710 EUPHOKBIACEAE 



sessile, completely clothed with white hairs : glands 4, somewhat elongated transversely, 

 the appendages obsolete : capsules slightly depressed, 1.5-2 mm. broad, glabrous near the 

 base, the lobes keeled : seeds sharply 4-angled, the faces with 4-6 transverse ridges. 

 [Euphorbia Laredana Millsp.] 



In dry soil, near Laredo, southern Texas. Spring and summer. 



11. Chamaesyce GArberi (Engelm. ) Small. Annual or biennial, finely canes- 

 cent. Stems widely branched, sometimes from the base, the branches spreading or ascend- 

 ing or decumbent, 1-4 dm. long, more or less zigzag : leaf-blades ovate or oval, 4—10 mm. 

 long, apiculate, entire, oblique at the base, short-petioled : involucres solitary or few in 

 clusters, campanulate, about 1 mm. high, as long as the peduncle or longer : nearly gla- 

 brous : glands transversely oblong, 0.4 mm. broad; appendages mere narrow dentate 

 borders : capsules slightly broader than high, 1.5 mm. high, the angles rather sharp, spar- 

 ingly pubescent all over : seeds reddish brown, barely 1 mm. long, with indistinct transverse 

 wrinkles. [Euphorbia Garben Engelm. ] 



In sand, Florida and Alabama. Spring to winter. 



12. Chamaesyce cinerdscens (Engelm.) Small. Annual or biennial, finely canes- 

 cent. Stems branched at the base, the branches spreading or prostrate, 0.5-2 dm. long, 

 slender, forking : leaves numerous ; blades suborbicular to ovate or oval-oblong, .3-6 mm. 

 long, obtuse, entire, truncate at the base, short-petioled : involucres turbinate-campanulate, 

 less than 1 mm. high, pale, stout-peduncled : glands minute, often purple, nearly naked ; 

 appendages minute or obsolete : capsules fully 1 ram. high, a little broader, pubescent, 

 the angles sharp : seeds pale gray, oblong, about 1 mm. long, sharply 4-angled, the faces 

 prominently wrinkled transversely. [Euphorbia cinerascens Engelm.] 



In dry soil, Texas and adjacent Mexico. Spring to fall. 



13. Chamaesyce deltoidea (Engelm. ) Small. Perennial, nearly glabrous. Stems 

 more or less diffusely branched at the base, the branches slender, zigzag, 5-10 cm. long, 

 usually wiry : leaf-blades thickish, deltoid-ovate or reniform, 1.5-3 mm. long, obtuse or 

 refuse, oblique, slightly revolute, short-petioled : involucres globose-campanulate, less 

 than 1 mm. long, as long as the peduncles or shorter : glands transversely oblong, minute, 

 0.3 mm. broad ; appendages obsolete : capsules barely 1 mm. long, smooth and glabrous : 

 seeds minute. [Euphorbia deltoidea Engelm.] 



In sand, southern peninsular Florida. Spring to winter. 



14. Chamaesyce albomarginata (T. & G. ) Small. Perennial, glabrous. Stems dif- 

 fusely much branched from the base, the branches wire-like, 2-15 cm. long, sometimes 

 very numerous : leaf -blades suborbicular or ovate-orbicular, 4-8 mm. long, obtuse or 

 acutish, entire, truncate or subcordate at the base, manifestly petioled : involucres campan- 

 ulate, fully 1 mm. high, as Ion? js the peduncles or shorter : glands transversely oval, 

 about 0.5 mm. wide ; appendages white, petal-like, fan-shaped, 1.5-2 mm. broad, entire or 

 crenulate : capsules globose-ovoid, 2 mm. long, sharply 3-angled : seeds oblong-ovoid, 

 1-1.3 mm. long. [Euphorbia albomarginata T. & G.] 



In dry soil, Texas to California. Spring to fall. 



15. Chamiaesyce F6ndlerl (T. & G. ) Small. Annual (or perennial by a woody 

 root), pale green, glabrous. Stems diffusely branched from the base, the branches spread- 

 ing, wiry, 1-2 mm. long, brittle : leaf-blades suborbicular, oval or elliptic, 3-8 mm. long, 

 obtuse, entire, short-petioled, the base oblique, obtuse or subcordate ; stipules usually a 

 fringe of short bristles : involucres solitary in the axils, sometimes clustered toward the 

 ends of the branches, campanulate, 2-5 mm. high : glands saucer-shaped, oval ; appen- 

 dages irregular, entire or slightly lobed : peduncles about^as long as the involucres : cap- 

 sules deflexed, 3 mm. in diameter, sharply 3-lobed : seeds ovoid, 1.5 mm. long, trans- 

 versely wrinkled. [Euphorbia FendleriT. &G. ] 



On plains or prairies, Nebraska and Colorado to Texas, Mexico and Arizona. Spring to fall. 



16. Chamaesyce adicioides Small. Perennial, shrubby, finely pubescent with pale 

 hairs. Stems ascending, 2-4 dm. tall, rather copiously branched above, zigzag, sometimes 

 1 cm. thick at the base : leaves numerous ; blades ovate to oval, 2-3 mm. long, acute or 

 acutish, entire, short-petioled : involucres campanulate, barely 1 mm. high, longer than 

 the peduncles, minutely pubescent, deciduous : glands about 0.4 mm. broad : appendages 

 obsolete : capsules pubescent, less than 1 mm. long. 



In sand or coral rock, Florida. Spring to winter. 



17. Chamaesyce lata (Engelm. ) Small. Perennial, pale green, canescent. Stems 

 branched from the somewhat woody base, the branches spreading or ascending, 5-10 cm. 

 long: leaf-blades ovate to lanceolate, 5-10 mm. long, revolute-margined, abruptly nar- 

 rowed, truncate or cordate at the base, short-petioled ; stipules obsolete, or of a few short 



