by Bob Harms 

The leaves shown below were collected on 11 March 2014 in support of a hypothesis that a large natural population of over a hundred camphor–scented plants (i.e., putative H. reverchonii var. serpyllifolia) do not exhibit variation of the sort that might be expected of a hybrid.
Details of the collection from the test population plus access to additional images are given on a separate page.

Additionally leaves from other taxa were collected for comparison:

• H. drummondii
  • Travis Co.
  • Hays Co.
• H. reverchonii var. reverchonii
• A hybrid (Hays Co.)

The scale on the images is 1 cm — the same for all images. All are 18% of the original scan at 2400 dpi. Click on an leaf image for a larger view (37%) plus the stem from which the leaves were taken.

H. reverchonii var. serpyllifolia leaves from 29 plants in a natural population (Hays Co.).

H. drummondii (Travis Co.)	H. reverchonii var. reverchonii (Travis Co.)
H. drummondii (Hays Co.), a potential hybrid from an area known to have hybrids, but with a strong peppermint scent.	Hybrid of H. drummondii and likely H. reverchonii var. serpyllifolia (Hays Co.) — scent testing by several botanists indicate mint (but not peppermint), camphor and a citrus (different from H.r.r.)