NAMED RAFFLESIA. 397
not been examined, l^ut these two genera are parasitic on roots, and have also their stigmata remarkably developed ; and although Ilq//le-sia probably differs from both of them in having a superior ovarium, 1 have endeavoured to show that this ditterencc alone would not form an insuperable objection to their affinity.
��EXPLANATION OF THE PLATES RELATING TO RAFFLESIA ARNOLDI.
Plate 13 (XV.)
The expanded Flower reduced to somewhat less than ^ of its natural size; the scale given on the plate being too long by nearly f
Plate 11 (XVI). A Flower-bud covered with its bracteae, of the natural size.
Plate 15 (XVII). -33
The underside of the same Bud ; to show the root, the reticulate base with the circular elevation in which it terminates, and the origin of the outer bracteee. Natural size.
Plate 16 (XVIII).
Flower-bud, of which the bractea}, whose insertions are shown, arc re- moved. Natural size.
Plate 17 (XIX).
A different vie-w of the Bud in the same state, to show the restivation and veins of the segments of the perianthium. Natural size.
Plate 18 (XX).
Fig. 1. A vertical section of the Bud deprived of its bractero : exhibiting the principal vessels of the column and perianthium, and the structure of the root, especially the change in the direction, increased ramification and termination of its vessels at the base of the parasite. Natural size.
Fig. 2. One half of the vertically-divided perianthium of the same Bud,Jn which the internal surface of the tube, corona and segments is shown. Na- tural size.
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