I. ANALYTICAL AETIFICIAL KEY TO THE ORDEES AND 

 ANOMALOUS GENEEA IN THIS VOLUME. 



SUBCLASS I. ANGIOSPERM^E continued. 



DIVISION III. APETAL.<E : corolla (and sometimes calyx) wanting, 

 genera of the preceding Divisions.] 



A. Flowers not in aments. 



[Including the apetalous 



1. Ovary and fruit superior, 1 -celled and 1-ovuled, or carpels distinct if more than one. 



Stipules sheathing the stem at the nodes. 

 A tree : flowers monoecious in globose heads : calyx none. 

 Herbs : calyx usually corolla-like : akene triangular or lenticular. 

 Stipules not sheathing the stem or none. 

 Shrubs or trees. 



Leaves alternate : flowers perfect. 



Calyx 6- parted : fruit a drupe: anthers opening by valves : odor- 

 iferous evergreen. 

 Calyx 4-cleft : fruit a berry. 



Calyx tubular, limb deciduous : fruit a tailed akene. 

 Leaves alternate : flowers unisexual : fruit a utricle. 

 Leaves opposite. 



Flowers monoecious : capsule 1-celled by abortion. BUXACE.E, 86. 



Fruit an akene : leaves small and narrow. Coleogyne in ROSACES, 32. 



Fruit a simple samara : leaves pinnate. Fraxinus in OLEACE.E, 59. 



Herbaceous, or sometimes woody at base. 



Fruit a utricle : seed lenticular : embryo annular or spiral. 



Flowers with scarious persistent sepals and bracts : no stipules. 

 Bracts herbaceous or none : no stipules. 

 Stipules scarious. 

 Fruit a more or less triangular akene : embryo curved. 



Flowers perfect, on jointed pedicels, involucrate. 

 Akene not triangular : embryo straight. 



Flowers unisexual ; filaments incurved in the bud: leaves simple. URTICACE-E, 84. 

 Submerged : flowers axillary, N naked : leaves sessile, h'liformly 



dissected. 



Flowers naked in a terminal spike : akene reniform : leaves tri- 

 foliate. Achlys in BERBERIDACEJE, 2. 

 Carpels several and distinct, 1 - several-ovuled : calyx usually 



corolla-like. RANUNCULACEJE, 1. 



2. As in (1), but ovary and fruit inclosed by the calyx and apparently inferior. 



Shrubs, with scurfy opposite entire leaves : flowers dioecious : fruit 



baccate. ELEAGNACE.E, 83. 



Herbs : calyx corolla-like : fruit an akene. 



Leaves simple, opposite, entire, without stipules : flowers involucrate. NYCTAGINACE.S:, 76. 



Leaves compound, alternate, stipulate. ROSACES, 32. 



3. Ovary and fruit superior, of 2 or more carpels. 



Fruit 2 - 4-celled, usually lobed : cells 1 - 2-ovuled. 



Fleshy maritime dioecious shrub : ovaries 4-celled, coherent. BATIDE.&:, 80. 



Capsule 3-celled, 3-lobed : juice milky : mostly herbaceous. EUPHORBIACE^:, 87. 

 Fruit 4-celled, 4-lobed, compressed, indehiscent : styles 2 : small, 



aquatic, with opposite entire leaves. CALLITRICHACK.E, 8 



Fruit fleshy, 3-celled, 3-lobed : shrubs with alternate simple leaves. RHAMNACE>E, 27. 



Fruit a double samara : trees with opposite pinnate leaves. SAPINDACE.S:, 29. 



Cruciferous herb : pod small, obcompressed. Lepidium in CRUCIFER^E, 7. 



PLATANACE*:, 85. 

 POLYGONACE.E, 77. 



LAURACE*, 81. 

 THYMELEACE.E, 82. 

 Cercocarpus in ROSACES, 32. 



CHENOPODIACFJE, 79. 



AMARANTACE.E, 78. 

 CHENOPODIACE.S, 79. 

 ILLECEBRACE.S;, 15. 



POLYGONACE.E, 77. 



CERATOPHYLLACE.fi, 90. 



