PRIMUUX2E. 



513 



Cortusa. Dodecatheon. Cyclamen (Fig. 549) has solitary, long- 

 stalked flowers, and a rotate corolla with the lobes reflexed ; the 

 stalk of the capsule rolls up spirally; the tuberous rhizome is 

 formed by the hypocotyledonary internode. Only 1 cotyledon. 

 Lysimachia (Money-wort) ; stem-internodes well developed, leaves 

 opposite or verticillate, calyx almost polysepalous, corolla deeply 

 5-partite (Fig. 550). The flowers are solitary or in racemes. 

 Anagallis (Pimpernel), leaves opposite, flowers solitary; the fruit a 

 pyxidium (Fig. 551) ; similarly in Centunctdus, which is 4-merous. 

 Trientalis, the flowers are most frequently 7-merous. Glaux 

 (Sea Milk-wort) is a creeping maritime plant with opposite leaves ; 

 flowers solitary in the leaf-axils, corolla absent, but with coloured 

 calyx. The petals are usually developed later than the stamens in the Prium- 

 laceae ; but in this instance they are entirely suppressed. Samolus (Brook- 



FIG. 5 r O. Lysimachin t/tj/rst/tora. 



FIG. 551. Anaqallis arvensis. 

 Fruit dehiscing. 



weed) differs from all the others in having an epigynous flower; 

 barren sepal-stamens are also present. The bracts in the race- 

 mose inflorescences are displaced along the flower-stalks. 



POLLINATION. Insect-pollination in the majority; cross-pollination is pro- 

 moted in some by heterostyly (Fig. 548). 300 species ; especially in northern 

 temperate zones ; the majority on mountains (Soldanella, Androsace, etc.) ; 

 almost absent in the Tropics. A large number are ORNAMENTAL PLANTS, e.g. 

 Primula auricula (from the Alps), P. sinensis (China), P. elatior (Oxslip, a 

 native) and grandijiora, etc. Cyclamen europeeum (Alpine Violet) ; the tubers 

 are poisonous. 



Order 2. Myrsinacese. Trees or shrubs ; evergreen, tropical Primulacese 

 with fleshy fruits and few seeds, embedded in the placenta. The leaves are 

 nearly always dotted with yellow glands (schizogenous resin-receptacles). 

 550 species ; especially Am. ORNAMENTAL PLANTS : Ardisia crenulata (W. Ind.) ; 

 other genera: Clauija, Haesa, Theophrasta (barren sepal- stamens), Myrsine, 

 Jacquinia (barren sepal-stamens), etc. ^giceras, allied to this order, comprises 

 arborescent plants, often growing with Bhizophora in tropical forests, along 

 the shore. The embryo germinates while still in the fruit. 



