KEY TO THE NATURAL ORDERS. 
xliii 
ovule solitary ; styles distinct. Fruit various, often capsular, winged. — Shrubs, with 
entire opposite leaves (page 35). 
XIX. Zygophyllaceae. Stamens 5—10, free. Ovary 4-5-celled; ovules 2 or 
more ; style simple. Fruit a septicidal capsule. — Herbs or shrubs, with opposite 
compound leaves (page 35). 
XX. Geraniacese. Flowers regular or irregular. Stamens definite ; filaments 
free or united. Ovary 3 -5 -celled ; ovules 1 or many. Fruit usually capsular. — 
Herbs or shrubs, with opposite or alternate leaves (page 36). 
XXI. Rutacese. Flowers regular. Stamens usually definite, free. Carpels 
4-5, united or free at the base and joined by the style only ; ovules usually 2, super- 
posed. Fruit capsular or baccate. — Usually trees or shrubs, with opposite gland- 
dotted leaves, often compound (page 38). 
XXII. Simarubese. Flowers regular. Stamens definite, free. Carpels 2-5 
free or connate in the lower part ; ovules usually solitary. Fruit dry or drupaceous. 
— Trees or shrubs; leaves usually alternate, not dotted (page 41). 
XXIII. Ochnacese. Flowers regular. Stamens indefinite, free. Carpels 
2-10, connate ; ovules 1 or many in a cell ; styles united. Fruit various. — Shrubs or 
trees, with alternate simple leaves (page 42). 
XXIY. Burseracese. Flowers regular. Stamens definite, free. Ovary 3-5- 
celled, not lobed ; ovules 2 in a cell ; style simple. — Fruit dry or drupaceous. 
— Balsamiferous trees or shrubs with alternate pinnate leaves (page 43). 
XXY. Meliacese. Flowers regular. Stamens definite, monadelphous. Ovary 
4-5-celled ; ovules 2 in a cell ; style simple. Fruit various. — Trees or shrubs ; 
leaves alternate, pinnate or simple (page 44).* 
XXVI. Olacineae. Flowers regular. Stamens definite, usually free. Ovary 
1 -celled, or imperfectly 3-celled; ovules usually 2-3; style 0 or simple. Fruit 
a 1 -seeded drupe. — Trees or shrubs, with alternate entire leaves (page 47). 
XXVII. Celastraceae. Flowers regular. Stamens 4-5, free, opposite the 
sepals. Ovary 1-4-celled ; ovules usually 2 in a cell, erect ; style simple. Fruit 
various. — Trees or shrubs, with opposite or alternate simple leaves (page 48). 
XXVIII. Rhamnaceae. Flowers regular. Stamens 4-5, free, opposite the 
petals, which are often hooded. Ovary usually 3-celled, sometimes inferior ; ovules 
solitary, erect. Fruit capsular or drupaceous. — Shrubs or trees, with opposite or 
alternate simple leaves (page 50). 
XXIX. Ampelideae. Flowers regular. Stamens 4-5, opposite the petals, free 
or monadelphous. Ovary 2-5-celled ; ovules 1-2 in a cell ; style 0 or simple. 
Fruit a berry. — Shrubs, usually climbers with tendrils, with alternate simple or 
compound leaves (page 53). 
XXX. Sapindacese. Flowers regular or irregular. Stamens usually 8, free. 
Ovary 2-3-celled ; ovules usually 1 or 2 in a cell ; style entire in the lower part. 
Fruit dry or fleshy. — Trees or shrubs, with leaves usually alternate and compound 
(page 55). 
XXXI. Anacardiacese. Flowers regular. Stamens usually definite, free. 
Ovary 1- or many-celled ; ovules solitary, pendulous ; stigmas as many as the 
cells. Fruit fleshy. — Trees, with alternate compound or simple leaves (page 61). ' 
Series II. CALYCIFLOR2E. Flowers furnished with both a calyx and a co- 
rolla, the petals of the latter free down to the base. Stamens perigynous or epigynous. 
Exceptions : Gamopetalous, Mimosece, Roussea , Bryophyllum , Cucumis , Citrullus, 
