BOTANY. 



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t lis elongato-linearibns revolutis iiitegris ; foliis floralihns Lasi paullo dilatatis pnniceis subiude 



clrciriatis ; glandulis 1-2 stipitatis cjatliiformibus compressis margine revoluto sa}pe crenulatis 

 involucri lobos laciniatos coloratos superantibiis ; stylis brevibus purpureiserectis longe connatis, 



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apice bifidis, stigmatibus acutis demum recurvis. Dry arroyaS; Aqua Zarco, Sonoraj May ; and 

 Santa Cruz, Sept.; Thurber^ d Gapt.E. K. Smith. Specimens incomplete, nearly a foot high. 

 Leaves 3-4 inches long^ scarcely more than a line wide ; floral leaves shorter and about 2 lines 

 wide, deep crimson. Distinguished from E. heterophylla by the narrow revolute leaves, etc. 

 Margin of involucre and styles also purplish. Capsule glabrous and seeds tuberculate, as in the 

 allied species. 



Euphorbia radians, Benth. PL Hartweg^ p. 38. Plains between San Bernardino and Santa 



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Cruzj Sonora, April ; Capt. E. K. Smith. Dry valleys near Buena Vista, Mexico; Dr, Gregg^ 

 Dn Wislizenus ; Mexico ; Berlandier^ (No. 116 and 1375.) Boot tuberous : flowers in early spring, 



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before the leafy shoots put out. 



Euphorbia eriantha^ Benth, Bot. Sulph. p. 51. Sonora ; Wright, (No. .1841 ?) 



§ IV. UMBELLATE. 



Euphorbia Wrightii, Torr. d Gray, Bot. Pope's Rep. On the San Felipe and the San Pedro 

 western Texas ; 1 Vr i ghi, {^o. 1S27^) 



Euphorbia multicaulis, (nov. spec.) ! annua sen biennis, multicaulis^ hurailis, erecta, glabra ; 

 foliis lineari-oblanceolatis acutis mucronatis serrulatis basi angustata sessilibus ; umbellis tri~ 

 fidis, ramis bifidis, bracteis lanceolatis, superioribus ovato-lanceolatis acutis ; involucri glandulis 

 tranverse ovatis'; stylis basi liberis ad medium sen ultra bifidis ; capsulte coccis dorso verrucosis ; 

 seminibus lenticularibus la3vibus fuscis. Sonora ; TUiirher. About a dozen stems form a taper- 

 ing root, 6 inches high, and wilh erect branches ; leaves 4-6 lines long, 1 line wide. Nearly 

 allied to E, obtusata. 



Euphorbia dicttosperma, Fisch, d Mey. Ind. Sem. Petrop. 1835. E. Arkansana, Engehn. 

 & Gray, PL Lindh. 1, p. 26. Western Texas ; Wright, Var, Mexicana : annua seu plerumque 

 biennis, e basi erecto-ramoso ; foliis versus apicem crenato-serratis, lobis involucri subintegris; 

 ovarii coccis dorso solum verrucosis. Valley of the Nagas, Balson de Mapimi, Dr. Gregg; 

 western Texas ; Wright^ (No. 1824.) y leiococca : capsulis l^vibus sea vix hinc inde verru- 

 culosis. Texas ; Drummond ; II. 327. Near the Colorado, of Texas; Wright. 



Euphorbia tetrapora (nov. spec): annua^ erecta, glaberrima ; foliis cuneatis obtusis seu ple- 

 rumque retusis emarginatis obcordatisve ; umbellis trifidis ; bracteis spathulatis seu superioribus 

 orbiculatis basi truncatis ; cornubus involucri setaceis glandulam transversam oequantibus ; 

 capsula dorso leevi ; seminibus facie ventrali 4-punctatis, dorsali laeviusculis. Georgia ',.BoyMn. 

 Louisiana; Hale. Texas; Lindheimer , Wright. Near E. Peplus as is the following species, 

 but distinguished by the capsule and the seeds. 



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Euphorbia Peplidio!^ (nov. spec): annua, erecta, glaberrima, e basi ramosissima; foliis 

 confertis e basi angustata lineari-oblanceolatis obtusis ; umbellis 3-fidis dichotomis, bracteis 

 lanceolatis acutis; cornubus involucri glandulam ipsam sequantibus linearibus obtusis; capsular 

 coccis obtusis non alatis seminibus facie ventrali 2-sulcatis, dorsali punctato-exsculpiis, Sandy 



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soils, western Texas ; WrigJd, {'^o. 1823.) A small plant, 3-4 inches high, much branched 



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from the base, of the habit of. E, exigua. Seeds very similar to those of E, Peplus, 0.6 line 

 long. 



Euphorbia peploides, Nutt. in Trans. Amtr. Phil. Soc. {n. ser.) 5, j). 172, non Gouan. E, 

 longicruris, Scheele in Linncea, 22, p. 152. Western Texas; Wright, (No. 1822 ;) Lindheimer, 



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