JALAP. 



145 



Starch, ducts, crystals, tracheids, resin masses, and 

 parenchyma. 



The starch grains of jalap are large ; simple and com- 

 pound forms abound. The larger simple grains are gen- 



FiG. 37. — Jalap in Powder. 

 S, Starch; C, crystals; R, resin globules; Co, corky tissue; Pr, 

 parenchyma; T, tracheid; V, vessels with slit-shaped and border 

 pores. 



erally dense, rounded or broadly oval, sometimes ovate, 

 with an eccentric, generally simple, hilum and pronounced 

 concentric markings. Their polarization cross is irregu- 

 lar. The smaller simple grains and the compound grains, 

 which latter are in twos or threes, rarely more, have 



