TAXONOMY 
347 
which proceeds until, when plant is in fruit, there are formed io cavi¬ 
ties each enclosing a seed. Seeds, anatropous, mucilaginous, flat¬ 
tened, containing a large embryo and slight albumen. 
Official drug 
Linum 
Oeum Lini 
Part used Botanical name Habitat 
Seeds Linum usitatissimum ) Temperate 
Fixed oil Linum usitatissimum / regions 
Fig. 204.—Flax. A, floral diagram— c, calyx; co, corolla; s, stamens; p, pistil. 
B, median lengthwise section of flower. C, calyx and corolla removed. D, 
fruit, external view. E, cross-section of fruit. (Robbins.) 
Erythroxylaceos or Coca Family .—Shrubs ( Erythroxylon ) or trees 
with alternate, simple, entire, glabrous and pinnately veined leaves. 
Flowers regular, hermaphroditic, each with five sepals, five hypogy- 
nous petals, ten stamens and a two- to three-celled ovary subtend- 
