_Castalia_, 189. Castor-bean, 200. Catalpa, 218. Cat-brier, 154. Catkin, 181. Catnip, 215. Cat-tail, 159. Cedar apple, Cedar rust. See "_Gymnosporangium_." _Celastraceæ_, 199. _Celastrus_. See "Bitter-sweet." Celery, 3. Cell, 6. apical, 38, 96, 105, 115. division, 23, 31, 229. row, 8; Fig. 3. mass, 8; Fig. 4. sap, 6, 151. Cellulose, 3. Centaury, 219. _Centrospermæ_, 183. _Cephalanthus_. See "Button-bush." _Cerastium_. See "Chick-weed." _Ceratophyllum_. See "Horned pond-weed." _Cercis_. See "Red-bud." _Chamærops_. See "Palmetto." _Chara_, 38-40; Fig. 23. general structure, 38. method of growth, 39. cortex, 39. non-sexual reproduction, 39. oögonium, 39. antheridium, 39, 40. spermatozoids, 40. germination, 40. _Characeæ_, 21, 37, 40. _Chareæ_, 40. _Cheiranthus_. See "Wall-flower." _Chenopodium_, _-aceæ_. See "Goose-foot." Cherry, 15, 206; Fig. 114. Chicory, 223. Chick-weed, 185; Fig. 98. _Chimaphila_. See "Prince's pine." _Chionanthus_. See "Fringe-tree." Chlorine, 2. _Chlorococcum_, 23; Fig. 12. Chloroform, 234. Chloroplast, 22, 45. Chlorophyll, 15. Chlorophyll body. See "Chloroplast." _Chlorophyceæ_, 21. _Chondrus_. See "Irish moss." _Choripetalæ_, 181, 208. Chromic acid, 25-35, 233. Chromoplast, 150. _Cicinnobulus_, 69; Fig. 39. Cilium, 8. Cinquefoil, 206. _Cistaceæ_. See "Rock-rose." _Cistifloræ_, 192. Citron, 196. _Citrus_. See "Orange," "Lemon." _Cladophora_, 24, 25. structure of cells, 25. nuclei, 25. cell division, 25. zoöspores, 25. Classification, 3-9. _Clavaria_, 85; Fig. 51. _Claytonia_. See "Spring-beauty." Clematis, 185. Climbing plants, 171. _Closterium_, 33; Fig. 20. Clove, 205. Clove oil, 234. Clover, 207. Club moss, 116. larger, 116. smaller, 123-126; Fig. 74. gross anatomy, 125. spores, 126. prothallium, 126. systematic position, 126. Cluster-cup, 78. _Cocos_. See "Palm-coco," 159. _Coleochæte_, 28; Fig. 17. Collateral fibro-vascular bundle, 135. _Collema_, 76; Fig. 44. Columella, 55. Columbine, 186; Fig. 99. Column, 165. _Columniferæ_, 195. _Commelyneæ_, 157. _Compositæ_, 223, 224. Compound flower, 224. leaf, 159, 170. Conceptacle, 45. Cone, 131. _Conferva_, 26. _Confervaceæ_, 21, 24. Conidium, 68. Conifer, 129, 140, 141. _Coniferæ_. See "Conifer." _Conjugatæ_, 22-29. Connective, 148. _Conocephalus_. See "Liverwort, giant." _Contortæ_, 218. _Convolvulaceæ_, 213. _Convolvulus_. See "Morning-glory." _Coprinus_, 82-84; Fig. 48. general structure, 82, 83. young spore fruit, 83. gills basidia, 83. spores, 84. Coral root, 167. _Corallorhiza_. See "Coral root." Coriander, 202. Corn, 160, 161. _Cornus_, _-aceæ_. See "Dogwood." Corolla, 174, 182. Cortex, 39, 130. _Corydalis_, 192. Cotton, 195. Cotyledon, 134, 146, 180. Cowslip, 211. Coxcomb, 185. Crab-apple, 77, 80. Cranberry, 211. _Crassulaceæ_, 203. Crane's-bill, 3, 196; Fig. 107. Cress, 192. _Croton_, 200.