This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Euphorbia stictospora Engelm. Bot. Mex. Bound. Surv. 187. 1859.
C. stictospora Small, Fl. SE. U. S. 714. 1903.
Annual, yellowish green, pilose throughout. Stem branched from the base, the branches ascending, or radiating, 2'-12' long; leaves oblong to suborbicular, 2"-3" long, obtuse, dentate-serrate at the apex, short-petioled, the bases truncate or subcordate; stipules fringed; involucres clustered, campanulate, i" high, with 4 cup-shaped glands subtended by inconspicuous crenate appendages; peduncles at length longer than the involucres; capsule ovoid, 1/2"-1" in diameter; seeds narrowly ovoid, 1/2" long, pointed, pitted, gray or ash-colored, sharply 4-angled.
Plains, hills and prairies. South Dakota to Nebraska, Kansas, Colorado and Mexico. June-Oct.
Euphorbia humistrata Engelm.; A. Gray, Man. Ed. 2, 386. 1856. C. humistrata Small, Fl. SE. U. S. 713. 1903.
Annual, light green, puberulent or sparingly-pilose. Stem branched from the base, the slender branches radiately spreading, prostrate or ascending, 4'-12' long; leaves ovate-oblong or obovate-oblong, or sometimes narrower, 2"-7" long, serrulate, at least above the middle, oblique, obtuse or subcordate at the base, short-petioled; stipules at length fringed; involucres in lateral clusters, split on one side, i" long, faintly nerved, with 4 disk-like glands, each subtended by a narrow irregular red or white appendage; capsule depressed-globose, less than 1" in diameter, its 3 lobes keeled; seeds oblong, 1/2" long, papillose, obscurely transversely wrinkled.
13. Chamaesyce maculata (L.) Small.
Milk Purslane. Spotted or Blotched Spurge. Fie:. 2744.
Euphorbia maculata L. Sp. Pl. 455. 1753. Chamaesyce maculata Small, Fl. SE. U. S. 713. 1903.
Annual, dark green, puberulent or pilose. Stem branched from the base, the branches slender, radiately spreading, prostrate, 2'-15' long, often dark red; leaves usually blotched, oblong or ovate-oblong, 2"-8" long, obtuse, more or less serrate, short-petioled, the base oblique, subcordate; stipules a fringe of setae; involucres solitary in the axils, entire, 1/2" long, with 4 cup-shaped glands, the appendages narrow, white or red, crenulate; peduncles shorter than the involucres; capsule ovoid-globose, about 1" in diameter, pubescent; seeds ovoid-oblong, obtusely angled, minutely pitted and transversely wrinkled.
Dry soil, New England to Ontario, Wyoming, Florida and Texas. California. Apparently introduced west of the Rocky Mountains. Spotted or black pusley. Black spurge. Spotted eyebright. Milkweed. June-Nov.