BOTANY. 27 
but though the fruit is as yet unknown, the plant seems to be well distinguished from any of 
the known North American or Mexican species. From the very similar EF. 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. Six inches high, with the leaves 
brownish red; upper side of leaves greenish red; leaves 5-8 lines long, and 1}~-2 lines 
wide; involucre 1 line long; linear bracts of the male flowers numerous, hairy, so that it is 
more nearly allied with Tithymalus than with Esula. 
EupHorsia (EsvLa?) INCISA, nov. spec.: perennis e basi ramosa erecta ascenderisve glaberrima 
glaucescens; foliis brevibus ovatis brevissimi cuspidatis in petiolum brevem attenuatis; 
umbelle trifide bractis cuspidatis inferioribus rhormbeis, superioribus basi truncata transversis; 
involucri majusculi intus subnudi glandulis stipitatis transversis truncatis crenatis seu irregu- 
lariter incisis nec cornutis; lobis involucri apice truncatis, glanduloso incrassatis profunde emar- 
ginatis seu irregulariter bilobis stylis ovario levi longe exerto, longioribus basi connatis bilobis. 
Camp 62, Long valley. Stems 8-12 inches high; leaves 5-7 lines long and 3 or 4 lines wide; 
involucrum about two lines long, and, with the conspicuous glands, more than that in diameter; 
flower, end of March; very nearly allied to Euphorbia montana, Engelm. in Bot. Mex. B. Expedi- 
tion, with similar habits, leaves, umbells, 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 occasionally found 
are nearly naked, while in most species they are pubescent or villous. The styles, much longer 
than the ovary, are united at the lower third and biped at the upper third. Stigmas clavate; 
fruit and seed unknown. ‘This species is too nearly allied to some of our peploid swe to be 
separated from them, though the glands are hornless. 
URTICACEA ad 
PARIETORIA DEBILIS, Forst. 9 Fiorip1ana, Weddell, Mon. Urt., p. 316; Torr. Bot. Mex. Bound., 
p. 202. BP. Floridana, Nutt. Rocky arroyos, Colorado Desert; Camp 49; February 22. 
PLATANACEZ. 
Puatanus racemosa, Nutt. Audub. Birds, 1, t. 362, and Sylv. t., p. 47, t. 15. San Luis 
Obispo, California; November. | 
. SAUSURACE®. 
ANEMOPSIS CALIFORNICA, Nutt. Hook. & Arn. Bot. Beech., p. 390, t. 92. Alluvial lands; San 
Diego and Los Angelos; November 9, in fruit. Rio Grande; May, in flower. 
SALICACE A. 
Saurx. Several undetermined species. 
Porvnus montuirera, Ait. Miche. Sylva. 1, p. 116, ¢. 96, 7. 2. Banks of Colorado every- 
where; Mojave valley; in flower, February 15. 
Porvutus TrRemuLoreEs, Miche. Fl. 2, p. 143, Sylv. 1, p. 125, ¢. 99. High table-lands about 
San Francisco mountain. » 
Porvunus ancustiroiia, James, Torr. Ann. Lyc. N. York, 2, p. 249; Nutt. Sylv. 1, p. 52, t. 
16. Caiion of Cascade river. 
JUGLANDACEZ. 
JuGLANS RuPESTRIS, Engelm. Torr. Bot. Sitgreaves’s Rep., p. 171, #. 15. J. pyriformis, Liebm. 
_Vidensk. Meddel. Kijobenh. for 1850, p. 80? Banks of Cedar creek, west of San Francisco 
mountain. 
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