7i6 



BOTANY AND PHARMACOGNOSY. 



in diameter and lOO to i6o fx. long; fragments of T-shaped non- 

 glandular hairs less numerous than in Dalmatian powder; char- 

 acteristic, isolated, somewhat rounded or elliptical parenchyma 

 cells, also occurring in papillae-like fragments ; fragments of 



Fig. 280. Flores Pyrethri (Insect flowers): sc, stone cells; ep, upper epidermis ot 

 a bract; h, h, non-glandular hairs of bracts; ept, papilte on the upper surface of the ligulate 

 corolla; St, St', loose parenchyma of the ligulate corolla; g, a trachea of a bract with annular 

 thickening; S, tooth of a tubular floret, some of the cells of which contain rosette aggregates 

 of calcium oxalate; ep', epidermis of the under surface of a ligulate corolla; P, section of 

 pappus showing some of the lignified cells, some of which contain monoclinic prisms as 

 shown at rh; pa, parenchyma of a bract; Fr, somewhat thickened, porous cells of the 

 pericarp; D, glandular hairs found on the wall of the ovary; po, pollen grains; iep, cells 

 of the involucre between the bracts. After Hanausek. 



acute papillae (epidermis of corolla), which are more numerous 

 than in Dalmation powder ; glandular hairs about 50 /x in diameter, 

 being smaller than in Dalmatian powder ; rose-colored fragments 

 in chloral mounts possibly more numerous in the Persian powder. 



