1XX INTRODUCTION. 



II. Barberry family. Perianth and stamens in twos or threes, or their mul- 

 tiples. Anthers opening by recurved valves. 



III. Waterlily family. Aquatic plants with indefinite petals and stamens, 

 the inner petals passing gradually into the outer stamens. 



## Ovary syncarpous. Placentas parietal {except in the Milkwort Family). 



IV. Poppy family. Perianth regular, in twos or fours. Stamens indefinite. 



V. Fumitory family. Perianth very irregular, in twos or fours. Stamens 6, 

 in two sets. 



VI. Crucifer family. Sepals and petals 4 each. Stamens 6, of which 2 

 shorter. 



VII. Mignionette family. Petals small, unequal, some divided. Stamens 

 few but indefinite. Capsule open at the top before it is ripe. 



VIII. Cistus family. Sepals 3, equal, or with additional small ones. Petals 

 5, regular. Stamens indefinite. 



IX. Violet family. Stamens 5 ; the anthers on the inner face, of very short 

 broad filaments, usually united in a ring. Capsule three-valved. 



X. Milkwort family. Perianth very irregular. Stamens 8 in two parcels; 

 petals united with them. Capsule 2-celled. 



XI. Frankenia family. As in the Pink family, except the parietal placentas. 



# ** Ovary syncarpous. Placentas axile. 



XII. Pink family. Leaves opposite, entire. Flowers regular. Stamens de- 

 finite. Capsule one-celled, with a free central placenta. 



XIII. Purslane family. As in the Pink family but only 2 sepals and 5 or 

 more petals. 



XIV. Tamarisc family. Shrubs with alternate green scale-like leaves. 

 Flowers regular. Capsule one-celled. Seeds with a tuft of wool. 



XV. Elatine family. As in the Pink family, but the capsule divided into cells. 



XVI. Hypericum family. Leaves opposite. Flowers regular. Sepals im- 

 bricate. Flowers indefinite, in 3 or 5 clusters or bundles. 



XVII. Flax family. Leaves entire. Petals convolute, distinct. Stamens 

 definite. Capsule separating into carpels without leaving a central axis. 



XVIII. Mallow family. Sepals valvate. Petals convolute, adhering at the 

 base to the staminal tube. Stamens indefinite, monadelphous, with one-celled 

 anthers. 



XIX. Lime family. Trees. Sepals valvate. Petals free. Stamens in- 

 definite. 



XX. Geranium family. Leaves opposite, toothed or divided. Petals con- 

 volute. Stamens definite. Capsule with several cells and lobes round a per- 

 sistent central axis. 



(Balsam genus. Perianth very irregular. Stamens 5, the anthers cohering 

 in a ring. Capsule opening elastically.) 



XXI. Maple genus or tribe (of Sapindacece) . Trees. Leaves opposite. Sta- 

 mens definite, but seldom isomerous. Fruit separating into 2 (rarely 3) winged 

 nuts. 



Subclass 2. Calyciflores. — Petals usually distinct, and stamens perigynous 

 or epigynous. 



* Stamens and petals mostly perigynous (except in the Oenothera, Gourd, 

 and Rib es families). 



XXII. Celastrus family. Shrubs or trees, with small regular green flowers. 

 Stamens alternating with the petals, on a disk lining the base of the calyx. 



XXIII. Buckthorn family. As in the Celastrus family, but the stamens are 

 opposite the small concave or scale-like petals. 



