564 



BOTANY OF THE LIVING PLANT 



Lamium, mechanical construction of 



stem of, 151, 152 (Fig. no) ; 



L. album (Dead-Nettie), 533 (Fig. 



438). 

 Land-Habit, 479, Chap, xxxii. 

 Land Plants, internal embryology of, 



463, Chap, xxxii. 

 Lantana, straggling habit of, 180 



(Fig. 134, iii) ; spread by birds in 



Ceylon, 295. 

 Lastrsea pseudo-mas : chromosomes 



of, 348 ; apogamyin, 350 (Fig. 294, 



295) ; V. cristata, 482. 

 Latent period, 297 ; obligatory, 298. 

 Lateral geotropism, of twining stems, 



182. 

 Lateral roots, origin of, 79 (Fig. 62). 

 Latex-cells, of Euphorbiaceae, 141. 

 Latex vessels, of Cichoriacae, 141. 

 Lathraea, parasitism of, 193 (Fig. 



144)- 



Lathyrus aphaca, correlation in leaf, 

 185 (Fig. 139). 



Latticed girders, 148, 152. 



Layering, 215 (Fig. 163). 



Leaf, definition of, 58 ; structure of. 

 Chap. iv. ; structure suited to func- 

 tion, 69 ; arrangement, whorled or 

 cyclic, 168 ; alternate, 169 ; fall, 

 68 (Fig. 52), 162. 



Leaf-mosaic, the fitting of the leaves 

 together, so as to fully occupy 

 space exposed to light without 

 overlapping, 168 (Fig. 127), 173 

 (Fig. 129 bis.). 



Leaf-mould, source of saprophytic 

 nourishment, 188. 



Leaf-scar, surface of separation of 

 leaf from axis, 13 (Fig. 6). 69 (Fig. 



Leaf-trace, in Ferns, 330. 



Legume or Pod, a separate carpel, 



splitting along both margins and 



midrib, and containing several 



seeds, 285, 287. 

 Legumes, analysis of, 542. 

 Leguminales, 493, 522. 

 Leguminosae, climbing habit of, 180 ; 



tubercles of, 106, 204 ; flowers of, 



522 (Fig. 431). 

 Lemanca, 388. 

 Lcmna, movement of chloroplasts 



m, 67 (Fig. 51). 

 Lenticels, breathing pores through 



corky covering of a stem or root, 



13 (Fig. C), 55 (Fig. 41), 56, 69 (Fig. 



Lentil (Ervum lens), analysis of, 542, 



origin of, 543. 

 Lepidocarpon, seed-like organ of, 



324- 

 Leptom, of Mosses, 357 (Fig. 299), 



37°- 



Lettuce (Lactuca scariola) , high water- 

 content of, 141 ; analysis of, 54: ; 

 origin of, 542. 



Leucobryum, 35S. 



Leucojum, 495. 



Leukocytes, white blood-corpuscles 

 of the animal body, 203. 



Leukoplasts, or starch-forming cor- 

 puscles, no (Figs. 79, 81). 



Lianes, woody climbers of large size, 

 iSo. 



Lichens, symbiosis of, compared with 

 mj'corhiza, 203 ; description of, 

 438. 454 (Figs. 372, 373) ; Fission- 

 Algae a constituent of, 457. 



Life, indications of, 24. 



Lite-cycle of Flowering Plants, 299 

 (Fig. 244) ; of Ferns, 347 (Fig. 

 291) ; of Bryophytes, 368 ; of 

 Fungi, 409. 



Light, necessary for photo-synthesis, 

 gS : local effect of, loi (Fig. 74) ; 

 source of energy, 104 ; retarding 

 influence on growth, 122 ; effect 

 on growing organs, 127. 



Lignified walls, of woody character, 28. 



Ligulatae, 318. 



Ligulatc florets, of Compositae, 535, 

 538 (Fig. 444). 



Ligulc of Selaginclla, 319 (Figs. 

 360, 361, 362) ; of Lychnis, 507 

 (Fig. 412). 



Liguliflorae, 535, 538. 



Liliaceae meristic differences in, 

 231 ; 492, 494. 



Liliales, 492 ; 493 (Fig. 397). 



Lilium, origin of embryo sac in, 261 ; 

 fertilisation in, 271 (Fig. 215) : 

 272 (Fig. 216) ; 494 (Fig. 398). 



Lily, bulbils of, 213 ; syncarpous 

 pistil of, 253 (Figs. 199, 201) ; 

 stigma of, 250 ; of the valley, 495. 



Lime, products of cambium of, 50 

 (Fig. 37) ; bast of. 53 ; leaf- 

 mosaic of, 173 (Fig. 129 bis) ; 

 dorsivcntrality of, 173. 



Limit of elasticity ; measured by the 

 greatest burden per unit of trans- 

 verse section which can be sup- 

 ported without losing the power 

 of perfect recovery : 146, 147. 



