I. ANALYTICAL ARTIFICIAL KEY TO THE ORDERS AND 

 ANOMALOUS GENERA IN THIS VOLU.AIE. 



Subclass I. ANGIOSPERM^ continued. 



Division III. APETALiE : corolla (and sometimes calyx) wanting. [Including the apetalous 

 genera of the preceding Divisions.] 



A. Flowers not in aments. 



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. Platanace^e, 85. 



Herbs : calyx usually corolla-like : akene triangular or lenticular. Polygonace^, 77. 

 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. Laurace^, 81. 

 Calyx 4-cleft : fruit a berry. Tiiymeleace^, 82. 

 Calyx tubular, limb deciduous : fruit a tailed akene. Cercocarjius in Rosacea;, 32. 

 Leaves alternate : flowers unisexual : fruit a utricle. Cuenopodiace-e, 79. 

 Leaves opposite. 



Flowers monoecious : capsule 1-celled by abortion. Buxace.^, 86. 



Fruit an akene : leaves small and narrow. Coleogyne in Rosacea, 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. Amarantace.e, 78. 

 Bracts herbaceous or none : no stipules. Chenopodiace-e, 79. 



Stipules scarious. Illecebkace^, 15. 



Fruit a more or less triangular akene : embryo curved. 



Flowers perfect, on jointed pedicels, involucrate. Polygonace.!:, 77. 



Akene not triangular : embrvo straight. 



Flowers unisexual ; filaments incurved in the bud : leaves simple . Urticace^, 8-1. 

 Submerged : flowers axillary, naked : leaves sessile, filiformly 



dissected. . Ceratophyllace^:, 90. 



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

 foliate. Achlys in Berberidace.*:, 2. 

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



corolla-like. Ranunculace^, 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. El^agnace^, 83. 



Herbs : calyx corolla-like : fruit an akene. 



Leaves simple, opposite, entire, without stipules : flowers involucrate. Nyctaginacej:, / b. 

 Leaves compound, alternate, stipulate. Rosace^e, 32. 



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



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



Fleshy maritime direcious 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. CALLiTRlCHACEi:, S». 



Fruit fleshy, 3-celled, 3-lobed : shrubs with alternate simple leaves. Rhamxace.e, 2/. 



Fruit a double samara : trees with opposite pinnate leaves. _ SAPiNnACE*:,^'-9. 



Cruciferous herb : pod small, obcompressed. Lepidmm m tRUCiFEii^, /. 



