154 SUMMER FLOWERS. 



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

 rangular. 



21. Crassulaceous Plants. CRAssuLACEiE. 



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



(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 ; hjpo- 

 gynous scales concave. 



(94) Seduin — 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. Saxifragaceous Plants. Saxifragace^. 



* Stamens ten. 



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



two, persistent, forming two beaks to the carpels. 



** Stamens Jive. 



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



deeply bifid ; capsule one-celled, 3-5-valved, many-seeded. 



23. Ljrfchraceous Plants. Lythrace^. 



(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 teetVi ; petals six, 



minute, fugacious ; style very short. 



