_Cruciferæ_. See "Mustard family." _Crucifloræ_. See "_Rhœadinæ_." Cucumber, 221. Cucumber-tree. See "Magnolia." _Cucurbitaceæ_. See "Gourd." Cup fungi ("_Discomycetes_"), 71. _Cupuliferæ_, 183. Curl, 66. Currant, 203. _Cuscuta_. See "Dodder." Custard-apple, 186. _Cyanophyceæ_. See "Blue-green slime." _Cyathus_, 84; Fig. 50. _Cycad_, _-eæ_, 140. _Cycas revoluta_, 141; Fig. 71. _Cyclamen_, 212. _Cynoglossum_. See "Hound's-tongue." _Cyperaceæ_. See "Sedge." _Cyperus_, 161. Cypress, 142. _Cypripedium_. See "Lady's-slipper." _Cystopus_. See also "White rust." _bliti_, 57; Fig. 33. general structure, 57. structure of filaments, 57. non-sexual spores (conidia), 57. germination of conidia, 58. resting spores, 59. oögonium, 59. antheridium, 59. _candidus_, 60; Fig. 34. Daisy, 223. Dandelion, 66, 223; Fig. 125. _Darlingtonia_, 195. _Datura_. See "Stramonium." Day lily, 155. Deadly nightshade, 215. Dead nettle, 215; Fig. 120. _Delphinium_. See "Larkspur." Dermatogen, 176. Desmid, 33, 34; Fig. 20. Devil's apron. See "_Laminaria_." _Dianthus_. See "Pink." _Diatomaceæ_, 41, 42; Figs. 24, 25. structure, 42. movements, 42. reproduction, 42. _Dicentra_, 192; Fig. 103. Dicotyledon, 145, 170, 181, 225. _Digitalis_. See "Foxglove." Diœcious, 88. _Dionæa_. See "Venus's fly-trap." _Dioscoreæ_. See "Yam." _Dioscorea villosa_, 154. _Diospyros_. See "Persimmon." _Diospyrinæ_, 210. _Dipsacus_, _-aceæ_. See "Teasel." _Dirca_. See "Moosewood." Ditch-moss, 167; Fig. 91. Dodder, 214. _Dodecatheon_. See "Shooting-star." Dog-bane, 219; Fig. 122. Dogwood, 202, 229; Fig. 110. _Draparnaldia_, 26; Fig. 14. _Drosera_ _-aceæ_. See "Sun-dew." Drupe. See "Stone-fruit." Duck-weed, 159; Fig. 86. Dutchman's pipe. See "_Aristolochia_." Earth star. See "_Geaster_." _Ebenaceæ_ (ebony), 212. _Echinospermum_. See "Beggar's-ticks." _Ectocarpus_, 45, 47; Fig. 28. Eel-grass, 168, 169; Fig. 91. Egg apparatus, 144. Egg cell, 27, 36, 39, 45, 90, 106, 133, 144. Egg-plant, 215. Eichler, 153. Elater, 91, 122. Elder, 224. _Elæagnaceæ_, 206. Elm, 183. _Elodea_. See "Ditch-moss." Embryo, 90, 97, 107, 133, 149, 180. Embryology, 3. Embryo sac, 143, 144, 151. _Enantioblastæ_, 153, 156; Fig. 85. Endosperm, 133, 146, 152. Entire leaves, 170. _Entomophthoreæ_, 57. _Epacrideæ_, 210. Epidermis, 91, 111, 112, 113, 122, 135, 137, 150, 177. _Epigæa_. See "Trailing arbutus." _Epilobium_. See "Willow-herb." _Epiphegus_. See "Beech-drops." Epiphyte, 166. _Equisetum_, _-tinæ_. See "Horse-tail." Ergot, 76. _Erica_, _-aceæ_. See "Heath." _Erysiphe_, 70. _Erythræa_. See "Centaury." _Erythronium_, 146-152; Fig. 81. leaf, 146. stem, 146. root, 146. gross anatomy of stem, 147. flower, 148. fruit and seed, 150. histology of stem, 150. of leaf, 150. of flower, 151. of ovule and seed, 151, 152. _Eschscholtzia_, 191. _Eucalyptus_, 206. _Eucyclæ_, 196, 200. _Eudorina_, 20.