SEEDLING STRUCTURE IN THE LEGUMINOS. 19 
about half-way up the hypocotyl. The phloem remains in four prominent 
rounded groups throughout, fibres being present in its tissues in the lower 
part of the hypocotyl. About 5 mm. below the cotyledons each polar triad 
is in the form of a small median protoxylem and a pair of collateral bundles : 
the lateral xylems being much spread out tangentially, and dividing to join 
the polar groups. Just below the cotyledons the lateral half-xylems join the 
polar collateral bundles : so that each cotyledon receives a pair of collateral, 
more or less endarch, bundles and a tiny median protoxylem. 
The structure agrees in the main with that described in Bauhinia 
tomentosa. 
ACROCARPUS FRAXINIFOLIUs, Wight & Arn. 
Hypocotyl narrowing gradually to the root.  Cotyledons ovate. 
The single seedling examined differed chiefly from Parkinsonia aculeata in 
the fact that the phloem begins to divide at the collet, with the production of 
eight strands, whieh continue up the hypocotyl to just below the cotyledons, 
where they again fuse in pairs. Each cotyledon receives a minute polar 
protoxylem and four bundles of xylem derived from the polar metaxylems 
and the lateral root xylems in the usual way, Thus the diameter, superior to 
that in P. aculeata, allows of a greater spreading-out of the vascular system 
than in that species. 
CUESALPINIA CORIARIA, Willd, 
A small shrub. Hypocotyl uniform, save for а slight swelling just above 
the collet. Cotyledons ovate, stalked, almost sagittate at the base. 
Similar on the whole to Parkinsonia aculeata, but the polar xylems never 
spread out sufficiently to become triads ; they divide, with their protoxylems, 
just below the cotyledonary node, and join the lateral half-xylems. The 
phloem remains throughout in four groups. Thus the cotyledon trace con- 
sists of a pair of collateral bundles ; no polar protoxylem was observed. 
C.ESALPINIA PULCHERRIMA, 10. 
A shrub or small tree. The hypocotyl tapers gradually to a long primary 
root. Just above е external collet is a slightly protruding ring of cortical 
tissue only. Тһе cotyledons are oblong, rather broader distally, shortly 
stalked, and auricled at the base, caducous. De Candolle (1825, pl. 23) 
gives a figure of the seedling under the name Poinciana pulcherrima. 
The root is tetrarch. Pith is present throughout. 2 mm. below the collet 
we find four broad exarch wedge-shaped masses of primary xylem situated 
around a large pith and alternating with four scarcely fibrous arcs of phloem. 
Just above the collet the structure is the same except that bands of fibres lie 
outside the phloem arcs, and appear to be pericyclic in nature, though this is 
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