buffalo-bur (buffalobur nightshade)
Solanaceae (Potato family)
Introduction to Vascular Plants
Introduction
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.
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Species Information
General:
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.
Leaves:
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.
Flowers:
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.
Fruits:
Berries, globe-shaped, 9-12 mm; seeds 2-2.5 mm wide.
Illustration
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Habitat and Range
Mesic to dry waste places and roadsides in the lowland and steppe zones; rare in S BC; introduced from central US.Status Information
Synonyms
Synonyms and Alternate Names:
Androcera rostrata
Solanum cornutum
Taxonomic Keys
1. Plants climbing or scrambling perennial vines; flowers purple; fruits red.....................Solanum dulcamara
1. Plant annual herbs, not climbing; flowers white or yellow; fruits green or black. 2. Plant spiny; flowers yellow, 2-3 cm wide......................Solanum rostratum 2. Plants not spiny; flowers white or creamy, less than 1 cm wide. 3. Leaves deeply lobed....................................Solanum triflorum 3. Leaves entire, toothed or wavy margined. 4. Calyces 4-6 mm long at maturity, cupping the fruit; stems with spreading hairs.............................Solanum physalifolium 4. Calyces 2-3 mm long at maturity, not cupping the fruit; stems smooth or appressed-hairy...............................Solanum americanum Source: The Illustrated Flora of British Columbia Note that Solanum nigrum (with two subspecies) was added to the BC flora after the publication of the Illustrated Flora, and is not included in this key. It may be confused with Solanum americanum and features overlap, but with good fruiting or flowering material these two species but may be separated as follows: 1. Corollas > 5 mm diameter, anthers 1.5 - 3.0 mm, petals whitish, seeds 1.5 - 2.5 mm, inflorescence raceme-like with an often extended central axis, fruit often dull when mature...................S. nigrum 1. Corollas ca. 4.5 mm diameter, anthers < 1.5 mm, petals whitish to faintly to strongly purple-tinged, seeds 1 -1.5 mm, inflorescence umbel-like with a very short central axis, fruit often shiny when mature.................S. americanum 2. plants subglabrous or often with appressed non-glandular hairs on the stems and leaves...............subsp. nigrum 2. plants villous with spreading glandular multi-celled hairs...........subsp. schultesii Source: Frank Lomer, 2010. |