Genus 14. 



SPURGE FAMILY. 



469 



I. Dichrophyllum marginatum (Pursh.) 



Kl. & Garcke. White-margined Spurge. 



Fig. 2748. 



Euphorbia marginata Pursh, Fl. Am. Sept. 607. 



1814. 

 Dichrophyllum marginatum Kl. & Garcke, Monatsb. 



Akad. Ber. 1859: 249. 



Annual, bright green, glabrous or pubescent. 

 Stem rather stout, erect, io'-3° tall, somewhat 

 channelled, usually pilose, topped by a mostly 

 3-rayed umbel; leaves except the whorl subtend- 

 ing the umbel, scattered, ovate to obovate, io"-3i' 

 long, entire, sessile ; rays of the umbel forked ; 

 bracts large, white-margined ; involucres cam- 

 panulate, often clustered, 2" long, usually pubes- 

 cent, bearing 3 glands subtended by white reni- 

 form appendages ; capsule depressed-globose, 3" 

 in diameter, usually pubescent, the lobes rounded ; 

 seeds ovoid-globose, terete, about 2" long, dark 

 ash-colored, reticulate-tuberculate. 



In dry soil, Minnesota to Colorado, south to 

 Texas. Introduced into waste places in the Central 

 and Atlantic States. Snow-on-the-mountain. Varie- 

 gated spurge. Mountain snow. May-Oct. 



15. TITHYMALOPSIS Kl. & Garcke, Monatsb. Akad. Ber. 1859: 249. 

 Perennial herbs, with tough rootstocks and glabrous or pubescent foliage. Stems soli- 

 tary or tufted, topped by several-rayed umbels. Leaves alternate or scattered below the 

 umbels, thence opposite or whorled, entire, more or less leathery, inclined to be revolute. 

 Involucres sessile or peduncled, few and remote, or in rather close clusters and numerous ; 

 lobes toothed or fimbriate Glands sessile or stalked, with white, pink or rose petal-like 

 appendages. Capsule exserted, sometimes conspicuously so, often broader than high ; lobes 

 rounded. Seeds narrowed upward, more or less conspicuously punctate, without caruncles. 

 [Greek, resembling Tithymalus.] 



About 18 species, natives of North America. Type species: Tithymalopsis coroUata (L.) 

 Kl. & Garcke. 



Involucres with conspicuous petaloid white or pinkish appendages. 



Stems simple below or nearly so, umbellately or paniculately branched above, i. T. coroUata. 

 Stems tufted or diffusely branched below, dichotomous above. 



Leaves linear-lanceolate to linear ; rootstock horizontal. 2. T. marylandica. 



Leaves ovate, oval or oblong ; rootstock perpendicular. 3. T. arundelana. 



Involucres with inconspicuous green appendages. 4. T. Ipecacuanhae. 



I. Tithymalopsis coroUata (L.) KL & 



Garcke. Blooming or Flowering 



Spurge. Fig. 2749. 



Euphorbia coroUata L. Sp. PI. 459. 175.I. 

 Tithymalopsis coroUata Kl. & Garcke, Monatsb. 



Akad. Ber. 1859 : 249. 



Perennial by a long stout rootstock, bright 

 green, glabrous or somewhat pubescent. Stem 

 erect, io'-3° tall, often spotted, usually simple; 

 umbellately or oaniculately branched above ; 

 leaves linear, oblong or oblong-spatulate, 10"- 

 20" long, entire, short-petioled or sessile, the 

 lower scattered, those subtending the umbel 

 verticillate ; rays of the umbel forked ; bracts 

 ovate to linear, green ; involucres mostly term- 

 inal, less than i" long, bearing 4 or S yellowish 

 green oblong glands subtended by white petal- 

 like cuneate or orbicular-cuneate appendages; 

 capsule erect, subglobose, i"-2" in diameter; 

 seeds ovoid, smooth, sparingly pitted. 



In dry soil, Ontario to Massachusetts. Minne- 

 sota, Kansas, Florida and Texas. April-Oct. 

 Ascends to 4200 ft. in North Carolina. Apple-, 

 bowman- or purging-root. Picac. Milk- or white 

 purslane. Milk-pusley or -ipecac. Milkweed. Snake- 

 milk. Wild hippo. Naturalized in its northeast- 

 ern range. 



