NATURAL 0RDEK5. 



277 



Fig. 200. 



Fig. 201. 



the liml) 5-cleft, regular, or somewhat nnequal, deeidaous. 

 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, Ac, and the tubers of the 

 Potato, are edible. 



Genera. — Petunia, Nicotiana, Datura, Hyoscya- 

 mus, " Physalis, Capsicum, Solan una, Androcera, 

 Atropa, Lycium. 



Fig. 200, «, Petunia violacece ; b, a cross section 

 of the ovary ; c, a section of the seed of Solanum 

 dulcamara. 



497. Apocynace^, the Dog-bane Tribe.— Trees^ shrubs^ or 

 herbs, with milky juice. .Leaves o]3posite, entire, exstipulate. 

 Calyx 5-parted, persistent. Corolla 5-lobed, twisted in aestiva- 

 tion. Stamens 5, inserted on the co- 

 rolla, alternate with its lobes ; Jlla- 

 ments distinct; anthers adhering to 

 the stigma ; pollen granular. Ovai'ies 

 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 ; em bryo large 

 and straight, in little albumen. 



a. Properties : many plants of this order are poi- 

 sonous ; some are medicinal, and a few are edible. 



Genera. — Vinca, Amsonia, Apocynum, Nerium, 

 Echites. 



Fig. 201, a, Vinca minor ; b, style and stigma ; 

 c, perpendicular section of the double ovary ; d, section of a seed. 



498. AscLEPiADACEJE, the Ifllk-ioeed Tribe. — Shrubs, occa- 

 sionally herbs, with milky juice. Leaves opposite, sometimes 

 alternate or whorled, having cilice between their petioles in 

 place of stipules. Floivers 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 ; jpollen cohering 

 in w^ax-]ike masses attached in pairs to 5 glands of the stigma. 

 Ovaries 2 ; styles 2, often very short, closely approaching each 

 other ; stigma common to both styles. Fruit consisting of 2 

 follicles with a placenta on the ventral suture. Seeds pendulous, 

 usually with a silky coma; embryo straight, in tliin all)umen. 



