PHARMACEUTICAL BOTANY 
3 2 ? 
rarely by enlargement of receptacle and slight fusion of sepals, 
perigynous. Pistil tri- to bicarpellate often three- to two-sided, 
ovary one-celled with one ovule. Styles three, rarely two, radiating 
penicillate in wind-pollinated inconspicuous flowers, becoming con¬ 
densed knob-like in conspicuous insect-pollinated flowers. Fruit a 
triangular or biconvex akene often crowned by persistent styles and 
surrounded by persistent closely applied sepals. Seeds solitary, 
albuminous, with straight embryo, or in Rumex, curved embryo. 
Pig. 182. —Rhubarb (Rheum) flower, external view, median lengthwise section, 
and with perianth and stamens removed. ( Robbins , after Liirssen.) 
Official drug Part used 
Botanical name Habitat 
Rheum officinale 
Rheum palmatum 
and the variety China and 
tanguticum and Thibet 
probably other 
species ' 
Rumex crispus 
Rumex 
obtusifolius 
Rheum 
Rhizome 
Rumex N.F. Root 
Unofficial 
Bistorta 
Rhizome 
Polygonum 
Bistorta 
Europe and Asia 
X. Order Chenopodiales ( Centrospermce).—Chenopodiacece or 
Goosefoot Family .—Usually herbaceous halophytes or shore growers, 
