Classification] of Plants 



355 



Datura. — Calyx deciduous. Fruit a thorny 4-celIed capsule. 



Nicotiana. — Calyx persistent, bell-shaped, 5-fid. Capsule 2-celled, 

 many-seeded. 



Retzia. — Calyx deeply lobed. Corolla tubular. Capsule few- 

 seeded. 



Solatium. — Corolla wheel-shaped, white, yellow, or purple. 

 Anthers yellow, forming a cone, as in 

 some of the Boraginaceae. 



A large genus of herbs, shrubs, or trees, 

 often prickly or spiny. Often densely 

 covered with star-shaped hairs. The potato 

 and ^g^ plant, natives of South America, 

 belong to this genus. Engler also includes 

 the tomato. The berries are showy, bright 

 red, yellow, or blue. By cultivation, the 

 number of carpels in the Tomato has been 

 increased. By heaping earth around the 

 stem more underground stems are developed 

 in the Potato and so the crop is increased. 



^ ■ 337.— Floral diagram 

 of Solanum showing ob- 

 liquely placed ovary. 



Physalis. — This genus may be recognized by the bladdery 

 calyx. P. peruviana^ L., is the " Cape Gooseberry ". Other 

 species of this genus are native. 



Lycium. — Small trees, often with spiny thorns, funnel- 

 shaped. Reddish flowers, usually solitary. L. a/rum, L. (Kaffir 

 thorn) is used for hedges. 



Datura. — ^The shrub in many gardens with large white 

 hanging bells and thorny capsules belongs to this genus. 

 Capsule 4-locular by secondary divisions. 



D. Stramonium, L. — The purple Stramonium grows in waste places. 

 Bees are debarred from this flower by the inward turn of the stamens, but 

 the long tongue of moths can reach the nectar. The plant is poisonous. 



Nicotiana (Wild Tobacco) is found in many parts of the 

 Cape. It is not a native of this country. 



Order Scrophulariace^. 



Flowers perfect in cymes or racemes. Calyx 4- or 5- 

 parted. Persistent. Corolla 5 -parted, or 4 by the union of two 

 back petals, often 2-lipped. Anthers 4, of two lengths 



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