ON THE GENUS EUPHORBIA IN DECANDOLLE’S PRODROMUS. 44] 
esmig by Dr. Bigelow by having unequal glands to the involucrum, those behind being much longer than those 
n front ; and especially by their petaloid rose-colored appendages, The seeds are not opaque, as Prof. Torrey says, 
Sak codtial gray. 
EvrHorBIa Potycarpa, Benth. Bot, Sulph., p. 49; Engelm. in Mex. B. Rep. II., ined. This is one of the most 
variable species of North America, if I understand it correctly. A form with narrow ptt pubescent leaves and very 
small appendages was collected with the last, and in the Purple Hills, forming dense mats on the sand of dry arroyos. 
Another, and the most showy form — the same that was found by Mr. Schott and Dr. Parry at San Diego, and of 
which a specimen from the same locality is in Dr. Hooker’s herbarium, labelled by Nuttall EF. ocellata, — was collected 
at Laguna, and was seen from Los Angeles to the Colorado. This showy form has almost smooth uniform leaves, and 
very large white appendages to the dark glands. 
EvpHorsia serinosa, Lngelm. in P. R. Rep., vol. 5, p. 364. Gravelly beds of arroyos at Purple Hills. Also in 
flower in January, and probably the whole year round. Nearly allied to the last, with the same rough pubescence, 
but readily distinguished, not only by the deep laciniate appendages, but also by the almost naked inside of the invo- 
ueres. I find them in Dr. Newberry’s specimens aes triandrous, as Prof. Torrey has already noticed in the 
original specimen sent Rein Fort Yuma eck Major Thomas 
EvupHorsia (TITHYMALUS?) LURIDA, n. sp.: e basi perennante multicaulis, glaberrima, junior tota rubra 
Inrida ; foliis oblanceolatis acutis basi ceuditi subsessilibus patulis ; umbellae quinquifide bracteis, cuspidatis, inferi- 
oribus obovatis seu oblanceolatis, superioribus suborbiculatis; involucri parvi intus pubescentis glandulis transversis 
crenatis lobis ovatis membranaceis pubescentibus ; stylis ovario levim ulto brevioribus vix basi connatis bilobis. Cam 
81-82, San Francisco Mountain ; commencing to bloom at the end of April. I introduce this w 
species with a good deal of hesitation, as the specimens are scarcely enough advanced ; but, though the fruit is as [27] 
yet unknown, the plant seems to be well distinguished from any of the known North American or Mexican 
species. From the very similar E. esuleformis and its allies it differs by the absence of horns on the glands, and by the 
very short styles. 
Stems of the young specimens just coming into flower are six inches high, with the leaves brownish red ; upper 
side of leaves greenish red; leaves 5-8 lines long, and 1}-2 lines wide; ineoleny 1 line long ; linear Seisota: of the 
male flowers numerous, hairy. So that it is more nearly allied with Tithymalus than with Esula. 
Evupnorsta (Esvxa?) rxcisa, 2. sp. [E. schizoloba, Eng. Proc. Am. Acad. V. 173]: perennis, e basi ramosa erecta 
vel ascendens, glaberrima, glaucescens ; foliis brevibus ovatis brevissime cuspidatis in petiolum brevem attenuatis ; 
umbellze trifidee bracteis cuspidatis, inferioribus ncn superioribus basi truncata transversis ; involucri majusculi 
intus subnudi glandulis stipitatis transv catis erenatis seu irregulariter incisis nec cornutis ; lobis involucri 
apice truncatis glanduloso-incrassatis paihiila sisneclinitl seu irregulariter bilobis; stylis ovario leavi longe exserto 
rane basi connatis bilobis. Camp 62, Long Valley. Stems 8-12 inches we hak; leaves 5-7 lines long and 3 or 4 
es wide ; involucrum about two lines long, aul, with the conspicuous glands, more than that in diameter. Flower, 
it end of March ; very nearly allied to Euphorbia montana, Engelm. in Bot. Mex. B. Expedition, with similar habits, 
leaves, umbels, but amply distinguished from this and all other peploid Euphorbias by the large involucrum, the 
absence of horns, and the incised nearly naked lobes. In all the allied species the lobes are membranaceous, ovate, 
obtuse, and on the inside villous. The bracts at the base of the male flowers are almost wanting, and the few occas- 
Siig found are nearly naked, while in most species they are pubescent or gosnee The styles, much longer than the 
ary, are united at the lower third and bifid at the upper third. Stigmas clavate; fruit and seed unknown. 
sae is too nearly allied to some of our peploid Esule to be separated from as though the glands are hornless. 
IV. ON THE GENUS EUPHORBIA IN DECANDOLLE’S PRODROMUS. 
From THE AMERICAN JOURNAL OF Screnck, 2D Ser., Vor. XXXIV. 1862. 
AFTER an interval of five years a continuation of the Prodromus, constituting a part of the [288] 
15th volume, has just made its appearance, containing a monograph of the suborder Huphorbiee 
by E. Boissier. The celebrated author has in this work described and arranged with admirable care, 
conscientiousness, and lucidity the heretofore almost unapproachable mass of species of one of the 
most numerous genera of plants spread over the whole globe. He has, with great propriety, retained 
this eminently natural genus as Linnzus constituted it, retaining as subdivisions some of the numer- 
ous genera into which former authors from Haworth to Klotzsch and Garcke have sought to divide it. 
56 
