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. 

 Lastraea 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. 



52). 

 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). 

 Lemanea, 388. 

 Lemna, movement of chloroplasts 



in, 67 (Fig. 51). 

 Lenticels, breathing pores through 



corky covering of a stem or root, 



13 (Fig. 6), 55 (Fig. 41), 56, 69 (Fig. 



52). 



Lentil (Ervum lens), analysis of, 542, 



origin of, 543. 

 Lepidocarpon, seed-Uke organ of, 



324- 

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



370- 



Lettuce (Lactuca scariola) , high water- 

 content of, 141 ; analysis of, 541 ; 

 origin of, 542. 



Leucobryum, 358. 



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, 

 180. 



Lichens, symbiosis of, compared with 

 mycorhiza, 203 ; description of, 

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

 Algae a constituent of, 457. 



Life, indications of, 24. 



Life-cycle of Flowering Plants, 299 

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

 291) ; of Bryophytes, 368 ; of 

 Fungi, 409, 



Light, necessary for photo-synthesis, 

 98 ; 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. 



Ligulate florets, of Compositae, 535, 

 538 (Fig. 444). 



Ligule of Selaginella, 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, 256 ; of the valley, 495. 



Lime, products of cambium of, 50 

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

 mosaic of, 173 (Fig. 129 bis) ; 

 dorsiventrality 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. 



