188 UNITED STATES AND MEXICAN BOUNDARY. 



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patula seu decumbens ; caule patenter piloso ; foliis e basi 



valde obliquo obtusiuscula seu subcordata oblongis s^pe falcatis obtusis argute j;rosseque 

 serratis^ subtus pilosis ; stipulis lanceolatis laciniatis ; glomerulis lateralibus appendicibus 

 angiistis integris seu crenulatis ; stylis ovario glabro brevioribus patulis ad basis fere bifidis : 



eeminibus ovatis la3vibus costato-angulatis. Wester 



(No. 658, 1843 



throughout the warmer countries around the whole globe. 



Euphorbia pilulifeka, Linn. /9 discolor : diffusa ; foliis e basi valde obliqua ovatis subrhom- 

 boideis acutiusculus serratis, purpureo-maculatis, stipulis subulatis, capsula parvula pilosa, 

 seminibus minutis ovatis acutis undulato-tuberculatis. Sonora ; Thurher. Wright^ No. 1842^ 

 in part. Mr. Blodgett found it in Florida. Stems ^-1 foot long. Leaves 1-1^ inch long; 

 differs in shape and color of leaves from the usual forms of E, pilulifera ; hair of the stem as 

 in all forms of this species yellow and jointed ; involucre only \ line long ; heads 3-4 lines in 

 diameter ; seed scarcely more than \ line long. 



Euphorbia capitellata (nov. spec.) : annua^ erectiuscula seu demum diffusa ; caulibus elonga- 

 tis puberulis ; foliis e basi valde oblic[ua oblongo linearibus subnudis argute serrulatis mucronatis ; 

 stipulis lanceolatis laceris; glomerulis densifloris terminalibus fere aphyllis; involucri glandulis 

 longius stipitatisj appendiculis orbiculatis s. late obovatis integris ; stylis ovario hirto longio- 

 ribus ad medium bifidis; stigmatibus filiformibus divaricatis ; capsula puberula ; seminibus 

 ovatis acutatis angulatis rugoso-tuberculatis. Valleys at San Bernardino, Sonora ; Wright^ 

 (No. 1,849.) Stems 6-10 inches long; leaves 6-8 lines long, 2 lines wide ; heads white, showy, 

 4-6 lines in diameter. 



Euphorbia PYCNANTHEMA (nov. spec.) : perennis, erecto patula, canescente-pubescens ; foliis e 

 basi lata obliqua cordata ovatis s. oblongis obtusiusculis sa3pe mucronulatis integris s. subserru- 

 latis, scabris ; stipulis lanceolatis fissis ; glomerulis terminalibus multifloris quasi involucratis ; 

 involucris pilosulis (priraariis) late orbiculato-appendiculatis seu (secundariis) subnudis ; stylis 

 fere ad basis fissis patulis ; stigmatibus divaricatis clavellatis ; capsula subglobosa pubescente ; 

 seminibus acute angulatis transverse rugulosis punctatisque. Mountain sides near Lake Santa 

 Maria, Chihuahua; Wright. Numerous stems 6 inches high, from a thick ligneous root; leaves 

 4-5 lines long. General appearance of a small labiate plant with terminal involucrate heads, 

 similar in many respects to the last, but more erect, more hairy, leaves shorter. Remarkable 

 for the different involucres on the same head, reminding one of Hydrangea or some Umbellifera. 



Euphorbia lata. E. dilatata, Torr. & Gray^ Bot. Pope's Rep. p. 19 ; non Hochst. in Richard. 



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and 1844, Wright. No. 796 and 804, Fendler.) Stems 4-6 inches long. Leaves 3-5 lines 

 long, 1-3 lines broad, sharply and coarsely serrate ; seeds larger than in all the foregoing 

 species, 0,8 line long, remarkably angled. 



Euphorbia villifera, Scheele in Linncea 22, p. 153. Western Texas ; Berlandier^ 2084 ; 

 Lindheimer^ 530 ; Wright^ Thurher. In various parts of Mexico ; Gregg. Eoot annual, stems / 



erect, often a foot high, 



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Euphorbia hypericifolia, Linn. Sp. 1, p. 454. New Mexico; Wright. (No. 1842 in part ) 

 Chihuahua ; Thurher. The true Linneean plant probably comes from the West Indies and 

 other tropical countries, and has also been sent from Florida by Dr. Chapman. It is distin- 

 guished by smaller anthodia, generally disposed in denser clusters, smaller capsules and smaller 

 paler seeds. The common North American form, which has also been collected abundantly 

 along the boundary, has larger and more scattered anthodia, larger capsules and larger blackish 

 seeds, and may be distinguished as var. communis^ as it seems to be the more common form 



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