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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.