THE DICOTYLEDONS 513 
rarely to five, four, three to one (Kenigia), hypogynous, more 
rarely by enlargement of receptacle and slight fusion of sepals, 
perigynous, Pistil tri- to bi-carpellate, often three- to two- 
sided; ovary one-celled with one ovule. Styles three, rarely 
two, radiating penicillate in wind-pollinated, inconspicuous 
flowers, becoming condensed, knob-like in conspicuous insect- 
pollinated flowers. Fruit a triangular or biconvex akene often 
crowned by persistent styles and surrounded by persistent closely 
Nectar -& 
glands X 
Fic. 383,—Rhubarb (Rheum) flower, external view, median lengthwise section, 
and with perianth and stamens removed. (Robbins, after Luerssen.) 
applied sepals. Seeds solitary, albuminous, with straight 
embryo, or in Rumex, curved embryo. 
OrrIciAr Drug PART UsED _ Boranicar Origin Hasirat 
Rheum officinale 
Rheum palmatum and 
i other species (except- 
Rheum gran — ing R. rhaponticum) or China and Thibet 
ee : hybrids of Rheum, 
*{ grown in China and 
Thibet 
Unorricra, Drue 
Rumex crispus 
Rumex Root Rumex Europe 
obtusifolius 
Bistorta Rhizome Polygonum Bistorta Europe and Asia 
OrDER CHENOPODIALES OR CENTROSPERMZ 
This order contains seven families, all of which have seeds 
with a curved or coiled embryo. These families are the Goose- 
