TREES OR SHRUBS WITH RESINOUS JUICE; LEAVES USUALLY EVERGREEN.
Fruit a cone, either dry or berry-like. =Pinaceæ.=
Fruit a fleshy crimson berry. =Taxaceæ.=
TREES, SHRUBS, OR VINES WITH WATERY JUICE.
Leaves deciduous.
_Flowers in catkins._
Staminate and pistillate catkins on different
plants; seed with white, silky hairs. =Salicaceæ.=
Staminate and pistillate catkins on the same
plant; fruit cone-like. =Betulaceæ.=
_Flowers not in catkins._
(A) Trees.
Leaves simple, not lobed; flowers white. =Drupaceæ.=
Leaves lobed; flowers greenish-yellow. =Aceraceæ.=
Leaves pinnate; flowers white. =Pomaceæ.=
(B) Shrubs or vines.
*Stems spiny erect or trailing.
(_a_) Leaves simple or lobed.
Flowers small in dense terminal racemes.
=Araliaceæ.=
Flowers few in axillary clusters or racemes.
=Grossulariaceæ.=
(_b_) Leaves pinnate or palmate. =Rosaceæ.=
**Stems not spiny but with minute scales;
fruit silver, scarlet or orange berries.
=Elæagnaceæ.=
***Stems erect, smooth.
(_a_) Petals distinct.
†Leaves simple.
Flowers small, in flat heads or clusters.
Petals 4; stamens 4. =Cornaceæ.=
Petals 5; stamens numerous. =Rosaceæ.=
Flowers in axillary clusters or racemes;
petals 5; stamens numerous.
Fruit a berry. =Drupaceæ.=
Fruit a pome. =Pomaceæ.=
††Leaves pinnate; flowers yellow. =Rosaceæ.=
(_b_) Petals united.
Flowers small, short-campanulate in
axillary or terminal heads.
=Caprifoliaceæ.=
Flowers large, funnel-form, in terminal
or axillary clusters. (_Azaleastrum_)
=Ericaceæ.=
Flowers bell or urn-shaped, few, axillary.
=Vacciniaceæ.=
****Stems creeping or twining, smooth or hairy.
Flowers with distinct petals, blue or
purple. (_Atragene_). =Ranunculaceæ.=
Flowers with united petals.
Corolla tubular. =Caprifoliaceæ.=
Corolla bell-shaped. =Ericaceæ.=
Leaves evergreen; shrubs or vines.
Leaves pinnate; flowers yellow. =Berberidaceæ.=
Leaves simple.
Flowers inconspicuous; fruit a black berry. =Empetraceæ.=
Flowers showy, open, campanulate or urn-shaped,
white or pink. =Ericaceæ.=