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Marcus, Joseph A.
Solanum rostratum Dunal
Buffalobur nightshade, Buffalo bur
Synonym(s): Androcera rostrata, Solanum cornutum
USDA Symbol: soro
USDA Native Status: L48 (N), CAN (W)
Dense, golden-yellow prickles cover the stems and calyx of each yellow, star-like flower on this leafy weed.
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.
Plant CharacteristicsDuration: Annual Habit: Herb Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: May , Sep
, 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
Herbarium Specimen(s)NPSOT 0128
Collected Sept. 9, 1991 in Bexar County by Lottie MillsapsNPSOT 0946
Collected Sep 1, 1994 in Bexar County by Harry CliffeNPSOT 0025
Collected July 22, 1990 in Bexar County by Judith C. BerryNPSOT 0446
Collected Jun 4, 1987 in Bexar County by Harry Cliffe
Wildflower Center Seed BankLBJWC-0110
Collected 2007-07-10 in Travis County by Lady Bird Johnson Wildflower Center
Record Last Modified: 2008-12-17
Research By: NPC