50 
low shrub, 6-18 inches high; joints 1-2} inches long; tubercles 
4—5 lines long; spines not over an inch in length. Flower appar- 
ently yellow, about 14 inches in diameter and somewhat persistent on 
the fruit. Fruit very shallow, saucer-shaped, with few large seeds. 
Var. 8. is 4 or 5 feet high ; joints 8— 10 inches long; interior spines 
1-12 inches long. Fruit globose or even ovate, with 25 pulvilli. 
Seeds the same in both. 
37. O. SERPENTINA, E. in Sill. Journ. 1852: erectiuscula seu sub- 
prostrata; articulis elongatis cylindricis; tuberculis ovatis; aculeis 
7-9 albido- seu rufido-vaginatis; flore flavo extus rubello; bacca 
subhemisphzerica late et profunde umbilicata villosa aculeatissima. 
Near the sea-coast about San Diego, California. — Sometimes 4-5 
feet high, but often prostrate ; joints 6-12 inches long; spines less 
than one inch long. Flower cup-shaped, 1} inch wide. Fruit ap- 
parently like that of the last species, but “‘ long woolly” and with 
fewer pulvilli, also often crowned with the persistent flower. Seed 
unknown ; said to be large. — Closely allied to the foregoing species. 
Can this be Nuttall’s Cactus Californicus (Cereus, Torr. §& Gr. Fl.), 
with cylindric branches, yellow flower, and spiny fruit ? 
t+ Decidue: arborescentes: articuli tumidi, perfragiles: tubercula 
depressa : flores purpurei: bacce szpissime steriles, proliferze. 
38. O. protiFERA, E.1.c.: ramis divaricatis; articulis ovatis seu 
ovato-cylindricis perviridibus versus ramorum apicem congestis ; tu- 
berculis obovato-oblongis prominulis ; aculeis 8— 10 obscuris strami- 
neo- seu rufo-vaginatis, singulo centrali, ceteris patulis ; flore rubro; 
bacca ovata aculeolata plerumque sterili prolifera. 
On arid hills about San Diego, California, forming extensive thick- 
ets. — Stems 2 —4, and sometimes even 6 — 7, inches in diameter, 3— 
10 feet high ; joints 3-6 inches long and 14-2 in diameter ; tuber- 
cles about 6 lines long; spines 6-14 lines long, the lower ones 
shorter. Flowers red, salver-form, 14 inches in diameter. 
39. O. Futerpa, E. in B. C. R.: ramis divaricatis ; articulis ovatis 
seu ovato-cylindricis glaucescentibus versus ramorum apicem conges- 
tis ; tuberculis ovato-oblongis prominulis ; aculeis 5-9 subqualibus 
laxe vaginatis undique stellato-porrectis ; flore purpureo parvo ; bac- 
ca ovata inermi vix tuberculata ; seminibus parvis rostratis. 
Mountains of Western Sonora: fi. July and August. — Plant 5-12 
feet high ; joints 3-8 inches long ; tubercles rather elongated, 6-7 
