-63 NATURAL SYSTEM OF JUSSIEU. 



racter of the order is derived from the internal 

 structure of the seed. 



1. Sempervivoz. — Petals and Calycine segments equally 

 numerous. Stamens determinate. Germens nu- 

 merous, accompanied by glandular scales at their 

 base. Capsule with one cell and two valves polysper- 

 mous. Embryo straight, placed abound a fleshy 

 albumen ; radicle inferior. Stem usually herbace- 

 ous. Leaves succulent. Sedum and Cotyledon are 

 examples. 



2, Sxifragoe. — Calyx 4 or 5 parted. Petals arising from 

 the summit of the calyx and alternating with its seg- 

 ments. Stamens as numerous or twice as numerous 

 as the petals. Germen simple, superior, surmoun- 

 ted by two styles and stigmas. Capsule usually ter- 

 minating in two beaks, the extremities of the two 

 valves. Seeds numerous, attached to the base of 

 the capsule or to the inflected margin of the valves. 

 Albumen fleshy. Embryo straight ; radicle inferior. 

 Saxifraga and Chrysosplcnium are examples. 



,>. Cacti. — Segments of the calyx numerous. Petals 

 numerous, attached to the summits of the calyx. 

 Stamens indeterminate. Germen inferior, surmoun- 

 ted by one style and several stigmas. Berry poly- 

 spermous. Embryo curved, without albumen. Cac- 

 tus is an example. The Grossularice, originally in- 

 cluded with the Cacti, have been separated by Des- 

 fontaines, and distinguished by the number of petals 

 and stamens, and by the internal structure of the 

 seed, having an embryo accompanied by a fleshy al- 

 bumen. Ribes is an example. 



#» Portulacece. — Petals and Stamens inserted into the 

 base of the calyx. — Germen simple, inferior. Em- 



