ARTSTOLOCHIACEAK. 71 



3 bundle-traces; minute transverse stipule scars; ovoid sessile 

 often collaterally multiple buds with half-a-dozen exposed scales 

 in several ranks ; short-petioled oblique toothed rather small 

 leaves; inconspicuous often imperfect apetalous flowers; and 

 small drupe-like fruits. 



1. Leaves large (4X8 cm.), acuminate. Z. serrata. 

 Leaves smaller (scarcely 3X6 cm.), not acuminate. 2. 



2. Leaves lanceolate, rather long (4-5 cm.). Z. Davidii. 

 Leaves elliptical or ovate, short (3-4 cm.). Z. ulmoides. 



CELTIS. Hackberry. 



Rather ovoid much branched deciduous trees, or occasion- 

 ally shrubs, with variously roughened or warty bark ; hard pale 

 or red-brown wood with a vernal zone of medium-sized ducts 

 and smaller summer ducts in a wavy transverse pattern, and fine 

 medullary rays ; slender sometimes grooved sympodial zig-zag 

 tw'gs with somewhat angular pale pith chambered in places; alter- 

 nate 2-ranked appressed small buds with several 2-ranked scales ; 

 crescent-shaped leaf-scars with 3 bundle-traces ; minute stipule- 

 scars ; ovate lanceolate truricately or cordately oblique moderate- 

 sized often serrate simple leaves; small monoecious greenish 

 apetalous flowers solitary or few together ; and small sugary 

 drupes with reticulate or pitted stone. 



1. Trees. 2. 



Shrubs : buds small. C. pumila. 



2. Leaves entire and glabrous : buds small. C. mississiopiensis. 

 Leaves toothed or pubescent: buds larger. C. occidentalis. 



Family ARISTOLOCHIACEAE. "Birthwort Family. 

 A rather small family, chiefly of herbs, of little use except 

 that species of Aristolochia (e.g. the goose-flower) are often 

 grown under glass for their large or peculiar, usually ill-scented, 

 flowers. 



ARISTOLOCHIA. Dutchman's Pipe. 



Woody twiners (as here considered) with brown wood with 

 large diffused ducts and broad wedge-shaped medullary rays ; for 

 a time green sympodial stems swollen at the nodes ; pale 



