VEGETABLE IRRITANTS. 39 



RHEUM PALMATUM (CAina and Thibet). 



TURKEY RHUBARB— MEDICINAL RHUBARB— PALMATE-LEAVED 

 RHUBARB — SHARA-MOTO — DJUNTSA. 



PolygonacecB. — Root with a vertical axis ift. long, and equally 

 thick ; many slender rootlets 2ft. long. — Flowering-stem 7-ioft. ; 

 cylindrical ; hollow ; striate ; red. — Leaves at root on petioles 

 2ft. long ; 5 lobed ; deeply and unequally serrate ; stem-leaves 

 becoming smaller. — Flowers numerous ; on spreading pedi- 

 cels ; 2-3 together on branchlets of panicle, which come off in 

 tufts at each joint. — Fruit triangular in section ; winged.^ 

 Perenn. ; June ; white. (This plant has no poisonous properties 

 under home cultivation). 



Toxic principles.— 'RHE.Q-TKlAmC ACID, CHRYSAROBIN ; 

 also contained in R. compactum, R. undulatum, R. auBtpale. 



CASSIA LANCEOLATA. CASSIA SENNA 



{North Africa). 



ALEXANDRIAN SENNA — .NUBIAN SENNA. 



Lei^umiftoscB. — Shrub ; 2ft. — Stem erect ; pale green. — 

 Branches angular. — Leaves alternate; spreading; leaflets in 

 pairs ; shortly stalked ; lanceolate. — Flowers orange. — Pod 

 broadly oblong ; 2 by lin. ; stalked.- -Seeds 6 ; obovate- wedge- 

 shaped. 



Toxic principle.—CkTHKRTlC ACID. 



ARNICA MONTANA {Mid. and South Europe). 



MEDICINAL LEOPARD'S-BANE— MOUNTAIN TOBACCO- 

 MOUNTAIN ALK.ANET. 



Composites. — Rhizome black ; 2in. — Flowering stem gin. ; 

 erect ; cylindrical. — Leaves opposite ; few ; sessile ; oblong- 

 ovate ; entire. — Flower-heads solitary on summit of stem, or, 

 rarely, by lateral branches. — Fruit linear, oblong ; striate. — 

 Glaucous. — Perenn.; June and July ; yellow. 



Toxic principle.— Mimcm. 



