650 



INDEX. 



Populus italica, crystals, 140. 



Popnlus monilifera, 472, 

 492. 



Populus nigra, 558. 



Populus pyramidalis, 471, 

 472, 479. 498, 528, 558. 



Populus tremula, 492, 498, 

 5S8. 



Pore, 34. 



Pores, air, 45 ; in Pleuro- 

 thallideae, 54 ; on prickles 

 of Victoria, 54 ; water, 

 50. 



Porlieria, 485 : bast-fibres, 

 526; ligneous bundle, 495. 



Porlieria hygrometrica, 479 : 

 crystals, 530. 



Portulaca oleracea, 236. 



Posidonia Caulini, 2^7. 



PotamesE, 10, 141 : hairs, 

 56. 



Potamogeton, 67, 407 : air- 

 spaces, 213, 215, 217; 

 endoderrais, 121, 123, 

 124; lime scales, 107; 

 sclerenchyma, 420, 425 ; 

 sieve-tubes, 232 ; stomata, 

 46 ; vascular system, 270, 

 302, 304, 312, 367, 368, 

 370, 391, 392. 



Potamogeton crispus, 123, 

 368, 392, 425 : vascular 

 system, 272, 274 (Figs. 

 124, 125). 



Potamogeton densus, 123, 

 272, 368, 425. 



Potamogeton gramineus, 



123, 271, 274, 425. 

 Potamogeton lucens, epi- 

 dermis, 80, 124, 232, 271, 

 274, 312, 352, 368, 370. 



Potamogeton natans, 107, 



124, 125, 232 : sieve- 

 tubes, 173; vascular bun- 

 dles, 368 (Fig. 170); 312, 

 367; vascular system, 270, 

 271, 272 (Figs. 121, 122). • 



Potamogeton pectinatus, 

 124, 232: vascular bun- 

 dles, 271, 277, 312, 369 

 (Fig. 171); vascular sys- 

 tem, 273 (Fig. 123). 



Potamogeton perfoliatus, 

 271, 367, 423. 



Potamogeton praelongus, 

 124. 



Potamogeton pusillus, 272, 

 277, 312, 368. 



Potentilla aurea, stomata, 

 48. 



Potentilla fruticosa, ligneous 

 bundle, 495. 



Potentilla Thuringlana, 

 water-pore, 52. 



Pothos, vascular system, 

 304. 



Pothos argyrea, crystals, 

 140 ; stomata, 40. 



Pothos crassinervia, crys- 

 tals, 140; stomata, 40. 



Pothos Rumphii, internal 

 hairs, 222. 



Pouroumaguyanensis, hairs, 



65. 



Prickles, S5, 66. 



Primula, dusty hairs, 99, 

 100 ; secretion, 98 ; sto- 

 mata, 37; vascular sys- 

 tem, 250, 251, 252; 

 water-pores, 51. 



Primula acaulis, water-pore, 



51- 



Primula Auricula, 25, g^ : 

 endodermis 124 (Fig.51); 

 vascular system, 250, 231, 

 254 5 'water-pore, 51. 



Primula calycina, 252. 



Primula elatior, 252. 



Primula farinosa, 99, 252. 



Primula marginata, gg, 252 : 

 water-pore, 51. 



Primula sinensis, 99, 122, 

 252, 303: end of vascular 

 bundle, 375 (Figs. 177, 

 178) ; glandular-hairs, 89 

 (Figs. 31-34), 93 ; water- 

 •pore, 51. 



Primula spectabilis, 252. 



Primulaceae, 12, 23: endo- 

 dermis, 122, 415. 



Prinos, pith, 403. 



Procambium, 389. 



Prosenchyma, 27. 



Proteacese, 71, 77, 497: 

 fibres, 130; parenchyma, 

 408; sclerenchyma, 424; 

 stomata, 35, 37, 39) 4°- 



Protective sheath, 121. 



Protogenetic, 200. 



Protophloem, 324, 343. 



Protoplasm, 66. 



Protoxylem, 321. 



Prumnopitys elegans, epi- 

 dermis, 78. 



Prunus, 339: cork, no; 

 crystals, 330; glands, 90, 

 96 ; medullary rays, 493 ; 

 periderm, 348; secondary 

 changes, 479 ; tracheides 

 and fibres, 483 ; vascular 

 system, 297, 377. 



Prunus avium, 493, 330, 

 543 : lentlcels, 562, 363 ; 

 vascular system, 239. 



Prunus Cerasus, no: lenti- 

 cels, 364. 



Prunus domestica, 479, 509 : 

 lenticels, 566; stomata,48. 



Prunus Laurocerasus, 377, 

 479 : gelatinous layer, 

 482 ; glandular hairs, 90, 



96 ; secretion, 98. 

 Prunus Mahaleb, stomata, 



48. 



Prunus Padus, crystals, 142, 

 530 ; mucilage, 74; water- 

 pores, 51. 



Prunus spinosa, 493, 509. 



Pseudolarix Kaempferi, 443. 



Pseudotsuga, medullary 

 rays, 490. 



Psilotum, 22: raeristematic 

 apex, 22 ; sclerenchyma, 

 429; stomata, 35; vas- 

 cular system, 280. 



Psilotum triquetrum, epi- 

 dermis, 77 ; vascular sys- 

 tem, 279, 280. 



Psoralea, glands, 91, 92, 

 93- 



Psoralea bituminosa, glands, 

 92 ; vascular bundles, 392 

 (Figs. 172, 173) ; vascular 

 system, 303 (Fig. 146). 



Psoralea hirta, glands, 92, 



97 (Fig. 42), 135. 

 Psoralea pinnata, 92. 

 Psoralea stricta, 92. 

 Psoralea verrucosa, 92. 

 Ptelea trifoliata, crystals, 



142. 



Pteris, 118, 403 : vascular 

 system, 284, 289. 



Pteris aquilina, 15, 161, 167, 

 168: bordered pits, 162 

 (Fig. 61); sclerenchyma, 

 132 (Fig.34), 427; sclero- 

 tic cells, 121 (Fig. 48); 

 sieve-tubes, 181 (Fig. 79}; 

 vascular bundle, 344 (Fig. 

 161); vascular system, 

 293 (Fig. 143), 314, 342, 

 343 ; vessels, 165. 



Pteris aurata, dusty hairs, 



99- 

 Pteris aurita, 284. 

 - Pteris cretica, stomata, 



41. 

 Pteris elata, v. Karsteniana, 



289. 

 Pteris flabellata, stomata, 41 



(Fig. 14). 

 Pteris gigantea, 289. 

 Pteris hastata, root apex, 



18 (Fig. 8). 

 Pteris orizabae, 289. 

 Pteris pinnata, 427. j 



Pteris podophylla, 289. '' 

 Pteris Vespertilio, 284. 

 Pterocarpus santalinus, 487 : 



crystals, 141 ; sap-wood, 



508. 



