TERNSTROEMIACEAER. 235 
THEA. Tea. Camellia. 
(Family Ternstroemiaceae). 
Shrubs: evergreen. Twigs 
moderate or slender, terete: pith 
round, more or less spongy. Buds 
rather small, solitary, sessile, 
ovoid, with 2 scales, or the flower- 
buds enlarged and exposing some 
eight 2-ranked scales. Leaf-sears 
alternate, crescent-shaped to 
nearly elliptical, more or less 
raised from a somewhat shrunken 
area: bundle-trace 1, compound, 
crescent- or C-shaped:  stipule- 
scars lacking. Leaves moderate, 
short-stalked, crenately serrate. 
(Includes Camellia). 
Tea (Thea) and coffee (Coffea) 
are entirely unrelated plants 
which produce what is regarded 
as an identical alkaloid, caffein, 
which gets its name from the lat- 
ter but is prepared commercially 
in large quantities from tea-leaves. The Paraguay tea (/lex) 
owes its stimulating properties to the same substance, as does 
the guarana (Paullinia), one of the Sapindaceae. Chocolate 
or cacao contains a closely related alkaloid, theobromin. 
1. Twigs glabrous. 2. 
Twigs somewhat loose-hairy. T. Sasanqua. 
2. Twigs slender: leaf-scars crescent-shaped. 
(Tea). (1). T. sinensis. 
Twigs stouter: leaf-scars subelliptical. 
(Camellia). (2). T. japonica. 
