Euphorbia. 



EUPHORBIACE.E. 



the end of each branch, hoary-])uhescent, campanulate, nearly a line long, on short 

 pedicels ; the incurved lobes timbriate-pectinate with densely pubescent teetii and the 

 3 to 5 thin glands with a broad similarly timbriate margin clei"t on the inner side : 

 styles undivided : capsule tinely pubescent, obtusely 3dobed, 2 lines long : seeds didl 

 white, quadrate-oblong and compressed, obtusely angled, coarsely and rather faintly 

 wrinkled; caruncle conspicuous. — Bot. Sulph. 51 ; Boiss. 1. c. 73. 



Magdalena Bay, Lower CaUfornia (Hinds) ; Sonora ( Wright) ; Rig Canon of Tantillas Moun- 

 tains, and Camp Grant, Arizona, Palmer. The description is drawn from the latter si)ecimens. 

 The original is described as having the leaves sharply and remotely dentat(! or rarely entire, the 

 xipper ones whitish at base, the involucres 3 to 5 on each Inanch, nearly sessile, and the (imma- 

 ture) seeds densely covered with depressed tubercles. 



§ 4. Glands flattened or convex: stipules none: involucres in dlchotomous or often 

 umhellate cymes, 4 - 5-lobed. — Tithymalus, Boiss. 



* Glands rounded and discoid, entire. 



10. E. dictyosperma, Fisch. & Mey. Annual, glabrous, usually erect, ' to 

 1 1 feet high : stem simple below or often branching from the base, dichotoniously 

 branched above : cauline leaves scattered, oblong- to obovate-spatulate, obtuse and 

 obtusely serrulate, often retuse, | to H inches long ; on the branches opposite, 

 broadly ovate to oblong, the floral ones round-ovate, subcordate, mucronate, 2 to 6 

 lines long : rays usually 3, 2 to 4 times forked : involucres and glands small : styles 

 bihd or parted : capsule with rounded and warty lobes, 1 to n lines long : se^ds 

 subglobose, delicately net-veined, dark-colored, with thin flattened caruncle. — 

 Boiss. 1. c. 135. E. Arkansana, Engelm. & Gray, PL Lindh. 53. 



From Oregon to Santa Barbara County (Brewer) and Mono Pass (Bolandcr), but more frequent 

 eastward on the plains from Nebraska to Texas and New Mexico. 



* * Glands crescent-shaped, 2-horned or denticulate : leaves entire. 



H— Cauline leaves scattered, ohovate to spatulate : seeds ash-graij, pitted or mottled : 

 capstde smooth. 



11. E. leptocera, Engelm. Annual or sometimes biennial, glabrous, erect or 

 decumbent at the branching base, a foot high : leaves obovate-spatulate, obtuse, 

 often mucronate, | to 1 1 inches long, the upper ones sometimes erose-denticulate ; 

 those on the branches and the floral ones opposite or usually ternate, deltoid or 

 broadly rhombic-ovate, sometimes connate, acute, 3 to 6 or 8 lines broad : branches 

 2 or 3 times dichotornous, the upper nodes much the shorter : involucres turbinate, 

 the oblong lobes nearly entire ; glands large, crescent-shaped, the slender horns 

 sometimes cleft : styles elongated, bifid : capsule 2 lines broad : seeds usually ash- 

 colored, oblong-ovate, conspicuously dark-pitted, nearly \\ lines long, with a promi- 

 nent caruncle. — Pacif. P. Pep. iv. 135; Boiss. 1. c. 143. E. crenulata, Engelm. 

 in Bot. Mex. Bound. 192. 



Nearly throughout the State ; from Ventura County (Ojai, recTcham) to Plumas County, and 

 Oregon, Hall. 



1 2. E. Falmeri, Engelm. ined. Perennial, stout, glabrous, the stem erect, a foot 

 high or more, with a few short lateral branches and umbelliferous above, the 4 

 or 5 rays once or twice dichotomous : leaves ovate, obtuse, shortly petiolate, 6 to 9 

 lines long ; of the inflorescence very broadly rhombic-ovate to subreniform, very 

 obtuse, mostly apiculate : involucres a line long, Avith rounded entire ciliate lobes ; 

 glands shortly stipitate, crenate above and slightly horned : styles short, united at 

 base, bifid to the middle : capsule ovate, 2 lines long: seeds ovate, rugose, 1^ lines 

 long. 



At Talley's Pianch in the Cuyamaca Mountains, Palmer (n. 450, 1875). 



13. E. schizoloba, Engelm. Perennial, glabrous or slightly puberulent above, 

 somewhat glaucous : tlie herbaceous stems erect or decumbent at base, 6 to 10 inches 



