54 Key to the System of 



VINIFERAE. 



266. Stamens singly opposite to the petals. 



Climbers, with evergreen or deciduous foliage and with 

 tendrils ; leaves simple or compound, but hardly ever 

 pinnate ; stamens disconnected ; ovulary usually two- 

 celled, with two ovules in each cell; fruit succulent. 

 Figure 26. (Genus the only one of the whole order). 



Vitis. 1189 



HALORACEAE. 



267. Calyx present 268 



Calyx absent 270 



268. Fruit usually one-seeded. 



Herbs or somewhat shrubby plants, always terrestrial; 

 leaves scattered, narrow, entire ; petals rather large, two 

 to four; stamens four to eight ; stigmas two to four; fruit 

 biangular or quadrangular; albument present. 



Loudouia. 1190 



Fruit two- or three- or four-seeded ... ... 269 



269. Fruit finally seceding into fruitlets. 



Herbs, partly or nearly submersed; leaves often divided into 

 very narrow segments ; petals never large, usually four in 

 the staminate flowers, generally none in the pistillate 

 flowers ; stamens two to eight ; stigmas two to four ; fruit 

 usually quadrangular ; albument present. 



Myriophyllum. 1191 



Fruit never seceding into fruitlets. 



Herbs or somewhat shrubby plants, mostly terrestrial ; 

 leaves scattered or opposite, often denticulated ; petals 

 four, rarely three or two, seldom large; stamens eight, 

 rarely six or four ; stigmas four or much less often two ; 

 fruit usually quadrangular, rarely tri- or bi-angular; 

 albument present. Figure 55. Haloragis, 1197 



270. Leaves small, undivided. 



Herbs, often submersed ; leaves opposite or the uppermost 

 crowded, all quite entire ; bracteoles two ; sepals and 

 petals none ; stamen one ; stigmas two ; fruit compressed, 

 two- or four-lobed, indehiscent. Callitriche. 1208 



