712 EUPHORBIACEAE 



1.5 mm. high, about as long as the peduncles, glabrous : glands fully 0.5 mm. broad ; ap- 

 pendages colored, undulate : capsules 1.5-2 mm. in diameter. 

 In sand, southern peninsular Florida. Spring to fall. 



25. Chamaesyce villifera (Scheele) Small. Annual, villous. Stems erect or as- 

 cending, 0.5-3 dm. tall, forking, slightly zigzag : leaf -blades ovate or triangular-ovate, 3-6 

 cm. long, obtuse or acutish, entire, truncate or subcordate at the oblique base, short-petioled : 

 involucres campanulate, 1 mm. long, longer than the peduncles : glands minute ; append- 

 ages white or rose-colored, oval or cuneate, 3-4 times longer than the width of the glands : 

 capsules 3-lobed, 2 mm. broad, 1.5 mm. high, the angles rather acute : seeds ovoid, less than 

 1 mm. long, transversely wrinkled. [Euphorbia viUifera Scheele.] 



In dry soil, Texas. Spring to fall. 



26. Chamaesyce Staiifieldii Small. Annual, sparingly villous or glabrate. Stems 

 forking above, sometimes branched at the base, slender and wiry, slightly zigzag : leaf- 

 blades triangular or ovate-triangular, 5-8 mm. long, serrate, sometimes slightly auricled 

 on one side of the very oblique usually truncate base, short-petioled : involucres campanu- 

 late, about 1 mm. high, usually longer than the peduncles, glabrous, ribbed : glands 0.2-0.3 

 mm. broad ; appendages minute, white, petal -like, longer than broad : capsules about 1.5 

 mm. high, sharp-angled, glabrous : seeds ovoid, about 1 mm. long, with few shallow trans- 

 verse wrinkles. 



In dry soil, southern Texas. Summer and fall. 



27. Chamaesyce Blodg6ttii (Engelm. ) Small. Annual or biennial, glabrous or 

 nearly so. Stems branched at the base, the branches few or numerous, 1-4 dm. long, fork- 

 ing, prostrate : leaves numerous ; blades oblong or nearly so, 3-8 mm. long, minutely serrate 

 near the apex, oblique at the base, manifestly petioled : involucres campanulate, less than 

 1 mm. high, short-peduncled : glands minute, elevated ; appendages irregular, white or 

 slightly colored : capsules 1.5 mm. high, about as broad, glabrous, the angles rather sharp : 

 seeds about 1 mm. long, gray, 4-angled, the faces faintly transversely wrinkled. [Euphorbia 

 Blodgettii Engelm.] 



In sand, Florida Keys. Spring to winter. 



28. Chamaesyce serpyllifolia (Pers. ) Small. Annual, dark green, or becoming 

 reddish, glabrous. Stems branched from the base, the branches slender, prostrate or 

 ascending, 1-4 dm. long : leaf-blades oblong to spatulate, 3-12 mm. 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 bristles : involucres solitary in 

 the axils, sometimes clustured toward the ends of the branchlets, over 1 mm. long : glands 

 4, disk-like ; appendages narrow, lobed : capsules 2 mm. broad, slightly nodding : seeds 

 ovoid, hardly 1 mm. long, 4-angled, the faces transversely wrinkled and pitted. [Euphor- 

 bia serpyllifolia Pers. ] 



In dry soil, Wisconsin to California and Mexico. Spring to fall. 



29. Chamaesyce glyptosp6rma ( Engelm. ) Small. Annual, pale green, glabrous. 

 Stems branched near the base, the branches ascending, spreading or prostrate, 440 cm. 

 long : leaves numerous ; blades oblong, linear-oblong or rarely ovate, 2-12 mm. long, 

 more or less falcate, obtuse at the apex, inequilateral, serrulate, very oblique and obtuse or 

 subcordate at the base, short-petioled ; stipules becoming fringed : involucres solitary in 

 the axils, or often clustered, campanulate, fully 1 mm. long, with 4 dark ribs : glands 4, 

 saucer-shaped ; appendages narrow, crenulate, or slightly lobed : capsules depressed- 

 globose, less than 2 mm. in diameter, nodding : seeds oblong, 1 mm. long, ash-colored, 

 strongly transversely wrinkled, not pitted. [Euphorbia glyptosperma Engelm. ] 



In sandy soil, Ontario to British Columbia, Texas and Mexico. Spring to fall. 



30. Chamaesyce nutans (Lag.) Small. Annual, glabrous or sparingly pubescent. 

 Stems branched, at least above, ascending or erect, 1.5-6 dm. high, the branches mostly 

 spreading, and 2-ranked, often recurved at the ends, the flowering branches slender : leaf- 

 blades oblong or linear-oblong, varying to ovate or obovate, often falcate, oblique, 

 3-nerved, unequally serrate, often with a red blotch and red margins, short-petioled ; 

 stipules slightly lacerate : involucres narrowly obovoid, 1 mm. long, one-half or one third 

 as long as the peduncles : glands 4 ; appendages orbicular or reniform, entire, white or red : 

 capsules glabrous, fully 2 mm. in diameter : seeds oblong-ovoid, 1.5 mm. long, 4-angled, 

 brown or nearly black under a grayish coat, transverse-ridged. [Euphorbia nutans Lag.] 



In fields and thickets, throughout eastern North America, except the extreme north, extending 

 west to the Rocky Mountains. Spring to fall. 



31. Chamaesyce Brasili6n*is ( Lam. ) Small. Similar to C. nutans in habit. Stems 

 sometimes woody at the base, the flowering branches filiform : leaf-blades more finely 

 toothed : capsules usually less than 2 mm. in diameter : seeds commonly about 1 mm. long, 

 black or nearly so. [Euphorbia Brasiliensis Lam.] 



In waste places and dry soil, Gulf States to Mexico and tropical America. Spring to winter. 



