374 
/ 
41. Echinocactus limitus Engelm, MSS, 
Globose and large, 3 dm. or more in diameter: ribs 21, oblique, thick 
and broad (compressed above), slightly interrupted: radial spines 12 to 
16, about 2.5 em, long, upper and lower most prominent, laterals occa- 
sionally somewhat twisted; central spines 4, ashy-red, finely annulate, 
slightly recurved, upper and lower ones flat and broad, 4 to 4..% em. 
long, lateral ones angular and shorter: flowers companulate, purplish- 
brown or dusky, 3.5 to £ em. long and broad: fruit green.—Type, Hitch- 
cock of 1876 in Herb, Mo, Bot. Gard. 
Along the “boundary line south of San Diego, with Agave shavwiti 
and Cereus enoryi.” 
Specimens examined: Boundary line between California and Lower 
California (GM. Hitchcock of 1876): also specimens cultivated at Shaw’s 
Garden in 1876. 
++ a+ ++ Ribs deeply sulcate or tuberculate: spines similar (all flat or all terete) and 
interwoven with those of adjacent clusters (except in No. 49). 
= Tubercles more or less confluent at base: flowers reddish (unless in No. 47). 
42. Echinocactus johnsoni Parry, Bot. King Surv. 117 (1871). 
Oval, 10 to 15 em. high: ribs 17 to 21, low, rounded, tuberculately 
interrupted, close-set, often oblique, densely covered with stoutish 
reddish-gray spines: radial spines 10 to 14, 1.5 to 5 em, long, the 
upperlongest; centrals 4, stouter, recurved, 5.5 to 4 cm. long: flowers 
5 t6 6.5 em. long and wide, from deep-red to pink: seeds reticulate- 
pitted.—T ype, Johnson of 1870 in Herb. Mo, Bot. Gard. 
Near St. George, Washington County, extreme southwestern Utah, 
and extending into southern Nevada (about Vegas Wash, side Coville), 
and doubtless into adjacent California (Inyo County). 
_ Specimens examined: Uran (Johnson of 1870, 1874; Parry of 1870; 
Palmer of 1877). 
Dr. Merriam says that this species is ‘‘eaten by the Paiute Indians, who peel it as 
we would a cucumber.” 
43. Echinocactus johnsoni octocentrus, var. nov. 
Central spines 8, strongly bulbous at base, the upper half red, 
recurved-spreading, 2.0 to 3 cm, long: flowers 5 cm. long and wide, 
pink.—Type, Coville & Funston 278 in Nat. ILlerb. 
Rusting Springs Mountains, lnyo County, California. 
Specimens examined: CALIFORNIA (Coville & Funston 278 of 1891). 
This variety seems to represent the extreme western form of the species. 
44. Echinocactus unguispinus [ngelin. Wisliz. Rep. 27 (1848). 
Depressed-globose, 10 cm. in diameter, 7.5 em, high: ribs 21, tubereu- 
late-interrupted: radial spines about 21, slender, white, recurved, 
interwoven with those of adjacent clusters, the lower ones 12. to 20 
mim. long, the upper ones 24 to 50 mm. long; central spines 5 (rarely 
6), stouter, longer, horny, turned upward, the upper ones 24 to 36 
min. loug, the lowest one very stout, brown-tipped, curved downward, 
