714 BOTANY AND PHARMACOGNOSY. 



POWDERS OF A GREENISH COLOR. 



In this group are included all those drugs which in a pow- 

 dered condition are of a light-green, yellowish-green or dark- 

 green (sap-green) color. Most of the powders of the leaves and 

 herbs belong to this class. 



I. CRYSTALS OF CALCIUM OXALATE PRESENT. 

 A. CRYSTALS IN ROSETTE AGGREGATES. 



a. GLANDULAR AND NON-GLANDULAR HAIRS PRESENT. 



1. CANNABIS INDICA.— Dark green (Figs. 284, C; 279) ; 

 non-glandular hairs, i-celled, more or less curved, with numerous 

 slight projections, and sometimes with cystoliths of calcium 

 carbonate; glandular hairs two kinds — either with short unicel- 

 lular or multicellular stalks — and 8- to i6-celled glandular heads; 

 calcium oxalate, in rosette aggregates about 20 /x, in diameter; 

 numerous oil globules and resin fragments ; few nearly spherical 

 pollen grains 25 to 35 /u, in diameter, with numeroiis centrifugal 

 projections, among club-shaped unicellular hairs of style; ducts 

 spiral or with simple or bordered pores; sclerenchymatous fibers 

 long, thin-walled, non-lignifiedj and with few simple pores; lati- 

 ciferous vessels with reddish-brown contents. When mature seeds 

 are present, palisade-like stone cells occur, which are very thick- 

 walled, and have a small lumen. 



2. ERIODICTYON. — Dark green ; calcium oxalate in rosette 

 aggregates, 20 to 25 /* in diameter; non-glandular hairs i -celled 

 and thick- walled (Fig. 283, A) ; glandular hairs with i-celled 

 stalk and 6- to 8-celled glandular head (Fig. 285, F). In pow- 

 der of the stems occur : ducts, spiral or with simple or bordered 

 pores ; sclerenchymatous fibers either non-lignified and thin- 

 walled, or lignified and thick-walled, and with numerous simple 

 pores; pith cells somewhat tabular, thick- walled, slightly ligni- 

 fied, and with numerous simple pores. 



3. GALLA (Chinese or Japanese). — Grayish-green; calcium 

 oxalate crystals about 20 /u, in diameter ; starch grains 15 to 40 /^ 



