II.] KEY TO NATURAL ORDERS. 135 



CELASTRACEyE (p. 204). — Slirubs or trecs with opposite 

 or alternate simple leaves, and minute flowers. Ovary 

 more or less immersed in a disk. Stamens alternate with 

 the petals and equal in number, or only tliree. 



RHAMNACEiE (p. 205). — Trees or shrubs with alternate 

 simple leaves, and minute flowers. Stamens opposite to 

 the petals and equal in number. 



Melastomace^e (p. 206). — Herbs or shrubs with opposite 

 entire, usually three-nerved leaves. Petals twisted in bud. 

 Stamens ten or fewer, perigynous ; anthers frequently 

 appendaged. Ovary free or adnate. 



MvRTACEiE (p. 208). — Trees or shrubs usually with oppo- 

 site entire leaves marked with translucent glandular dots. 

 Stamens indefinite, perigynous. Ovary adherent, with axile 

 placentation. 



RHizoPHORACEiE (p. 2io). — Trees or shrubs with opposite 

 entire coriaceous leaves. Calyx-lobes valvate. Petals often 

 fringed. Stamens usually some multiple of the petals. 

 Ovary more or less adherent. 



ONAGRACEiE (p. 211). — Herbs with alternate or opposite 

 simple (sometimes if submerged, divided) leaves. Calyx- 

 teeth usually four, valvate. Ovary inferior, two- or four- 

 celled, with indefinite (rarely definite) ovules. 



Lythrace^ (p. 212). — Trees, shrubs, or herbs with 

 opposite or alternate simple leaves. Ovary free. 



CucuRBiTACEiE (p. 2 1 3). — Climbing or prostrate herbs 

 with alternate, usually palmately-nerved leaves, and lateral 

 tendrils. Flowers unisexual. Stamens usually three (one 

 with half an anther). Ovary inferior. Seeds exalbuminous. 



Begoniace^ (p. 216). — Succulent herbs with oblique, 

 radical, or alternate cauline leaves. Flowers unisexual. 

 Stamens indefinite. Ovary inferior, three-celled ; ovules 

 indefinite. 



