A KEY, BASED MAINLY DPON THE FLOWERS, 



Designed as an Aid in the Identification of the Species represented in 



Parts I and II. 



a. Angiospermae seeds in a closed ovary. 

 b. Polypetalous petals present and distinct. 

 c. Stamens numerous, more than 10, and 



(1. Calyx inferior wholly free from the pistil or pistils. 



e. Pistils numerous and cohering in a cone-like mass. (Magnolictcice.) 

 f. Anthers opening inward; leaves folded lengthwise in the bud (Magnolia), 

 pointed at both ends, oval, thin and green both above and below. 



1. M. ACUMINATA. 



ff. Anthers opening outward and leaves folded crosswise in the bud. 



2. LlRIODENDRON TULIPIFERA. 



ee. Pistil solitary and 



/. One-celled, style single, flowers perfect, stone of drupe horny (Prunus), 

 turgid ovate, marginless; flowers in terminal racemes, leaves lance- 

 oblong, thickish 29. P. SEROTINA. 



ff. Compound as shown by the styles and cells of ovary; calyx valvate in 



the bud, deciduous (Tttiace); stamens somewhat polydelphous (Tttia) 



and with 5 petal- like scales opposite the petals .. 3. T.AMERICANA. 



dd. Calyx superior adnate to the ovary which is 2-5-celled with 2 ovules 



in each cell, carpels cartilaginous (Pyrus); leaves simple, glandless, 



serate, veins incurved, styles 5, united below 30. PYRUS MALUS. 



CC. Stamens few, not more than 10, alternate with the petals when of the same 



number. 

 d. Calyx inferior free from the ovary. 



e. Ovaries 2-5, separate; stamens distinct and inserted on the receptacle; 

 trees with pinnately compound and uniformly opaque leaves. 



4. AlLANTHUS GLANDULOSUS. 



ee. Ovary single, but compound as shown by the cells, styles or stigmas. 

 /. One-celled and one-seeded; styles or stigmas three; shrubs or trees 

 with regular flowers (Anacardiacece); leaves compound with 11-31 

 oblong lanceolate acuminate leaflets; common petiole densely villous 



and not winged; flowers in terminal thyrses 5. RHUS TYPHINA. 



ff. Three-celled with two ovules in each; style single; flowers irregular; 



stamens 6-8 (Aesculus); fruit covered with prickles; leaves pal- 



mately compound with 7 obovate leaflets. . . .6. A. HIPPOCASTANUM. 



eee. Ovary single and simple with one parietal placenta, corolla subregular 



(not papilionaceous) and imbricated in aestivation. 

 /. Flowers dioecious; stamens 10; tree unarmed. 



27. GYMNOCLADUS CANADENSIS. 

 ff. Flowers polygamous; stamens 5; tree armed with thorns (QleditscMa) 



which are triple and pods linear 28. G. TRIACANTHOS. 



dd. Calyx superior adnate to the ovary; flowers in umbels; stamens 5; 

 styles 5; fruit drupe-like with 5 cells each with a single ovule (Aralia); 



arborescent and armed with prickles 8. ARALIA SPINOSA. 



bb. Apetalous without petals. 



c. Flowers not in catkins: pistil one, simple or compound, and the cells of the 



ovary containing 1-2 seeds each. 



d Ovary inferior adnate its whole length to the calyx-tube 1-celled and 

 1 -seeded; style 1 stigmatic down the side (Nyssa}; fertile peduncle bear- 

 ing each two or more flowers. . 9. N. MULTIFLORA. 



