VASCULAR SYSTEMS OF FLORAL ORGANS. 173 
of each pair of U’s or V’s have coalesced they form a thin broken 
line of black dots in a radial direction (18), while here and there 
a stray trachea appears in an isolated position; but there is 
nothing at all, as it seems to me, to justify the description given 
above. Hence I regard the axis as totally wanting, and the 
central axial column as entirely due to the hypertrophied 
margins, just as in Pelargonium. 
VII. MALVACEZ (Pl. XXV.).—xir. MALVA SYLVESTRIS 
and M. moscuata.—There are five cords in the pedicel of the 
Common and Musk Mallows (1). These increase till a complete 
circle is formed (2), from which three are given off for the epicalyx 
(2, ep.c.) and several to each sepal. Above the calyx five quite 
separate and large cords are formed, with the tracheæ some- 
what irregularly disposed within the phloém (3). They become 
united, when each breaks up into five (4,5). The outermost is 
a petaline (p.), the next two are staminal (s¢.), and the innermost 
pair (c.) are carpellary (5). 
The petaline cord first divides into three (6, p.) by radial 
chorisis, then into five, or even seven may be produced. The ten 
staminal cords now pass up the filamental column, five arranging 
themselves exactly opposite the petals and five alternating with 
them, and therefore opposite to the sepals (7). The former now 
divide by tangential chorisis into two (8); subsequently a third 
is given off, while the sepaline now divide into two (9). The 
others repeat the process, so that thirty antheriferous filaments 
are finally produced. Figure 10 shows how the original cord 
divides into a pair. Ph. van Tieghem described Abutilon pictum: 
the process is much the same, only each staminal cord gives rise 
to six antheriferous branches; so there will be sixty in all *. 
The carpellary cords early spread away, and together form a 
regular circle of ten cords (6, c.) at least. Each of these divides 
into three, a central cord passing off to become a dorsal car- 
pellary (11, d.e.); while one supplies a cord to the single ovule, 
the other ultimately stands in front of a septum (11). 
VIII. HYPERICINEÆ (Pl. XXVL).—xıv. HYPERICUM An- 
DROSEMUM.—In this species there are five phalanges of stamens, 
each of which is more easily detected, as being of double origin, 
than are those of species having three phalanges only. 
* Recherches sur la Structure du Pistil, p. 30, pl. ix. figs. 5-9. 
