402 SCIENTIFIC AND APPLIED PHARMACOGNOSY 



bast fibers to form crystal fibers. The non-glandular hairs are 

 mostly unicellular. Glandular hairs of a number of specific forms 

 are developed. 



RHUS GLABRA. Sumac Berries. The fruit of Rhus glabra 

 (Fam. Anacardiacese), a smooth, glaucous shrub (Fig. 172), indigenous 

 to Canada and the United States, extending as far west as Arizona. 



Description. Drupe dry, superior, nearly globular, flattened, 

 3 to 4 mm. in diameter, 2.5 mm. in thickness, and with a slender 

 peduncle about 2 mm. in length; reddish externally, very pubescent, 

 summit with a scar and with the remains of the style, base occasionally 



FIG. 172. A fruiting specimen of Rhus glabra showing the compound leaves 

 and the long panicle of fruits, the latter, while full-grown in August, do not 

 ripen until Ocotber. 



with the 5-cleft calyx; endocarp smooth, shiny, light red; 1-locular, 

 1-seeded; seed campylotropous, dark-brown, smooth, hilum marked 

 by a distinct scar, reserve layer wanting, embryo curved; inodorous; 

 taste acidulous and astringent. 



Inner Structure. For illustration of glandular and non-glandular 

 hairs, consult Kraemer's Applied and Economic Botany, p. 280. 



Powder. Brownish-red, consisting of uniseriate, non-glandular 

 hairs, filled with a bright-red cell sap, being more or less elliptical, 

 ovoid or spatulate in outline and about 0.150 mm. in length and 0.045 

 to 0.080 mm. in width; the dividing wall is usually more or less 



