338 



1906; Staunton Springs, near Pingelly, Rogers, 26/9/19; 

 Ravenswood, Pinjarra., Darling Ranges, Albany District, 

 Rogers, September and October, 1919. 



This species bears a close resemblance in its habit to 

 P. ovale, Lindl. Apparently the only constant distinction is 

 to bo found in the labellum. In Bentham's species the 

 labellum is not relatively broad in proportion to its length; 

 its base is very distinctly gibbous and protrudes between the 

 lateral sepals; it is erect in its lower two-thirds, gradually 

 narrowing upwards to the bend where it contracts and then, 

 once more expanding, recurves forward in its distal third into 

 an undulate tip. In Lindley's species the labellum is oval in 

 shape and more spreading than in P. cyphochilum', it is not 

 at all gibbous and its base does not protrude between the 

 sepals in the pressed specimen; it is relatively very wide in 

 proportion to its length ; it gradually curves forward from base 

 to tip, and it has no point of lateral contraction as in P. 

 cyphochilum. 



The segments of the perianth are subequal, about 5 mm. 

 long, and are generally shortly acute, but may be almost 

 blunt; they are relatively narrower and rather longer than 

 in P. ovale. 



The flowers are generally yellowish or whitish-green with 

 chocolate stripes down the centre of the segments. The plant 

 is slender but may attain the height of 60 cm. 



P. ovale, Lindl. 



Western Australia : Cut Hill, near York, O. H. Sargent, 

 October, 1905; Perth, Dr. J. B. Cleland; Albany District, A. 

 ;G. Hamilton; Swan View, Mrs. W. E. Cooke, 13/9/07; 

 Gosnells, Mrs. W. E. Cooke, 4/10/08; Lake Chockerup, 

 Rogers, 21/9/19; Woogenellup, Rogers, 23/9/19. 



Flowers small, white, often with purple stripes down the 

 centre of the perianth segments; latter nearly equal in length, 

 about 4 mm. long, the lateral petals being a little shorter, 

 generally very blunt (almost truncate). Lateral sepals 

 commonly quite free and , not gibbous, in Drummond's 

 specimens shortly connate at the base, broadly linear, slightly 

 expanded about the middle. Dorsal sepal white, wider than 

 the other segments, cucuUate, erect or sometimes reflexed. 

 Lateral petals slightly narrower than sepals, not expanded in 

 the middle. 



Labellum nearly as long as the lateral sepals, sessile, oval 

 or broadly elliptical, membranous part white, wide, with 

 entire margins slightly crenulated towards the tip; callous 

 part smooth, green, triangular, extending from the base to 



