KEY TO THE ORDERS. 
xxi 
Stamens 2. Order 41. Oleales. 
Stamens more than 2. 
Ovule solitary in each carpel. 
Styles distinct; ovule pendulous. 
b. 
Families in Order 28. Geraniales. 
Styles united ; ovule erect or ascending. 
Limnanthaceae in Order 31. Sapindales. 
Ovules 2 or more in each carpel. 
Order 34. Hypericales. 
tt Stamens inserted on the margin of a disk or hypanthium (peri- 
gynous or hypogynous). 
Stamens as many as the petals and opposite them. 
Styles and upper part of the ovaries distinct; ovules and seeds 
many. Saxifragaceae in Order 27. Rosales. 
Styles united, ovules and seeds solitary or 2. 
Order 32. Rhamnales. 
Stamens as many as the petals and alternate with them, or more. 
Styles distinct; upper part of the ovaries distinct, at least at 
maturity. Saxifragaceae in Order 27. Rosales. 
Styles united. 
Hypanthium flat or obsolete: disk fleshy. 
Plants without secreting glands in the bark. 
Order 31. Sapindales. 
Plants with secreting glands in the bark. 
Rutaceae in Order 28. Geraniales. 
Hypanthium cup-shaped or campanulate: disk obsolete or in¬ 
conspicuous. Order 37. Myrtales. 
Ovary inferior. 
Stamens numerous. 
Hypanthium not produced beyond the ovary. 
Ovary partly inferior. Hydrangiaceae in Order 27. Rosales. 
Ovary wholly inferior. Order 35. Opuntiales. 
Hypanthium produced beyond the ovary. 
Families in Order 37. Myrtales. 
Stamens not more than twice as many as the petals. 
Styles wanting ; stigmas sessile. 
Gunneraceae in Order 37. Myrtales. 
Styles present. 
Styles distinct. 
Ovules several in each cavity of the ovary; fruit a capsule 
or a fleshy many-seeded berry. 
Fruit, if dehiscent, valvate. 
Families in Order 27. Rosales. 
Fruit circumscissile. 
Portulacaceae in Order 24. Chenopodiales. 
Ovules solitary in each cavity of the ovary ; fruit a drupe or 
2-5 more or less united achenes. Order 38. Umbellales. 
Styles united, or single. 
Plants without tendrils. 
Ovary enclosed in or surpassed by the hypanthium or ad- 
nate to it. 
Ovules solitary in each cavity of the ovary. 
Order 38. Umbellales. 
Ovules several in each cavity. 
Ovary with parietal placentae. 
Loasaceae in Order 35. Opuntiales. 
Ovary with central or basal placentae. 
Families in Order 37. Myrtales. 
Ovary exceeding the hypanthium, the top free. 
Hydrangiaceae in Order 27. Rosales. 
264 
217 
225 
231 
170 
227 
170 
225 
221 
240 
170 
234 
240 
248 
169 
125 
249 
249 
234 
240 
175 
