POWDERED DRUGS AND FOODS. 719 



have either a 3-celled or multicellular stalk and a large, multicel- 

 lular head. Mountain Ash or European Rowan {Sorbiis Aucii- 

 paria) possesses long, thin-walled, non-glandular hairs with 

 rounded base. Mulberry leaves {Morns alba and M. nigra) 

 have cystoliths in epidermal cells, non-glandular and glandular 

 hairs, the latter with unicellular stalk and 5- to 9-celled head. 

 Oak leaves (Qncrcus pcdiinculata and Q. scssiliUora) have 2- to 

 3-celled, non-glandular hairs and stomata only on epidermis of 

 lower surface. Sloe leaves {Prunus spinosa) have rather char- 

 acteristic crystal fibers. Strawberry \Fragaria vesca) has long, 

 unicellular, non-glandular hairs, the basal portion of which has 

 a thick wall with simple pores, and glandular hairs consisting 

 of a 3-celled stalk and large head, the cells swelling considerably 

 in chloral solutions. The leaves of the willow-herb {Epilo- 

 hium angustifoliuiu) contain numerous raphides and the non- 

 glandular hairs are slightly wavy, rather broad and with rounded 

 ends. Willow leaves (species of Salix) have small stomata 

 (about 25 IX in diameter) with two accompanying cells; the hairs 

 are crooked and with thin walls ; the calcium oxalate occurs in 

 rosette aggregates and monoclinic prisms. Wistaria (Kraunhia 

 Horihiinda) has non-glandular hairs with 2 short basal cells and 

 a long, thin-walled pointed cell ; stomata only occur in the lower 

 epidermis. 



c. glandular and non-glandular hairs wanting. 



9. BUCHU. Light green ; calcium oxalate in rosette aggre- 

 gates, 15 to 25 /x, in diameter ; epidermal cells with irregular masses 

 or sphero-crystals of a carbohydrate, 30 to .50 ix in diameter, and 

 with walls modified to mucilage ; oil globules numerous (Fig. 158). 



10. CONIUM. Grayish-green or yellowish-brown (Fig. 

 248) ; calcium oxalate crystals in rosette aggregates, i to 2 ju, in 

 diameter, those in aleurone grains about 5 /* in diameter; paren- 

 chyma with chloroplastids and starch grains 2 to 4 /a in diameter ; 

 sclerenchymatous fibers long, thin-walled, wath numerous simple 

 oblique pores ; intermediate fibers with reticulated walls ; cells 

 of pericarp nearly isodiametric, yellowish, irregularly thickened, 

 somewhat collenchymatous ; oil globules numerous. 



