KEY TO THE GENERA OF MANHATTAN PLANTS. 



76. Dehiscence explosive, calyx not enlarged 77 



76. Dehiscence not explosive, calyx enlarged, veiny. .Hibiscus 151 



77. Valves elastically coiling Impatiens 139 



77. Valves pinching out the seeds and collapsing on the 



axis .Oxalis 124 



78. Seeds numerous, comose, fruit 1-celled 79 



78. Seeds not comose 81 



79. Fruit a follicle, 2 to each flower, herbs 80 



79. Placentae 2-4, trees or shrubs Salicaceae 16 



80. Follicles long and slender Apocynum 188 



80. Follicles ovate or fusiform Asclepiadaceae 73 



81. Fruit a follicle 85 



81. Not a follicle '. 83 



82. Follicles 3 to each flower Delphinium 62 



82. Follicles 4 or 5 Aquilegia 61 



83. Capsule 3 celled, or 1 celled with 3 pariet tl placentae. 84 



83 Capsule 1-celled with 2 parietal placentae 95 



83. Capsule 1 with 4 or 5 parietal placentae 98 



83 Capsule 2-celled .... 99 



84. Seeds 1 in each cell, capsule not inflated 82 



84 Seeds 2 or more in each cell 87 



85 1 of the 3 cells indehiscent Commelyna 15 



85. All ( if the cells dehiscen t 86 



86. Calyx 5 lobed, supporting the smooth globose capsule . .Phlox 193 



86. Sepals 3, endogenous herb Tradescantia 16 



86. Capsule large, leathery, prickly, seeds about 2 cm Aesculus 138 



86. Capsule 3 lobed, calyx absent or if present, the peri- 



carp pubescent Ettphorbiaceae 47 



87. Pericarp bladdery-inflated, capsule 3-celled, 3-lobed at 



summit Staphylea 136 



87. Pericarp not much inflated 88 



88. Sepals inferior, 6, narrow and glumaceous, endogens Juncus 18 



88. Sepals if present not glumaceous. 89 



89. Capsule 3-celled 90 



89. Capsule 1-celled with 3 parietal placentae 92 



90. Calyx superior, capsules umbellately clustered from 



a 2-leaved spathe, leaves equitant and stem flat. . . Sisyrinchium 27 



90. Calyx inferior 91 



91. Sepals 6, stem endogenous Liliaceae 11 



91 . Sepals 5, seeds several Mollugo 56 



91 . Sepals 5, seeds 6, velvety, 5 mm Ipomoea 189 



91. Sepals 5, petals 3, withering persistent, seeds 6, 



very small Lechea 154 



92. Capsule dehiscing explosively, the valves widely 



spreading Violaceae 61 



