ARISTOLOCHIACEAE. 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; incorspicuous often imperfect apetalous flowers; and 
small drupe-like fruits. 
1. Leaves large (4 X 8 cm.), acuminate. Z. serrata. 
Leaves smaller (scarcely 3 K 6 cm.), not acuminate. 2. 
2. Leaves lanceolate, rather long (4-5 cm.). Z. Dayidit. 
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 
twigs with somewhat angular pzle 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 truncately 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. 
Ba Trees): 2. 
Shrubs: buds small. C. pumila. 
2. Leaves entire and glabrous: buds small. CC. mississippiensis. 
Leaves toothed or p:tbescent: 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 
