lobed, the lobes mostly rounded, hairy, the hairs star-shaped, also spiny on the midveins.
Inflorescence of terminal racemes on short stalks with 3-15 flowers; corollas light yellow, 2-3 cm wide when expanded; calyces enclosing the fruit, prickly; anthers unequal, 1 anther curved and about 4 mm longer than the others.
Berries, globe-shaped, 9-12 mm; seeds 2-2.5 mm wide.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry waste places and roadsides in the lowland and steppe zones; rare in S BC; introduced from central US.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Androcera rostrata
Solanum cornutum

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References