SEEDLING STRUCTURE IN THE LEGUMINOS& Ж, 51 
opposite, however, and there is nowhere any trace of a tetrarch symmetry. 
The doubie bundles are organised in the usual way, but the collateral 
bundles of each are markedly asymmetrical : the one on the side of, and 
partially derived from, the third (intereotyledonary) root-pole is much 
larger than the other. The cotyledons are inserted at less than 180° apart, 
and their less curved edges are on the side of the third root protoxylem. 
This is the side on which the first plumular leaf appears ; and its trace 
is represented in the hypocotyl by secondary vascular tissue overlying, but 
distinct from, the third primary xylem. 
HIPPOCREPIS Comosa, Linn. 
A sprawling perennial with a woody root-stock. The cotyledons are almost 
linear, broadening slightly towards the tips. 
The root contains a solid triarch xylem star; the phloems contain fibres, 
which are present in considerable quantity throughout the seedling ; in 
the hypoeotyl, in addition to the phloem fibres, a group of fibres appears 
opposite each of the three protoxylems and the position of the missing fourth. 
The vaseular tissues are rearranged half-way up the hypocotyl, as if becoming 
tetrarch, the phloem between the two polar xylems dividing; but no fourth 
protoxylem appears. Each cotyledon receives one and a half root xylems ; 
the groups of fibres outside the polar protoxylems are confined to the 
hypocotyl and die out below the node. The transition is typically high. 
CORONILLA VARIA, Linn. 
A diffuse herbaceous perennial. The cotyledons are lanceolate. 
The root is triarch ; the xylem being solid to the centre, which is usually 
occupied by a large pitted vessel. The phloem contains fibres. Root- 
structure continues unchanged through three-quarters of the hypocotyl. 
A pith then appears and two of the protoxylems become opposite, the third 
being placed 90° from them, No trace of a fourth protoxylem was found at 
any level. At the cotyledonary node each double bundle consists of a pair 
of xylems with a polar protoxylem, between and two phloems obliquely dorsal 
to them. 
The epicotyl consists at first of two stems, each with its own leaf-system, 
borne without special relation to the position of the cotyledons. This behaviour 
does not affect the primary structure of the hypocotyl. Similar features are 
found in other Hedysarez, e. р. Scorpiurus vermiculatus. 
DALBERGIE/E. 
DALBERGIA Sissoo, Row), 
An erect tree. Hypocotyl narrowing gradually to the root. Cotyledons 
ovate. 
The root is tetrarch, containing a solid and almost square xylem. A pith 
appears some distance below the collet, and the xylem, at first annular, 
E2 
