192 REV. PROF. G. HENSLOW ON THE 
corner of the triangle for each bract (3*). The three pairs of 
cords remaining are destined for the three pedicels (3*, ped.). 
These then appear as in (4). The three circular cords in the 
middle are destined for the central pedicel (3*, e.ped.). 
Following out the course of the cords in one of the pedicels, 
the ring throws off five eords for the involucral cup (4, inv.), 
retaining a central ring by closing up. The former cords break 
up into clusters (5), each of which supplies a stamen with its 
cord. The stamen sooner or later frees itself from the common 
tissue of the involuere (7); so that vertical sections show how 
the staminal branches arise by chorisis in any direction (8, 9). 
Although the circular tissue of the stamen has an articulation 
(10, art.), the cord itself runs uninterruptedly through it up te 
the anther. 
The central ring which supplies the pistil forms three distinct 
cords, each of which divides into a triple cluster (11) : one, the 
middle cord, forming the dorsal carpellary (d.), the others, the 
marginal or placentary (pl.). Although the latter are somewhat 
oriented as if axial (12), that is with the trachez facing the 
medulla, yet the presence of the dorsal cord, with the base of the 
ovary-cell visible, proves that they should be regarded as mar- 
ginal and placentary or foliar appendages, and are not axial in 
character. 
Fig. 6 represents a so-called bract from the base of the invo- 
lueral cup. It resembles rather a fern-scale or a paleacvous 
pappus of a Composite, as of Galinsoga; for it possesses no cords 
whatever. 
Litt, Buxus SEMPERVIRENS.—The female flower has a tri- 
angular arrangement of cords below the pistil (1), as in Rheum 
(2.2). The corners send off the dorsal cords (d.), while the rest 
form three cords with the tracheæ facing the medulla (3), just as 
in Euphorbia (utr. 12). The cavities now appear (4), and the 
tracheæ quickly lose their « axial” orientation and become 
central (5, 6). 
The pedicel of the male flower has 
a complete ring. This 
throws off two pairs of cords sue 
cessively for the four sepals 
(7 & 8, s.), and for the stamens (9, st.) Superposed to them; 
the remaining cords now pass upwards for a short distance, 
and, branching, terminate in fine points at the base of a 
quadrangular fleshy disk (D), which occupies the middle of the 
flower (9), 
