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Table 2 Mean diameter of inhibition zones (mm) where bacterial growth was inhibited by plant extracts.

From: Antibacterial activity of traditional medicinal plants used by Haudenosaunee peoples of New York State

   Mean inhibition zone diametera
   Gram-negative organisms Gram-positive organisms
Plant Species Portionb E. coli (PI No.336) S. typhimurium (PI No.381) S. aureus (PI No.4651) S. lactis (PI No.525)
Haudenosaunee medicinal plants
A. millefolium FL ------ 8.8 9.6 ------
H. pilosella FL ------ ------ 8.1 ------
  LV ------ ------ 9.0 ------
  ST ------ 9.1 ------ ------
I. pandurata FL ------ ------ 7.3 ------
  LV 10.2 11.1 15.8 12.3
S. canadensis LV ------ ------ 9.3 ------
Plants with no known medicinal use by Haudenosaunee
S. virginica LV ------ ------ 7.9 ------
H. matronalis ST ------ 11.1 ------ ------
R. multiflora FL 9.0 8.1 ------ ------
  LV 7.6 ------ ------ ------
Ampicillin (10 mg/mL)   35.0 29.6 37.9 33.2
Water   ------ ------ ------ ------
  1. a Values represent the mean of three replicates; the pooled SD of all means = 0.60 mm.
  2. b 10 μL of each extract (100 mg/mL fresh water extraction) was used for each plant portion; FL, LV, and ST denote flowers, leaves, and stems, respectively.