INDEX OF SUBJECTS.
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��and of the genera composing it, 652-3
Pistillum of all Phaenogamous plants considered as formed on the same plan, of which a polyspermous legu- men or folliculus, whose seeds are disposed in a double series, may be taken as the type, 270 ; a circular series of these pistilla disposed round an imaginary axis, and whose num- ber corresponds with that of the parts of the calyx or corolla, enters into the author's notion of a flower complete in its parts, ibid. ; devia- tions from this type and number, how accounted for, ibid. ; the type and its reduction in the family of Proteaceae, 272 ; in Goodenoviaa, ibid. ; in Cruciferae, ibid. ; order of development of stamina and pistilla, 281
Pittosporum revolutum, arrangement of nerves of the corolla in, 268 note
Plantar Javanicae Rariores, extracts from, 557, &c
Plantago, an exception to the ordinary rule of development of stamina and pistilla, 281
Podocarya, a fossil fruit referrible to Pandaneae, observations on, 717-8
Pollen, importance of its figure in fixing our notions of the limits of genera, 19 ; form of, in Compositae, 269-70
Polypodium, expediency of subdividing the genus, 252 ; divisions proposed, 565—570
Polytrichoidese, distinguishing charac- ters of the group, 336 — 311 ; struc- ture of peristomium in, 340
Polytrichum, characters of the genus, 336 ; structure of the lamellae in, ibid. ; form and position of male flowers in, 337 ; double calyptra of, ibid. ; teeth of peristomium in, ibid. ; transverse membrane of tym- panum in, ibid. ; various forms of capsule in, 338 ; inner membrane of capsule in, ibid.; inner peristo- mium of, 339 ; columella of, 339-40 : seeds of, 340.
Portlandia, arrangement of the nerves of the corolla in, 268
Poterium, order of expansion of flowers
��and position of female flowers in its spike, 279
Protea, reasons for differing 1 from Salis- bury in the application of the Lin- nean name, 24 — 29 ; history of the genus, 25—29
Proteaceae, on the natural order of, 3 ; remarks on its geographical distri- bution, 9 ; almost entirely confined to the southern hemisphere, 9 ; occurs in the greatest abundance and variety in Southern Africa and New Holland, 10 ; its distribution in New Holland, 10 — 12; stations and elevations at which its species are found, 13 ; pubescence of, 14 ; disposition of, 14, 15 ; form and division of leaves, 15 ; inflorescence of, ibid. ; calyx of, why so consi- dered, 15, 16; identity of calyx with the organ so called in Thy- meleae,16; bettercalledperianthium, or perigonium, ibid.; invariably divided into four leaves or segments, ibid. ; aestivation of, 16, 17 ; its colour useful in indicating genera, 17 ; scales surrounding the ovarium, their use, importance, and number, ibid. ; varieties in structure, or apparent origin of stamina, 17, 18 ; deviations from the usual structure of antherae in, 18 ; figure of the pollen in, 19 ; its importance in fixing the limits of genera, ibid. ; internal structure of the ovarium of the greatest importance, 19, 20; number and insertion of ovula, 20 ; position of radicle, ibid.; form of style, ibid. ; form and direction of stigma, 20, 21; nature of fruit, 21, 22 ; its varieties in the order, 22; chalaza always manifest, 22, 23 ; its nature and functions, 23 ; albumen, its origin, 23 ; occasional existence in Proteaceae, ibid. ; radi- cula always points towards the base of the fruit, 23, 24 ; plumula incon- spicuous in the whole order, 24; cotyledons, when more than two of little importance, 24; genera formed before the publication of Salisbury's arrangement of the family, 24; reasons for differing from Salisbury in the application of the Linnean
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