7. Chamaesyce Lata (Engelm.) Small. Hoary Spurge

Fig. 2738

Euphorbia lata Engelm. Bot. Mex. Bound. Surv. 188.

1859. Chamaesyce lata Small, Fl. SE. U. S. 710. 1903.

Perennial, pale green, canescent all over. Stem branched from the somewhat woody base, the branches spreading or ascending, 2-4' long; leaves ovate to lanceolate, 2 1/2"-5" long, revolute-mar-gined, abruptly narrowed, truncate or cordate at the base, short-petioled; stipules obsolete or of a few short setae; involucres solitary in the axils, 1/2" long, short-peduncled, bearing 5 disk-like glands subtended by narrow undulate appendages; capsule subglobose, 1" in diameter; seeds oblong, 3/4" long, acutish at both ends, 4-angled, the faces inconspicuously transversely wrinkled.

Kansas to Colorado, Texas and New Mexico. April-Aug.

8. Chamaesyce Serpyllifòlia (Pers.) Small. Thyme-Leaved Spurge

Fig. 2739

Euphorbia serpyllifolia Pers. Syn. 2:14. 1807. Chamaesyce serpyllifolia Small, Fl. SE. U. S. 712. 1903.

Annual, dark green, or becoming reddish, glabrous. Stem branched from the base, the slender branches prostrate or ascending, 4'-12' long; leaves oblong to spatulate, 1 1/2"-6" long,* obtuse or retuse, nearly entire, or serrulate to below the middle, short-petioled, the base oblique, mostly truncate or obtuse; stipules at length a fringe of weak setae; involucres solitary in the axils, sometimes clustered toward the ends of the branchlets, less than 1" long, bearing 4 disk-like glands each subtended by a narrow lobed appendage; capsule 1" broad, slightly nodding; seeds ovoid, hardly \" long, 4-angled, the faces transversely wrinkled and pitted.

In dry soil, Michigan and Wisconsin to South Dakota, Idaho, Washington, California, south to Missouri, Texas and Mexico. May-Sept.

3°

9. Chamaesyce Albicaùlis Rydb. White-Stemmed Spurge

Fig. 2740

Euphorbia albicaulis Rydb. Mem. N. Y. Bot. Gard. I: 266. 1900.

Chamaesyce albicaulis Rydb. Fl. Colo. 223. 1906.

Annual, pale green or yellowish. Branches procumbent, 4'-12 long, glabrous, shining; leaves linear or slightly broadened upward, 5"-7 1/2" long, toothed at the apex; involucres turbinate, about i" high; appendages minute, rather broad, white, truncate or crenulate; capsule about 1" long, smooth, acute-angled; seeds light gray, oblong, 3/4" long or less, acutely 4-angled, shallowly transversely wrinkled.

In sandy soil, Nebraska to Montana and New Mexico. June-Sept.

10. Chamaesyce Glyptospérma (Engelm.) Small. Ridge-Seeded Spurge

Fig. 2741

Euphorbia glyptosperma Engelm. Bot. Mex. Bound.

Surv. 187. 1859. C. glyptosperma Small, Fl. SE. U. S. 712. 1903.

Annual, pale green, glabrous. Stem branched toward the base, the branches ascending, spreading or prostrate, 2-15' long; leaves oblong, linear-oblong or rarely ovate, 1"-6" long, more or less falcate, obtuse at the apex, inequilateral, serrulate, very oblique and obtuse or subcordate at the base, short-petioled; stipules becoming a fringe of setae; involucres solitary in the axils, often clustered, campanulate, 1/2" long, with 4 dark ribs and 4 saucer-shaped glands, their appendages narrow, crenulate, or slightly lobed; capsule depressed-globose, less than 1" in diameter, nodding; seeds oblong, \" long, ash-colored, strongly transversely wrinkled, not pitted.

In sandy soil, Ontario to British Columbia, Maine, southeastern New York, Wisconsin, Iowa, Texas and Mexico. June-Oct.