ANGIOSPEBMAE 



place ( 30 ). Erythraea, Centaury. Menyanthes, Bog-Bean. L'imnanthemum, aquatic 

 plants with floating leaves. 



OFFICIAL. Gentiana lutea and other species yield GEXTIAXAE IIADIX. CHIRATA 

 is obtained from Swertia chirata (N. India). 



Family 4. Apoeynaeeae. Evergreen plants with latex. Especially 

 numerous in the tropics. 

 Stigma ring-shaped. 

 Carpels only united in 

 the region of the style, 

 free below and separat- 

 ing after fertilisation. 

 Usually two follicles 

 with numerous seeds 

 provided with a tuft of 

 hairs (Figs. 744, 745). 



The only British species 

 is Vinca minor, the ever- 

 green Periwinkle, occurring 



FIG. 730. Fraxinus ornu& 

 Flower and fruit. 



FIG. 740. Strychnos mix vomica (i nat. size). Fruit and seed 

 whole and in cross-section. OFFICIAL and Poisonous. 



in woods (Fig. 742). Xerium oleander (Fig. 743), a native of the Mediterranean 

 region. The floating fruit of Cerbera Odollam, from the mangrove vegetation, is 

 shown in Fig. 576. 



OFFICIAL. Strophanthus kombe and" S. hispidus ( 31 ) (Fig. 745), lianes of tropical 

 Africa, yield STUOPHAXTHI SEMIXA. A bark is obtained from Alstonia constricta 

 and A. scholar is. 



Caoutchouc ( 3i ) is obtained fromjftefcgia elastica and other species, trees of tropical 

 W. Africa. It is also obtained from numerous species of Latidolphia (L. KirTcii, 

 Heudelotii, comorensis, etc.), Carpodinus from tropical Africa. Hancornia speciosa, 

 a tree of the dry Brazilian Campos, and Jniloughbeia firma, W.flavescens, and other 

 species of this Malayan genus of lianes, are also rubber-yielding plants. Gutta- 

 percha is present in the latex of Tabernaemontana Donnell Smithii, Central America. 



Family 5. Aselepiadaeeae. Similar and closely related to the 

 Apoeynaeeae but differing in the carpels being free, only united by the 

 prismatic stigma. Stamens united at the base, with dorsal, nectar- 

 secreting appendages forming a corona. The pollen of each pollen sac 



2 Y 



