EUPHORBIACE^. 197 



oblique at the base. Peduncles in dense lateral clusters. 

 Glaiids of the involucre with reddish petal-like attachments. 

 Pods sharply angled. Roadsides. 



5. E. hyperieifo'lia, L. Stem ascending. Leaves ser- 

 rate, often with a red spot or with red margins, oblique at 

 the base, ovate-oblong or oblong-linear. Peduncles in cymes 

 at the ends of the branches. Glands of the involucre with 

 white or occasionally reddish petal-like attachments. Pcd 

 smooth, obtusely angled. Cultivated soil. 



6. E. COPOlla'ta, L. Conspicuous for the 5 bright-white 

 false lobes of the involucre, resembling petals ; the true lobes 

 very small. Gravelly or sandy soil. 



* * Involucres chiefly in terminal umbels, and their glands always 

 ^v^thout petal-like attachments. Leaves without stipules or blotches, 

 those of the stem alternate or scattered, the floral ones usually of a 

 different shape, and whorled or opposite. 



7. E. platyphyl'la, L. Umbel 5-rayed. Stem erect, 8-18 

 inches high. Upper stem-leaves lance-oblong, acute, serru- 

 late, the uppermost heart-shaped, the floral ones triangular- 

 ovate and cordate. Pod warty. Shores of the Great Lakes. 



8. E. Helioseo'pia, L. Umbel first 5-rayed, then with 

 3, and finally merely forked. Stem ascending, 6-12 inches 

 high. Leaves all obovate, rounded or notched at the apex, 

 serrate. Pods smooth. Along the Great Lakes. 



9. E. Cyparis'sias, L., with densely clustered stems, and 

 crowded linear stem-leaves (the floral ones round heart- 

 shaped), and a many-rayed umbel, has escaped from gar- 

 dens in some localities. 



10. E. Peplus, L., has the umbel 3-rayed, then forking. 

 Glands long- horned. Seeds ash-coloured, 2-grooved on the 

 inner face, and pitted on the back. Bather rare, waste 

 places. 



2. t iLY'PIIA, L. THREE-SEEDED MERCURY. 



A. Virgln'iea, L. Flowers monoecious, both kinds hav- 

 ing a calyx, the staminate 4-parted, the pistillate 3-5- 

 parted ; no involucre. Staminate flowers very small, in 

 spikes, with 1-3 pistillate flowers at the base, in the axil of 



