266 



INDEX AND GLOSSARY 



Involucre. A circle or collection of bracts 



surrounding a flower cluster or head, or a 



single flower. 

 Involute. KoUed inward. 138. 

 Iodine, in test for starch, 9 ; preparation, 246. 

 Irregular (flower). Showing inequality in 



the size, form, or union of its similar parts. 



129. 

 Irritability, 240. 



Keel. A central dorsal ridge, like the keel of 

 a boat ; the two anterior united petals of a 

 papilionaceous flower. 183. 



Kidney-shaped. Crescentic with the ends 

 broad and rounded ; reniform. 



Labiate. Lipped ; belonging to the Labiata?, 

 133. 



Laboratory outfit, 241, 255. 



Lacerate. Irregularly cleft as if torn. 



Laciniate. Slashed ; cut into narrow pointed 

 lobes. 



Lamella. A thin flat plate or laterally flat- 

 tened ridge. 194. 



Lanceolate. Shaped hke a lance head, broad- 

 est above the base and narrowed to the 

 apex. 92. 



Lateral. Belonging to or borne on the side. 



Latex tubes, 220. 



Leaf, 71 ; activities of (Exps.), 66 ; anatomy, 

 266 ; assimilation in (Exp. 11), 66, 72 ; con- 

 duction in (Exp. 20), 69 ; form and quali- 

 ties, 72 ; heliotropism (Exp. 17), 6S ; labora- 

 tory studies, 66 ; oflice, 71 ; parts, 73 ; res- 

 piration (Exp. 12), 66 ; sleep movements 

 (Exp. IS), 68; special uses, 70; stability 

 (Exp. 21), 69 ; structure, 69 ; tendril, of 

 Cobaja, 84 ; venation, 70. 



Leaflet. A single division of a compound 

 leaf. 



Leaves, aquatic, 79, 80 ; arrangement, 89 ; 

 bladeless, 76 ; climbing, 83 ; compound, 70, 

 82, 96 ; disposition in relation to light, 74 ; 

 division, 96 ; duration, 89 ; equal illumina- 

 tion, 81 ; for storage, S3 ; insectivorous, 86 ; 

 lobing, 96 ; metamorphosed, 70 ; netted 

 veined, 7S ; palmately veined, 78 ; parallel 

 veined, 77 ; pinnately veined, 78 ; shapes, 

 78; shedding of, 89; special conformation, 

 83 ; special uses, S3 ; spinelike, S3 ; terms 

 used in description, 92. 



Legume. The fruit of the Leguminosfe, 

 formed of a simple pistil and usually dehis- 

 cent by both sutures. 150. 



Leguminous. Pertaining to a legume or to 

 the Leguminosse. 



Lepidote. Beset with small scurfy scales. 



Liber, 225. 



Lichens, 163, 196. 



Ligulate. Furnished with a ligule. 133. 



Ligule. A strap-shaped corolla, as in the 

 ray flowers of Compositse ; a thin scarious 

 projection from the summit of the sheath 

 in Grasses. 



Limb. The expanded portion of a gamo- 



petalous corolla, above the throat; the ex- 

 panded portion of any petal, or of a leaf, 



131. 

 Linear, Long and narrow, with parallel 



margins. 

 Lip, Each of the upper and lower divisions 



of a bilabiate corolla or calyx ; the pecuUar 



upper petal in Orchids. 

 Liverworts, 164, 198. 

 Lobe, Anj' segment of an organ, especially 



if rounded, 96. 

 Loculicidal. Dehiscent into the ca\ity of a 



cell through the dorsal suture. 151. 

 Loment. A legume constricted, and at 



length breaking, between the seeds. 150. 

 Longevity of trees, 63. 

 Lunate. Of the shape of a half moon or 



crescent. 

 Lycopodium, 167, 209. 

 Lyrate. Pinnatifld with a large and rounded 



terminal lobe, and the lower lobes small. 



Macrosporangiuni, 208. 



Macrospore, 20S. 



Marcescent. Withering, but persistent. 



Marchantia, 164, 19S. 



Material, illustrative, 242, 252. 



Medullary rays, 224. 



Membranaceous, Membranous. Thin and 



rather soft and more or less translucent, 

 Meniscoid. Concavo-convex. 

 Mericarp. One of the achenelike carpels of 



Umbelliferae, 

 Merous. In composition, having parts; as, 



2-merous, having two i)arts of each kind. 

 Mesophytes, 65. 

 Micropyle. The point upon the seed at 



which was the orifice of the ovule. 153. 

 Microscopes, compound, 242, 255 ; dealers 



in, 241 ; simple, 241. 

 Microsphaera, 162, 191. 

 Microsporangium, 208. 

 Microspore, 208. 



Midrib. The central or main rib of a leaf. 

 Mildews, powdery, 191. 

 Mistletoe, 41. 

 Monadeli)hous (stamens). United bj' their 



filaments into a tube or column. 134. 

 Monandrous, 135. 

 Moniliform. Eesembling a string of beads ; 



cylindrical \vith contractions at intervals. 

 Monocotyledonous. Having but one coty- 

 ledon. 

 Monocotyledons, 17 ; fibrovascular bundles 



of, 222 ; floral plan, 110 ; stem structure, 



47, 223. 

 Monoecious. With stamens and pistfls in 



separate flowers on the same plant. 119, 



129. 

 Morphology, 14. 

 Mosses, 202. 

 Movements, 239 ; due to change of turgidity, 



240 ; induced, 240 ; spontaneous, 240i 

 Mucilaginous, Slimy ; containing mucilage, 

 Mucro. A short and small, abrupt tip. 



