266 



INDEX AND GLOSSARY 



Involucre. A circle or collection of bracts 



surroundiug a flower cluster or head, or a 



single flower. 



Involute. Eolled 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. 133. 



Kidney-shaped. Crescentic with the ends 

 broad and rounded ; reniform. 



Labiate. Lipped ; belonging to the Labiatae. 

 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 like 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), 68 ; labora- 

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

 piration (Exp. 12), 66; sleep movements 

 (Exp. 18), 68; special uses, 70; stability 

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

 Cobsea, 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, 83 ; insectivorous, 86 ; 

 lobing, 96; metamorphosed, 70; netted 

 veined, 78 ; palmately veined, 78 ; parallel 

 veined, 77 ; pinnately veined, 78 ; shapes, 

 78; shedding of, 89; special conformation, 

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

 used in description, 92. 



Legume. The fruit of the Leguminosae, 

 formed of a simple pistil and usually dehis- 

 cent by both sutures. 150. 



Leguminous. Pertaining to a legume or to 

 the Leguminosae. 



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 Composita? ; 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 peculiar 



upper petal in Orchids. 

 Liverworts, 1(54, 198. 

 Lobe. Any segment of an organ, especially 



if rounded. 96. 

 Loculicidal. Dehiscent into the cavity 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. Pinnatifid with a large and rounded 



terminal lobe, and the lower lobes small. 



Macrosporangium, 208. 



Macrospore, 208^ 



Marcescent. Withering, but persistent. 



Marchantia, 164, 198. 



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 parts 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. 

 Monadelphous (stamens). United by their 



filaments into a tube or column. 134. 

 Monandrous, 135. 

 Moniliform. Kesembling a string of beads ; 



cylindrical with 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 pistils in 



separate flowers on the same plant. 119, 



129. 



Morphology, 14. 

 Mosses, 202. 

 Movements, 239 ; due to change of turgidity, 



240 ; induced, 240 ; spontaneous. 240. 

 Mucilaginous, Slimy ; containing mucilage. 

 M ucro. A short and small, abrupt tip. 



