KEY TO THE GENERA OF MANHATTAN PLANTS. 



16. Large, oblong,with several flat seeds 2 cm or more long ..Asimina 60 



16. Fruit and seeds smaller 17 



17. Not more than 10 seeded 18 



17. Seeds numerous, more than 10 23 



18. Seeds 10, flat, berry dark purple surmounted by 10 



styles Phytolacca 54 



18. Seeds 1 to 6 19 



19. Fruits scarlet, closely aggregated on a spadix Arasaema 14 



19. Not as above 20 



20. Berries in aixillary peduncled umbels, perianth de- 



ciduous Smilax 26 



20. Berries not in umbels 21 



21. Woody vines, berries in a cyme or thyrsus opposite 



the leaves Vitaceae 56 



21 . Herbs, berries in axils of leaves or terminal clusters 22 



22. Berries dark purple, 1 to several in aixillary clusters. Polygonatum 25 



22. In terminal clusters, variegated red and black Vagnera 24 



23. Plant fleshy, spiny, seeds campylotropous, flattened. Cactaceae 63 



23. Plant not fleshy 24 



24. Shrubs, remains of calyx at apex of berry Ribes. 87 



24. Herbs, calyx persistent at base of berry Solarium 219 



25. Fruit from a compound pistil, separating at matur- 



ity into its carpels, these indehiscent or more or 



less 2-valved 26 



25. Not as above 36 



26. In dense terminal heads, calyx superior, a shrub. . Cephalantluis 235 



26. Not as above 27 



27. Separating into 2 indehiscent carpels 28 



27. Separating into 3 2-valved carpels Ceanothus 140 



(Compare Ewplwrbiaceae.) 

 27. Separating into 4 indehiscent carpels 30 



27. Carpels in a ring, separating into 5 or more indehis- 



cent or 2 valved portions 32 



28. Carpels forming a samara with a terminal wing, trees Acer 137 



28. Carpels not forming samaras, herbs 29 



29. In umbels or heads,carpels ribbed or winged on back, 



separating from a central axis ... ........ Umbelliferae 67 



29. In heads, calyx inferior, carpels oblong Lippia 200 



29. Inflorescence open, calyx superior, carpels hemispherical. Galium 237 



30. Leaves alternate, fruit deeply lobed Borraginaceae 78 



30. Leaves whorled, aquatic herbs Myriophyllum 174 



30. Leaves opposite . . 31 



31. Fruit lobed before separation, style 1, terrestrial herbs. Labiatae 81 

 31 . Fruit lobed, styles 2, aquatic herbs Callitriche 132 



31. Fruit oblong, not lobed Verbena 199 



32. Carpels numerous, indehiscent 33 



