396 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Range: Utah to Arizona and New Mexico. 



New Mexico: Ramah; San Lorenzo; Magdalena Mountains; Horse Camp; Tunitcha 

 Mountains; "Willow Creek, Rio Arriba Count}'. Meadows. 



6. Tithymalus chamaesula (Boiss.) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 

 145. 1913. 



Euphorbia chamaesula Boiss. Cent. Eupborb. 38. 1860. 



Type locality: Near the Copper Mines, New Mexico. Type collected by Wright 

 (no. 1820). 



Range: Arizona and New Mexico and adjacent Mexico. 



New Mexico: Mogollon Mountains, and south to the Mexican boundaiy. Tran- 

 sition Zone. 



6. Tithymalus montanus (Engelm.) Small; Rydb. Colo. Agr. Exp. Sta. Bull. 100: 

 224. 1906. 



Euphorbia montana Engelm. in Torr. U. S. & Mex. Bound. Bot. 192. 1859. 



Euphorbia montana gracilior Engelm. loc. cit. 



Type locality: Near Santa Fe, New Mexico. Type collected by Fendler (no. 786). 



Range: Utah and Colorado to Arizona and western Texas. 



New Mexico: Farmington; Sandia ]\Iountains; Chama; Santa Fe and Las Vegas 

 mountains; Black Range; San Luis Mountains; White and Sacramento mountains. 

 Meadows, in the Transition Zone. 



The type of E. montana gracilior was collected near Santa Fe (Fendler 786, in part). 



3. TITHYMALOPSIS Klotzsch & Garcke. 



Slender glabrous perennial herb with erect stems and oblong-linear alternate leaves; 

 involucres on pubescent pedicels 3 to 5 mm. long, clustered; glands sessile or stalked, 

 with yellowish white appendages; capsule exserted; seeds narrowed upward, more or 

 less punctate, without caruncles. 



1. Tithymalopsis strictior (Holzinger) Woot. & Standi. 



Euphorbia strictior Holzinger, Contr. U. S. Nat. Herb. 1: 214. pi. 18. 1892. 



Type locality: Oldham County, Texas. 



Range: Texas to eastern New Mexico. 



New Mexico: Tucumcari Mountain; Nara Visa. Plains and hills, in the LTpper 

 Sonoran Zone. 



4. DICEHOPHYLLTJM Klotzsch & Garcke. Snow-on-the-mountain. 



Annual with erect stems umbeilately branched above, 40 to 80 cm. high; leaves alter- 

 nate or opposite, sessile, ovate, entire, acute, about 5 cm. long, those of the inflorescence 

 broadly white-margined, attenuate below into a short petiole; flowers crowded at the 

 summit of the stem; involucres campanulate, in rather dense cymes, the lobes fimbri- 

 ate, the 5 glands peltate, somewhat concave, with pink and white petal-Like append- 

 ages; capsule exserted, pubescent; seeds narrowed upward, carunculate. 



1. DichrophyUura marginatum (Pursh) Klotzsch & Garcke, Monatsb. Preuss. 

 Akad. Wiss. Berlin 1859: 249. 1859. 



Euphorbia marginata Pursh, Fl. Amer. Sept. 607. 1814. 



Tithymalus marginatus Cockerell, Univ. Mo. Stud. Sci. 2^: 165. 1911. 



Type locality: "On the Yellow-stone river." 



Range: Montana and Minnesota to New Mexico and Texas. 



New Mexico: Frio Draw; Tucumcari; Red Lake east of Elida; Albert; Roswell. 

 Plains, in the Upper Sonoran Zone. 



A showy plant, not rare in cultivation. It is easily recognized by the white- 

 margined floral leaves. 



