A KEY, BASED MAINLY DPON THE FLOWERS, 



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

 Parts I, n, m, IV and V. 



. Angiospermae seeds in a closed ovary. 

 b. Polypetalous petals present and distinct. 

 c. Stamens numerous, more than 10, and 

 d. Calyx inferior wholly free from the pistil or pistils. 



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

 f. Anthers opening inward; leaves folded lengthwise in the bud (Mag- 



nolia), pointed at both ends and 

 g. Thick 



Glaucous beneath 51. M. GLAUCA. 



Rusty tomentose beneath 101. M. GRANDIFLORA. 



gr 2 . Thin, green beneath 1. M. ACUMINATA. 



jf 9 . Anthers opening outward and leaves folded crosswise in the bud. 



2. LlRIODENDRON TlJLIPIPERA. 



e*. Pistils more than one, separate (or nearly so) stamens inserted on re- 

 ceptacle and filaments shorter than anthers (Anonacece). 



76. ASIMINA TRILOBA. 



*. Pistil solitary and 

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



and 

 g. Compressed, with ridged margin; calyx-lobes glandular serrate. 



81. P. NIGRA. 



gr*. Marginless; flowers in 



h. Racemes terminal 29. P. SEROTINA. 



h*. Corembose umbels 55. P. PENNSYLVANICUM. 



7i 3 . Umbels; leaves 



Acuminate, hairy beneath 56. P. AVIUM. 



Acute, nearly smooth beneath 82. P. CERASUS. 



/*. Compound as shown by the styles and cells of ovary; leaves. 

 g. Punctate with pelucid dots (Aurantiacea)', stamens about 



20; fruit globose, flattened at ends. ...103. CITRUS ATTRANTTUM. 



35; fruit globose-oblong, pointed 104. CITRUS LiMONTJM. 



gp s . Not punctate. 

 h. Simple and calyx. 



Valvate in the bud, deciduous (Tttiacecz) stamens polydelphous 

 (Tilifi) and with 5 petal-like scales opposite the petals. 



3. TELIA AMERICANA. 



