March, 1935. 
The Queensland Naturalist. 
63 
due to natural hybridization between D. speciosum and 
D. Kingianum; and these putative parents being present 
in both localities, hybridization may easily have occurred 
independently with slightly different results. It may be 
urged that I have used the different conditions at Too- 
woomba and Bullahdelah as an argument against identity, 
while admitting that no such argument applies to D. 
speciosum and D. Kingianum. This is true ; but whereas 
the two latter species occur over the whole area between 
the two localities, neither D. delicatum nor I). Kestevenii 
has been seen there. Under the circumstances, and in view 
of the differences set out below, I think we are justified 
in keeping the two species separate. 
J). delicatum. 
Stems pale, fairly numerous, 
slender except for the lowest 
third , fluted. 
Dimensions of longest stem 
measured : Length, 36 cm. 
Diameter near base, 2\ cm., 
half-way, 11 mm., near top, 
10 mm. 
Leaves longer and relative- 
ly narrower (longest 
measured, 19J x 3^ cm), 
hardly recurved, dull. 
Axis of raceme rather dark 
green, weak and drooping 
with weight of flowers, the 
longest one seen 24 cm. 
First flower of plant in cul- 
tivation 1934, opened 
Sept. 13. 
Buds deeply suffused with 
purplish-red, the colour be- 
coming lighter as the flowers 
mature, but not disappear- 
ing. 
Number of flowers observed 
on racemes 7 to 14. 
Flowers slightly smaller, 
segments broader but more 
acute. 
Disc of labellum with 3 
longitudinal plates united 
for almost their whole 
I). Kestevenii. 
Stems darker green, very 
numerous and crowded, 
robust but narrowing near 
the top f fluted. 
Corresponding dimensions : 
23 i cm., 2\ cm., 20mm., 10 
mm. 
Longest leaf measured, 17 x 
4 cm. Leaves recurved, 
moderately glossy. 
Axis of raceme very pale, 
strong and erect , the longest 
30 cm. (This measurement 
is not uncommon.) 
First flower under exactly 
similar conditions, 1934, 
opened Aug. 28. 
Buds often delicately tinted 
pink, the colour disappear- 
ing as the flowers mature, 
except sometimes on the 
petals. 
Number of flowers 6 to 23. 
Disc of labellum with 3 
similar plates which gradu- 
ally sink to the level of the 
labellum and fuse along 
the mid-lobe. 
Mid-lobe very 
concave 
