40 
sepe 2-3 minoribus; stigmatibus 8; bacca obovata; seminibus un- 
dulato-marginatis majusculis. 
Var. 8. MONTANA: subinermis ;, stramineo-setosa. 
Along the Canadian River east of the Llano Estacado, and on that 
plain. Var. 8. near Albuquerque. — Joints 21-3 inches in diameter, 
in 8. larger; longer spines 1—2 inches long. . Fruit short, pulpy, 
sweet. Seed 2} lines in diameter, with a very sharp irregularly wavy 
or twisted border. — The var. 8. seems to unite the common O. Rafi- 
nesquii with this form. 
O. stENocuILa, E. & B.1.c.: prostrata; articulis obovatis ; pulvil- 
lis remotis stramineo-setosis, superioribus solum armatis; aculeis sin- 
. gulis albidis patulis, 1-2 minoribus deflexis seepe adjectis ; bacca obo- 
vata clavata; seminibus crassis anguste marginatis. 
Zuni, Western New Mexico. — Joints 4 inches long and 3 wide ; 
spines 1-1} inches long. Fruit green or pale red, very juicy, 14 or 
sometimes even 24 inches long. Seeds quite peculiar, regular, much 
thicker in proportion than those of most other Opuntia, and with a 
very narrow edge. — Another form, with smaller and rounder joints, 
more spines, smaller fruit, but similar seeds, was found in the same 
neighborhood. 
All the forms described above have fibrous roots. The following 
are principally characterized by their bulbous or tuberous roots, but 
can hardly be otherwise distinguished from the forms already de- 
scribed. Both are found westward of the range of O. Rafinesquii 
proper, and may be considered as subspecies, the peculiarities of 
which are readily propagated by seeds. 
O. macroruiza, E. in Pl. Lindh, part 1: prostrata, seepe adscen- 
dens, radicibus tuberosis; articulis obovato-orbiculatis perviridibus ; 
‘pulvillis subremotis rufo-setosis, superioribus solum armatis; aculeis 
singulis validis seepe variegatis patulis, 1-2 gracilioribus deflexis sub- 
inde additis ; alabastro acuminato ; petalis circiter 8 sulphureis basi 
miniatis ; stigmatibus 53; bacca obovata basi clavata, umbilico lato; 
seminibus subregularibus compressis minoribus. 
Sterile, rocky places on the Upper Guadalupe River, in Texas: fl. 
May and June. — Roots in young specimens fusiform, in old ones 
enlarged to fleshy tubers, sometimes 2 or 3 inches in diameter. 
Joints 24-8 inches long, the leaves and bristles the same as in O. 
Rafinesquit. Flowers 3 inches in diameter. Fruit green or pale 
purple, smaller and sweeter than that of O. Rafinesquit. 
