NATURAL ORDEKrS. 
till 
the Umh 6-cleft, regular, or somewhat unequal, deciduous. 
Stamens inserted upon the corolla, equal in number to its seg- 
ments and alternate with them. Ovary 
2-celled ; ovules indefinite. Fruit ei- 
ther capsular or baccate. Seeds in- 
definite; embryo straight or curved, 
in fleshy albumen. 
a. Properties: stimulant and narcotic. The 
herbage and fruits are mostly deleterious, often 
violently poisonous ; yet the berries of some, as 
the Egg-plant, Tomato, kc, and the tubers of the 
Potato, are edible. 
Genera. — Petunia, Nieotiana, Datura, Hyoscya- 
mus, Physalis, Capsicum, Solanum, Androcera, 
Atropa, Lycium. 
Fig. 200, a. Petunia violacece ; b, a cross section 
of the ovary ; c, a section of the seed of Solanum 
dulcamara. 
497. Apocynaceje, the Dog-hane Tribe. — Trees., shricbs^ or 
herbs^ with milkj juice. Leaves opposite, entire, exstipulate. 
Calyx 5-parted, persistent. Corolla 5-lobed, twisted in asstiva- 
tion. Stamens 5, inserted on the co- 
rolla, alternate with its lobes ; fila- 
ments distinct; anthers adhering to 
the stigma ; pollen granular. Ovaries 
2, distinct, or rarely united ; stigma 
1, contracted in the middle. Fruit 
either follicular, capsular, drupaceous, 
or baccate ; either double or single. 
Seeds usually pendulous ; embryo large 
and straight, in little albumen. 
a. Properties : many plants of this order are poi- 
Bonous ; some are medicinal, and a few are edible. 
Genera. — Vinca, Amsonia, Apocynum, Nerium, 
Echites. 
Fig. 201, a, Vinca winor; 6, style and stigma; 
perpendicular section of the double ovary ; c?, section of a seed. 
498. AscLEPiADACE^, the Milk-weed Tribe. — Shrubs^ occa 
sionally herbs., with milky juice. Leaves opposite, sometimes 
alternate or whorled, having cilise between their petioles in 
place of stipules. Flowers somewhat umbelled, fascicled, or 
racemose. Calyx 5-parted, persistent. Corolla regular, 5- 
lobed, deciduous. Stamens inserted into the base of the co- 
rolla, alternate with its lobes ; anthers 2-celled ; pollen cohering 
in wax-like masses attached in pairs to 5 glands of the stigma. 
O'varies 2 ; styles 2, often very short, closely approaching each 
other ; stigma common to both styles. Fruit consisting of 2 
/oUicles with a placenta on the ventral suture. Seeds pendulous, 
usually with a silky coma; embryo straight, in thin albumen. 
