170 SOUTH AFRICAN BOTANY 
Floral formula may be written KnCnAn + nGn (see 
p. 90), where ‘‘n”’ represents any number from 3 to 30. 
Stamens may equal or double number of petals; usu- 
ally obdiplostemonous. If only one whorl of stamens, 
formula is KnOnAo + nGn. Corolla may be gamo- 
petalous. Flowers usually perigynous. Gynoecium is 
apocarpous, usually a nectary at base of each ovary. 
Fruit is a group of follicles. 
Type.—Crassula (figs, 92-93). 
Fia. 93.—Crassula Centauroides, Thumb. I. Flower (Xa), II. Dia- 
gram of Flower. 
Plant.—Succulent herb, perennating by means of a rhizome. 
Leaves.—Decussate, simple, thick and fleshy, connate in some 
species. 
Inflorescence. —A dichasium. 
Flower.—Regular, complete. 
Calyx.—Polysepalous, 5 sepals, inferior. 
Corolla,—Polypetalous, 5 petals, perigynous. 
Androecitum.—Polyandrous, 5 stamens. 
Gynoectum.—Apocarpous, 5 carpels, superior. Ovaries each 
one-celled, containing numerous ovules with marginal placen. 
tation. 
Fruit.—A collection of 5 follicles, 
