Piptostegia Root, Piptostegia Pisonis Mart., so-called "Brazilian Jalap"**Contribution from Pharmacognosy Laboratory, Bureau of Chemistry, Department of Agriculture, Washington, D.C

Clare Olin Ewing, Joseph F. Clevenger
1918 The Journal of the American Pharmaceutical Association (1912)  
AMERICAN PHARMACgUTICAL ASSOCIATION 855 and 3 mm. in thickness. From the general resemblance of this root to that of Brazilian Jalap and to that of Mexican Scammony, I would hazard the guess that it is from some plant closely allied to them and consequently from the morning glory family, the Conuolvulaceae. W. I,. Scoville, who is working out the chemistry of the drug, has informed me that in so far as he can tell from the limited amount of work he has been enabled to give to it, it does not
more » ... it, it does not d8er materially from the resin of Mexican Scammony except in its yel!ow color. Under the microscope the root structure differs from the Brazilian Jalap in having no rosette crystals or crystal fibers, in having a superabundance of starch, the grains being of a more uniform size of from 0.013 mm.-0.018 mm., the vessels being chiefly of the pitted type, wood fibers are plentifu! and there is some bast fiber. In Brazilian Jalap, oil with refractive inclusions, perhaps oleoresin, was scarce and where present was arranged in masses, rather than in drops, in longitudinal lines, mostly in connection with the medullary ray cells; but most of the cells of the samples I had for examination were empty, while on the other hand in the Resina Drastica samples the cells were well filled with the products of metabolism and as in the case of the starch there was a superabundance of large drops of oil with its inc!usions throughout the cortex. Wood fibers in this drug measure for the most part from 0.704 mm. to 0.892 mm. in length, about 0 . 0 2 to 0.03 mm. wide, the lumen being about '/a the width of the cell.
doi:10.1002/jps.3080071007 fatcat:eeupw52yhzbkdfftmnb32gye7m