EUPHORBIACEAE 709 



3. Chamaesyce Geyeri (Engelin. ) Small. Annual, olive-green, glabrous. Stems 

 branched at the base, the branches radially spreading, prostrate, 0.5-4 dm. long, forking, 

 wiry: leaf-blades oblong to ovate, 4-12 mm. long, obtuse, usually mucronulate, entire, 

 mostly truncate or subcordate at the base, short-petioled : involucres turbinate, 1.5 mm. 

 high, usually longer than the peduncles : glands about 0.3 mm. broad ; appendages incon- 

 spicuous, white or red : capsules globose-reniform, about 2 mm. high : seeds narrowly 

 ovoid, 1.5 mm. long, nearly terete, ash-colored. [Euphorbia Geyeri Engelm. ] 



On plains or prairies, Minnesota to Illinois, Kansas and the Indian Territory. Summer and fall. 



4. Chamaesyce ammannioides (H.B.K. ) Small. Annual, glabrous. Stems branched 

 at the base, the branches prostrate, very slender, 3-9 dm. long, the ultimate divisions 

 nearly filiform : leaf-blades oblong, 4-6 mm. long, obtuse or abruptly pointed, entire, 

 oblique at the base, slender-petioled : involucres campanulate, barely 1 mm. high, shorter 

 than the peduncles : glands transversely oblong, 0.5 mm. broad ; appendages whitish, rep- 

 resented by mere borders : capsules depressed, about 2-2.5 mm. broad, smooth : seeds ovoid, 

 1 mm. long, smooth. [Euphorbia amnuinnioides H.B.K.] 



In sand, southern peninsular Florida. Spring to winter. 



5. Chamaesyce Nishii Small. Annual or biennial, glabrous, rather fleshy. Stems 

 branched at the base, the branches prostrate, 2-5 dm. long, forking, relatively stout : leaves 

 sometimes numerous on the branches ; blades broadly oblong, varying to slightly broadest 

 above or below the middle, 3-8 mm. long, inclined to be truncate or retuse at the apex, 

 entire, obtuse or truncate at the oblique base : involucres turbinate-campanulate, nearly 

 1.5 mm. high, glabrous, longer than the peduncle : glands nearly 0.3 mm. broad ; append- 

 ages narrow, delicate, entire or undulate : capsules fully 1.5 mm. high, glabrous : seeds 

 oblong-ovoid, about 1 mm. long, the faces with shallow transverse wrinkles. 



On sandy beaches, peninsular Florida and the Keys. Spring to winter. 



6. Chamaesyce Chidgenes Small. Annual or biennial, deep green, glabrous. Stems 

 branched at the base, the branches prostrate, wiry, 1-3 dm. long, forking, with rather 

 long internodes : leaves rather few ; blades often becoming parchment-like, oval, ovate or 

 oblong, 3-8 nnn. long, acute or obtuse, and entire, or broadly oval or suborbicular and 

 toothed, inequilateral, manifestly petioled : involucres turbinate-campanulate, about 1 mm. 

 high, short-pedimcled : glands minute ; appendages mere white or pale borders : capsules 

 fully 1 mm. high, glabrous, the angles rather sharp : seeds about 1 mm. long, 4-angled, the 

 faces uneven. 



In sand, Florida Keys. Throughout the year. 



7. Chamaesyce serpens (H.B.K.) Small. Annual, pale green, glabrous, sometimes 

 glaucescent. Stems branched at the base, the branches slender or filiform, prostrate, 5-30 

 cm. long : leaf-blades orbicular, orbicular-ovate or oval, 2-6 mm. long, obtuse or emarginate, 

 entire, often slightly revolute-margined, short-petioled, the base oblique, rounded or sub- 

 cordate ; stipules ti'iangular, somewhat toothed at the apex : peduncles slightly longer than 

 the petioles : involucres solitary in the axils, nearly 1 mm. high : glands 4, sessile, saucer- 

 shaped, shorter than the involucre-lobes ; appendages minute, irregular, crenulate : capsules 

 nodding, depressed-globose, 2 mm. broad : seeds oblong-ovoid, 1 mm. long, smooth, ob- 

 tusely 4-angled, light gray. [Euphorbia serpens^ T:l.^.^.'\ 



On prairies, Iowa to Illinois, Kansas and Mexico. Spring to fall. 



8. Chamaesyce cordifolia (Ell. ) Small. Annual, glabrous. Stems branched at the 

 base, the branches spreading or prostrate, 1-5 dm. long, forking, often diffuse : leaf-blades 

 broadly oblong to oval or sometimes slightly broadest below the middle, obtuse, entire, 

 manifestly petioled : involucres campanulate, 1 mm. high, shorter than the peduncles : 

 glands transvei-sely oblong ; appendages white, orbicular or ovate, 0.8 mm. long: capsules 

 broader than high, 1.5 mm. high, the angles sharp : seeds ovoid, 1 mm. long, smooth, 

 obscurely 4-angled. [Euphorbia cordifolia Ell.] 



In sand. South Carolina to Florida and Texas. Summer and fall. 



9. Chamaesyce brachypoda Small. Annual, hirsute or villous-hirsute. Stems 

 often branched at the base, the branches spreading, prostrate, 1-3 dm. long, forking, barely 

 zigzag, the branchlets 1-2 cm. long, with many joints : leaf-blades oblong to ovate, 2-7 

 mm. long, obtuse, hirsute, entire, thick, very oblique, short-petioled : involucres fully 1 

 mm. high, campanulate, hirsute, longer than the peduncles : glands red, about 0.5 mm. 

 broad ; appendages very narrow, entire or obsolete : capsules fully 1 mm. long, globose- 

 ovoid, copiously pubescent, acute-angled : seeds less than 1 mm. long, nearly smooth. 



In sand, southern peninsular Florida. Spring to fall. 



10. Chamaesyce Lared^na ( Millsp. ) Small. Annual, viscid-villous with white hairs. 

 Stems branched at the base, the branches numerous, 0.5-3 dm. long : leaf-blades ovate 

 or oval-ovate, 2-5 mm. long, obtuse, entire, lanate, cordate at base : involucres campanulate, 



