1 88 SYSTEMATIC BOTANY. 



36. Onagraceae. Flowers in fours, epigynous ; ovary oo-seeded ; 

 style I. Herbs or shrubs, without stipules. 229. 



37. Cucurbitaceae. Flowers imperfect, epigynous ; anthers united, 

 tortuous. Fruit a pepo. Climbing or prostrate herbs. 231. 



38. Cactaceae. Floral parts numerous ; ovary i - celled, with 

 parietal placentae. Fleshy and usually leafless plants. 232. 



39. Umbelliferae. Inflorescence umbellate ; ovary decarpellary, 

 splitting in two when ripe. Endosperm. 232, 



40. Araliaceae. Like 39, but with more than two styles, and the 

 fruit a drupe. 236. 



41. Cornaceae. Style I ; ovule i ; fruit a i-2-seeded drupe. 

 Woody plants, with opposite leaves. 237. 



Superior Gamopetalous Exogens. 



42. Caprifoliaceae. Ovary 2-5-celled ; leaves opposite, without 

 stipules. Shrubs, rarely herbs. 238. 



43. Rubiaceae. Like 42, but with stipules, or the leaves in 

 whorls. 240. 



44. Dipsaceae. Flowers in heads, with involucres ; stamens 4 ; 

 ovary i-celled. Endosperm. Herbs. 241. 



45. Compositae. Flowers in heads, surrounded with a common 

 involucre ; anthers syngenesious ; ovary i-celled, i-seeded ; style bifid. 

 No endosperm. Herbs. 241. 



46. Campanulaceae. Corolla 5-lobed, and stamens alternate ; 

 ovary 2-5-celled ; style I ; ovules oo. Herbs, rarely shrubs, with 

 alternate leaves and milky juice. 251. 



Inferior Gamopetalous Exogens with Regular Flowers. 



47. Ericaceae. Stamens hypogynous, anthers opening by terminal 

 pores ; ovary 2-i2-celled ; style simple. 252. 



48. Plumbaginaceae. Flowers 5-merous ; stamens opposite pet- 

 als ; ovary i -celled ; styles 3-5. The single ovule pendulous. Herbs. 



255. 



49. Primulaceae. Flowers like 48, with a single style and ovary, 

 free central placenta ; seeds oo. 256. 



50. Oleaceae. Stamens 2, epipetalous, ovary 2-celled. Trees or 

 shrubs. 257. 



51. Apocynaceae. Corolla convolute ; ovaries 2, separate ; styles 

 and stigmas united ; leaves opposite. Plants with milky juice. 258. 



52. Asclepiadaceae. Like 51, with anthers united to stigma, and 

 pollen in masses. 259. 



53. Gentianaceae. Cymose 4-5-merous flowers ; ovary i-celled. 



