246 ANONACEAE RANUNCULACEAE 
in 2 series. Stamens from 3 to 15. Carpels also from a few to 
several. Only a single species in our region. 
A. triloba, (L.) Dunal. (Figs. 3 and 4, pl. 43.) Norra AMERICAN 
Paraw. Tree found only in the southern part of our region. Flowers 
dull purple, petals 3 or 4 times as long as sepals. 
1. Section of a flower of Buttercup showing the arrangement of calyx, petals, 
stamens and the numerous carpels (achenes), which are arranged about the re- 
ceptacle. 2. The cluster of achenes on the receptacle with a single stamen, which 
is seen to arise from a ring at the foot oi! the receptacle. 3. A single achene cut 
lengthwise to show the single seed. 4. A group of achenes of Hepatica above the 
three bracts of the involucre. 5. Flower of Ranunculus bulbosus, showing the re- 
flected sepals. 6. A group of follicles with a single stamen arising from the base 
of the receptacle. 7. Leaf of Ranunculus bulbosus. 8. Leaf of R. acris. 9. A 
follicle partly opened showing the double row of seeds. to. Section of a flower 
of Thalictrum showing stamens, carpels and small sepals, much enlarged. 11. Clus- 
ter of berries of Actea. 12. Flower of Myosurus. 
FamMiIty V.—RANUNCULACEAE. Tur Crowroot Famity 
(Numerals in brackets refer to figures above.) 
A large and important family with a great variety of forms. 
All of our species are herbs with the exception of those of Clem- 
atis and Atragene, which are climbing vines and NXanthorrhiza 
