The Collaborative International Dictionary of English v.0.48:

Styptic \Styp"tic\, a. [L. stypticus, Gr. ?, fr. ? to contract.]
   Producing contraction; stopping bleeding; having the quality
   of restraining hemorrhage when applied to the bleeding part;
   astringent. [Written also stiptic.]
   [1913 Webster]

   Styptic weed (Bot.), an American leguminous herb (Cassia
      occidentalis) closely related to the wild senna.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Cassia occidentalis
    n 1: very leafy malodorous tropical weedy shrub whose seeds have
         been used as an adulterant for coffee; sometimes classified
         in genus Cassia [syn: coffee senna, mogdad coffee,
         styptic weed, stinking weed, Senna occidentalis,
         Cassia occidentalis]