Solanum rostratum Dunal
Buffalobur nightshade, Buffalo bur
Solanaceae (Potato Family)
Synonym(s): Androcera rostrata, Solanum cornutum
USDA Symbol: SORO
The prickles on this highly toxic plant help to discourage grazing by livestock. An equally prickly species of about the same habit, Melonleaf Nightshade (S. citrullifolium), has blue-violet corollas.
From the Image Gallery
Bloom InformationBloom Color: Yellow
Bloom Time: May , Sep
DistributionUSA: AL , AR , AZ , CA , CO , CT , DC , DE , GA , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , UT , VA , VT , WA , WI , WV , WY
Native Distribution: Throughout much of southern Canada and United States; in West, probably more common in southern part; also in northern Mexico.
Native Habitat: Found in dry, calcareous soil in full sun with little water. This plant is very abundant in the Texas hill country.
Growing ConditionsLight Requirement: Sun
Conditions Comments: This plant is extrememly low maintenance and has prickles to protect itself from harm. This plant comes into the landscape when all other things disappear and can survive will no water and bad soil.
BenefitUse Wildlife: Seeds are important dove and quail food.
Conspicuous Flowers: yes
Fragrant Flowers: yes
Interesting Foliage: yes
Deer Resistant: High
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Fredericksburg Nature Center - Fredericksburg, TX
Lady Bird Johnson Wildflower Center - Austin, TX
Sibley Nature Center - Midland, TX
Brackenridge Field Laboratory - Austin, TX
Patsy Glenn Refuge - Wimberley, TX
Native Seed Network - Corvallis, OR
Herbarium Specimen(s)NPSOT 0128 Collected Sept. 9, 1991 in Bexar County by Lottie Millsaps
NPSOT 0025 Collected July 22, 1990 in Bexar County by Judith C. Berry
NPSOT 0446 Collected Jun 4, 1987 in Bexar County by Harry Cliffe
NPSOT 0946 Collected Sep 1, 1994 in Bexar County by Harry Cliffe
Wildflower Center Seed BankLBJWC-0110 Collected 2007-07-10 in Travis County by Lady Bird Johnson Wildflower Center
BibliographyBibref 281 - Shinners & Mahler's Illustrated Flora of North Central Texas (1999) Diggs, G. M.; B. L. Lipscomb; B. O'Kennon; W. F...
Bibref 328 - Wildflowers of Texas (2003) Ajilvsgi, Geyata.
Bibref 286 - Wildflowers of the Texas Hill Country (1989) Enquist, M.
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Additional resourcesUSDA: Find Solanum rostratum in USDA Plants
FNA: Find Solanum rostratum in the Flora of North America (if available)
Google: Search Google for Solanum rostratum
MetadataRecord Modified: 2008-12-17
Research By: NPC