FAMILIES OF FLOWERING PLANTS 119 
Family Droseraceae. Sundew Family. Another interesting fam- 
ily, with a somewhat peculiar geographical distribution. There are six 
genera; Drosera, with about 110 species, occurs in temperate and sub- 
tropical regions of both hemispheres, being particularly abundant in 
Australia; Dionea is a monotypic genus, restricted to a limited area 
along the coast of North and South Carolina; Aldrovandra, another 
monotypic genus of south Europe and Asia; Byblis, with two Australian 
Fig. 104. Thread-leaved sundew (D. filiformis). After Berry in Asa Gray Bulletin, Vol. V. No. 5. 
species; Roridula, with two South African species; and Drosophyllum, a 
monotypic half-shrubby genus of Portugal. With the latter exception, 
the plants are marsh or aquatic herbs, glandular-pubescent, and exud- 
ing a viscid secretion; they are mostly scapose, the leaves in a tuft or 
cluster at base. The flowers aresolitary or racemose, with a 4-5-parted 
persistent calyx and 5 hypogynous petals; stamens 5-20; ovary 1-3- 
celled, the style often cleft or divided (see Fig. 103). 
