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FAMILIES OF FLOWERING PLANTS 185 
Piriqueta Caroliniana is a common plant of the Florida pine bar- 
rens, and resembles a rock-rose (Helianthemum) when its yellow flow- 
ers are expanded in the sunlight (see Fig. 164). The drug known as 
damiana is derived from a Mexican species of Turnera (TL. aphrodisiaca) 
and also from the West Indian 7. diffusa. 
Family Malesherbiaceae. Crownwort Family. Consists of the 
single genus Malesherbia, with about 15 species, natives of Peru and 
adjacent countries on the west coast of South America. They are 
herbs or low shrubs with alternate leaves and solitary yellow or blue’ 
flowers. The calyx is tubular, and merely 5-lobed, being gamosepalous: 
Fig. 165. Flower and leaf of Passifora foetida, showing the corona, and the finely dissected 
bracts surrounding the flower, Original. 
(not divided into distinct sepals). The petals are 5, persistent; sta- 
mens 5-10, their filaments often connected with the 3 styles, forming a | 
column; ovary borne on a stalk, 1-celled; fruit a 3-valved capsule. 
These plants are closely allied to the true passion-flowers, and were 
formerly included in the same family. 
Family Passifloraceae. Passion-flower Family. Contains 15 gen- 
era and about 300 species, of wide distribution, mostly in tropical 
regions. Of these, Passiflora, with about 250 species, is by far the 
most important. The plants are herbs or shrubs, often climbing, 
with alternate leaves and mostly solitary flowers. The calyx is. 
5-lobed; the petals 5, frequently clothed on their upper surfaces 
with small processes or filaments; stamens 5, monadelphous; 
