may be recognized on the basis of the origin and nature 
of the vascular supply to the staminal and_ stigmatic 
whorls, rather than on the method of vascular supply to 
the perianth. 
Tyre L. (Seen in the members of Cypripedilinae; Fig. 
4 A, B and C). The traces to the median and lateral 
stigmas (G1, G2, G8) are the first to be separated. As 
can be expected, they arise from the main traces, DS 
and the two LS, underlying the median and lateral sepals 
respectively. At a slightly higher level, the same main 
traces trifurcate, to constitute the median and marginal 
traces of the respective perianth member. Further, the 
marginal traces of these sepal members supply the mar- 
ginal traces to the petals also (Fig. 4 A). The main trace, 
DS, gives rise to another small trace (A1) at a slightly 
higher level ; this trace runs vertically into the staminode. 
The main traces occupying positions under the lateral 
perianth lobes of the inner whorl, after giving out the 
traces to the functional stamens (al and a2), merely pass 
into the respective petal as its median trace. The mar- 
ginal traces of these, as has been stated, are derived from 
branches of marginal traces of the sepal members. ‘The 
main trace, MP, does not split up but continues into the 
labellum as its median trace. 
The following points may be especially noted in this 
connection: 
1. Masters (1887) observed in some species of Cypri- 
pedium that the trace underlying the labellum also tri- 
furcated to form the median and marginal traces of that 
petal. However, the flowers here examined do not show 
this feature. The marginals of the labellum are always 
given out by the marginal veins from its adjacent sepal 
members. 
[ 70 | 
