X. 
PAPERS ON EUPHORBIACESA. 
I. EUPHORBIACEX OF THE MEXICAN BOUNDARY. 
From Report on THE BounDAry Survey, Vot. II., Parr 2, Borany, By Joun Torrey, 1859. 
§ I. ANISOPHYLLUM. 
EUPHORBIA PETALOIDEA : ECE foliis oblongis oblongo-linearibus linearibusve retusis mu- [185] 
cronatis; glandulis albo-appendiculatis ; seminibus levibus. 
a. NIcoLueti!: foliis stylisque brevioribus; sisthoalle cymulosis ; ener ovatis. 
8. INTERMEDIA : foliis angustioribus ; style longioribus ; anthodiis cymulosis. 
. Nurrauuit: foliis linearibus; anthodiis cuit ; appendiculis aaiiida stylis elongatis, seminibus sub- 
globosis. £. arenaria, mine? Pl. Arkans. p. 171, n BK. 
6. FLAGELLIFORMIs : priori similis, sed sypendidati minimi, styli breves. Of these varieties a. and 8. have not 
been found within the pes explored by the Boundary orm but they probably occur there. The var. y. is 
common in Texas. Wright’s 1826, belongs to var. 8., a New Mexican form 
EUPHORBIA SERPENS, HBK. E. herniarioides, Nutt. 1. ¢. p. 171. ie the southwestern parts of North [186] 
America (abundant on the Mexican bou ndary line) and — Central and South America, but not in the 
eastern States. #. microphylla, Roth, from India, is the same plan 
EvUPHORBIA REVOLUTA, n. sp.: erecto-patula; foliis ae ae obtusis basi subequalibus, stipulis 
setaceis ; anthodiis alaribus; glandulis anguste appendiculatis ; — urvis apice bifidis; capsula acute angulata 
seminibus angustis ae angulatis transverse pag (Gravel y hills near Rock Cre ae Bigelow. On the Rio 
Grande ; Wright, No. 1830.) New Mexico; Fendler, No. 789. 5 ery slender, 4-5 inches — leaves 6-10 lines 
long and $ line wide. ae like a small ‘doses . “actin but styles and seeds very diffe 
EvUPHORBIA POLYCARPA, Benth. Bot. Sulph. p. 50. Dry soils near San Diego, California ; oe Schott. Banks 
of the Gila; Major Emory. Sonora; Wright, No. 1854. This is a very variable plant, if all the forms which I refer 
to here really belong to it. Seeds smooth or undulate, appendages none, or small or large ; plant smooth or pu 
(and then always with short patulous hairs). Collected by all the botanists from the Upper Gila to San Diego. The 
only species of the section stra sec come which, so far as I know, has both smooth and pubescent forms, with the 
exception of EH. hypericifolia 
Evpnorsia Armonica, n. sp.: erecto-patula ; foliis e basi lata subsequali ovatis obtusis pilosis ; stipulis incon- 
spicuis; anthodiis alaribus longius vaiiteoalatios appendicibus glandula purpurea multo majoribus obovatis tu ubo 
turbinato postice fisso breviortbuss stylis erectis ai medium bifidis ovario puberulo longioribus, stigmatibus filiformi- 
ph capsula pilosa ; seminibus i Sse cancenerdis angnlos acutos crenulatis. Sierra Yanos, Sonora, July; Schott. 
tems 4-5 inches high ; leaves 3-4 lines long, 2}~3 lines wide. Seed very small, involucrum with the appendage 14 
line in diameter. 
EUPHORBIA PEDICULIFERA, 7. sp. ? mbens, cinereo-pubescens ; foliis ovatis obtusiusculis ; stipulis e basi 
lata bias glomerulis parvifloris in cust alternis terminalibus ; involucris hemisphericis ; glandulis magnis ; 
appendicibus transversis crenatis ; stylis patulis pubescentibus ad basin fere bifidis ; stigmatibus divaricatis ; ign 
acute angulata pubescente, seminibus compressis angulatis sulcis 4 profundis transverse incisis. Sonora; Wright 
(No. 1848), Schott. Spreading 6-12 inches. Leaves 34 lines long, oblique. Involucrum large. Seeds 0.7 line long, 
deeply 5-lobed, similar to some insec - 
