154 SUMMER FLOWERS. 



cleft, with three external scales at its base, the tube quad- 

 rangular. 



21. Crassulaceous Plants. CRASSULACEJE. 



* Stamens as many as the petals, alternating with tliem. 



(92) Tillsea sepals, petals, stamens, and carpels three or four. 



** Stamens twice as many as the petals, and opposite to them. 



(93) Cotyledon sepals five ; petals cohering in a tubular five- 



cleft corolla ; stamens ten, inserted on the corolla ; hypo- 

 gynous scales concave. 



(94) Sedum sepals and petals five, rarely four, distinct ; stamens 



ten, rarely eight ; hypogynous scales entire. 



(95) Sempervivum sepals and petals 6-20, usually 10-12; 



stamens twice as many ; hypogynous scales laciniated. 



22. SaxifragaceoilS Plants. SAXIFRAGACE.E. 



* Stamens ten. 



(96) Saxifraga calyx five-cleft or five-parted ; petals five ; styles 



two, persistent, forming two beaks to the carpels. 



** Stamens five. 



(97) Drosera calyx deeply five-cleft; petals five; styles 3-5, 



deeply bifid ; capsule one-celled, 8-5-valved, many-seeded. 



23. Lythraceous Plants. LYTHRACE^E. 



(98) Lythrum calyx tubular, cylindrical, with 8-12 teeth ; 



petals 4-6, longer than the calyx teeth ; style filiform. 



(99) Peplis calyx campanulate, with twelve teeth ; petals six, 



minute, fugacious ; style very short. 



