BRIEFER ARTICLES. 
TES: 
THE TREE OPUNTIAS OF THE UNITED STA 
oe i the 
THREE species and two varieties of the cy page wage and 
United States may very properly be termed as jay wae 
varieties here designated are O. fulgida Engelm., ay (Engelm), oo 
(Schott) Coult., O. versicolor Engelm., O. spinosio 
O. spinosior neomexicana, var. nov.? t and 
a fulgida is a well-marked species with eget Repee es 
well defined. There is little danger of mistaking thi fa Sulgida 
others when it is once known. The specific sivinien ‘his species 
ar substantially as given by Dr. Engelmann.°? Alt st Bic cues 
has been found as far north as southern Nevada,‘within t < outh of 
the United States it is confined almost entirely es pevie” reaches 
the Colorado plateau.’ It isa plant of the plains and ral pede 
its greatest development on the mesas about Tucson, at a o 
spinosior (Engelm.) (O. Whipple’ spinosior Engelm. Syn. Cact. 307- 
) ] h h k i ar k bro wn 
i rested, ele- 
{2° in diameter, the short, broad, prominent tubercles slightly c , 
Vated 3 to 6™™ ang from 8 to : ica ies 
a few short light-brown bristles at upper margin: spines § to I saa cies leas 
‘© $0 on older joints, 5 to 1 5™™ long, the interior ones occasio 
sheathed, reddi 
rple, 5 to 
ish-brown, the sheaths white and glistening: the flower purp 
: t 25 
spherical, 3.5 long and 2.5™ in diameter, ison: eg d, 
» fleshy, with acid flavor, yellow: seeds regular, smooth, 4 
issure, 
looser sheathed : 
as the species : tubercles longer : spines more numerous and loo 
flowe 
frequently tinted with red. 
> Cactaces: Mex. Bound. 
‘Contributions from U.S. National Herbarium 37448. 
5 
€n and Forest g: 324 
1898] 
T19 
