KEY TO NATURAL ORDERS. 23 
B. FLOWERS, ONE OR BOTH SORTS, IN AMENTS OR CATKIN-LIKE HEADS. 
Twining dicecious herbs; fertile flowers only PAGB 
hort aments. cintiud ? in URTICACER, 291 
sy pols parasitic on trees. Fruit a a berry. LORANTHACEE, 286 
“hetero pet only in aments. Flowers 
- moneecious. 
= pinnate. Ovary and fruit with- 
t an involucre. JUGLANDACEX, 302 
tac simple. eggs one or more in a 
cup or inyolue CUPULIFERZ, 3807 
— of both kinds in aments or close 
eads. 
gant apa or lobed. 
Calyx 4-cl ne Bes in the fertile flowers 
becoming berry-like. Morus in URTICACE, 291 
wers monoecious or dicecious. ae 
branched. Leaves simple. CONIFERS, 333 
Calyx none: flowers inround heads, PLATANACEA, 301 
Leaves siemierysih rap 
Flowers dioecious, 1 on each scale. 
ge y-seeded. SALICACES, 828 
Flowers moneecious, the fertile ones 
; 2 or more under each scale. BETULACES, 524 
! Flowers only 1 under each fertile 
{ 4 
: Fruit 1-seeded. MYRICACEX, 823 
Sup-ciass 2. Gymnosperus. Pistil ep by an open scale or leaf, 
or scutes entirely wanting; the ovules seeds naked. “ 
