Natural orders. « 



irregular. Stamens definite. Capsule with several cells and lobes 

 round a persistent central axis. 



XXI. AcERACE^ (genus or tribe of Sapindacece, figs. 221-2). 

 Trees. Leaves opposite. Stamens definite, but seldom isomerous. 

 Fruit separating into 2 (rarely 3) winged nuts. 



Sub-class 2. Calyciflorae. — Petals usually distinct, and stamens 

 perigynous or epigynous. Exceptions. — The petals are absent in 

 some Kosacece, Uiiagracea:, Lyihariea, Saxifragacece, Haloragece, 

 and Loraiithaceas. The petals cohere more or less in some 

 Aquifoliacece, Ciicurbitacece and Crassnlacea. The stamens are 

 hypogynous in some Saxifragacea:, in Droseracea, and are epi- 

 petalous in some Crassulacece. 



* Stamens and petals mostly perigyiious {except in the Crassulacece, 

 Ciicurbitacece, and Ribesiacece families'). 



XXII. AquifOLIACE/K (fig. 223). Shrubs or trees with small 

 flowers. Petals shortly united at the base. Stamens alternating 

 with them. No disli. Ovary syncarpous, fi'ee. 



XXIII. Celastrace^ (fig. 224). Shrubs or trees, with small 

 regular green flowers. Stamens alternating with the petals, on a 

 disk lining the base of the calyx. 



XXIV. RhamnacE/E (figs. 225-6). As in Celastraceae, but the 

 stamens are opposite the sinall concave or scale-like petals. 



XXV. Papilionace/E, a tribe of Leguminos^ (figs. 227-97). 

 Flowers very irregular, papilionaceous. Stamens 10, all, or 9 of 

 them, coinbined. Ovary of one carpel. 



XXVI. RoSACE/E (figs. 298-341). Flowers regular; Stamens 

 indefinite. Ovary (at least when >oung) apocarpous. 



XXVII. Onagrace^ (figs. 342-54). Perianth in twos or fours. 

 Stamens definite. Ovary inferior. One style. 



XXVIII. Lytharie^ (figs- 355-7)- Stamens usually definite, 

 inserted with the petals at the top of the calyx-tube. Ovary 

 syncarpous within the base of the tube. One style. Lower leaves 

 opposite. 



XXIX. CuburbitacEjE (fig. 358). Climbers with tendrils. 

 Flowers unisexual. Ovary inferior. 



XXX. Crassulacece (figs. 359-71). Leaves succulent. Sepals, 

 petals, stamens of one or two rows, and free carpels, all isomerous. 



XXXI. RibesiacEjE (figs. 372-5). Shrubs. Flowers regular. 

 Stamens definite. Ovary inferior. Placentas parietal. One style. 



XXXII. SaxifragacE/E (figs. 376-91). Flowers regular. 

 Stamens definite. Ovaiy syncarpous at the base, but a separate 

 style for each carpel. 



