INDEX OF SUBJECTS. 



733 



and of the genera composing it, 

 652-3 

 Pistillum of all Phsenogamous plants 

 considered as formed on the same 

 plan, of which a polyspermous legu- 

 men or foUiculus, ■whose seeds are 

 disposed in a double series, may be 

 taken as the type, 270 ; a circular 

 series of these pistilladisposed 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 

 Proteaces, 272 ; in Goodenovise, 

 ibid. ; in Cruciferse, ibid. ; order of 

 development of stamina and pistilla, 

 281 

 Pittosporum revolutum, arrangement 

 of nerves of the corolla in, 268 note 

 Plantse Javanicse Bariores, 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 Compositse, 

 269-70 

 Polypodium, expediency of subdividing 

 the genus, 252 ; divisions proposed, 

 565—570 

 Polytrichoideae, distinguishing charac- 

 ters of the group, 336— 341; struc- 

 ture of peristomium iu, 340 

 Polytrichum, characters of the genus, 

 336; structure of the lamella 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, 839-40 : 

 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 from Salis- 

 bury in the application of the Lin- 

 nean name, 24 — 29 ; history of the 

 genus, 25 — 29 

 Proteacese, 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- 

 meleJE,16; better called perianthium, 

 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, IS ; 

 deviations from the usual structure 

 of antherse 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, 

 23 ; chalaza always manifest, 22, 

 23 ; its nature and functions, 23 ; 

 albumen, its origin, 23 ; occasional 

 existence in Proteaceee, 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 



