198 M. B. WELCH AND A. R. PENFOLD. 



Boronia pinnata Smith, Tracts 290, t. 4. 

 Bentham in Flora Austraiiensis, Vol, 1, page 318, (ex- 

 cluding the reference to a sexually dimorphous form with 

 a very short style bearing a thick globular stigma as large 

 or larger than the ovary) (B. floribunda). 



Anatomical characters of the leaf. 



In transverse section, the leaf (Plate XIV, fig. 1) is found 

 to be typically dorsiventral, and usually from 0*45 to 0*60 

 mm. in thickness. The palisade mesophyll is arranged in- 

 one or two layers, the larger portion of the leaf being taken 

 up by the spongy tissue. The epidermal layers are fairly 

 evenly developed, there being little difference in thickness 

 or size of cells on either side, except that the lateral walls 

 of the lower epidermis are slightly sinuate. The lateral 

 walls in both cases have simple pits. In surface view the 

 epidermal cells also show numerous small clear areas, 

 apparently due to uneven thickening of the cuticle. Oil 

 glands are not numerous in the leaves. They are directed 

 towards either surface, and possess normally four thin 

 cover cells representing the discharge mechanism. The 

 glands are typically spherical in shape, and average about 

 0*10 mm. in diameter. 



Essential Oil. 



194 lbs. weight of the branches of this plant in flower were 

 collected at Middle Harbour, Sydney, on 28th August, 1920, 

 and on distillation yielded but 20 grams of a mobile oil of 

 pleasant terpenic odour. The percentage yield being, 

 therefore, but 0*023%. A second lot of material in full 

 bloom, 150 lbs weight, was obtained from Mount Oolah, 

 Northern District, N.S.W., on 2nd September, 1921, and on 

 distillation gave 68 grams of oil, equal to 0*1%. 



The oil was quite mobile, almost colourless, with a most 

 pronounced fluorescence, usually strongly indicative of the 

 presence of the methyl ester of anthranilic acid. (The 



