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Mesembrianthemum.—Calyx partitions 
unequal. Petals o. Ovary oo-celled, 
o-seeded. Fruit a capsule. Succulent. 
Hypericum.—Calyx 4-5-parted. Petals 
4-5. Fruit a capsule. 
Mentzelia.—Ovary inferior. Calyx limb 
5-parted, persistent. Capsule 1-celled. 
Placenta 3, parietal. 
III. Polygynia. 
1. 
Spirewea.—Ovaries superior, several seed- 
ed. Fruit several follicles. Shrub. 
Rosa.—Calyx 5-parted. Petals 5. Fruit 
akenes enclosed in the calyx tube form- 
ing a spurious berry. Shrub. 
Calycanthus.-—Calyx cup-shaped, limb 
co-parted, o-seriate. Petals 0. Fruit 
o akenes enclosed in the persistent ca- 
lyx tube. Shrub. 
Rubus.—Calyx 5-parted. Petals 5. Fruit 
w@drupes on a conical receptacle. 
Shrubs. 
Horkelia. —Calyx campanulate, augment- 
ed by 5 bractlets. Styles subterminal. 
Fruit » akenes. 
Potentilla.—Calyx flattened, augmented 
by 5 bractlets. Ovaries on a slightly 
conical receptacle. Styles lateral. Ak- 
enes on a herbaceous thalamus. 
